China Largest Manufacturer factory sales 5-Aminosalicylic acid CAS 89-57-6 CAS NO.89-57-6

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5-Aminosalicylic acid Basic information Overview Indication Mode of action Pharmacokinetics Adverse reactions and toxicity References Product Name: 5-Aminosalicylic acid Synonyms: 5-Aminosalicylic acid, 98.5%, IKK inhibitor;2-HYDROXY-5-AMINOBENZOIC ACID;3-Carboxy-4-hydroxyaniline;5-AMINO-2-HYDROXYBENZOIC ACID;5-AMINOSALICYLIC ACID;5-ASA;5-AS;rowasa CAS: 89-57-6 MF: C7H7NO3 MW: 153.14 EINECS: 201-919-1 Product Categories: API;CITANEST;Pharmaceuticals;Carboxylic Acids;Aromatics;Aromatics, Metabolites & Impurities, Pharmaceuticals, Intermediates & Fine Chemicals;Carboxylic Acids;Phenyls & Phenyl-Het;Organic acids;Various Metabolites and Impurities;Fendosal;Intermediates & Fine Chemicals;Phenyls & Phenyl-Het;Fluorescent;FINE Chemical & INTERMEDIATES;Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts;Metabolites & Impurities Mol File: 89-57-6.mol   5-Aminosalicylic acid Chemical Properties Melting point  275-280 °C (dec.) (lit.) Boiling point  276.03°C (rough estimate) density  1.3585 (rough estimate) refractive index  1.5500 (estimate) Fp  279-281°C storage temp.  2-8°C solubility  Soluble in dimethyl sulfoxide. form  tablets pka 2.74, 5.84(at 25℃) color  off-white to gray PH 4.0-4.1 (0.8g/l, H2O, 20℃) PH Range Non-B uorescence (3.1) to light green B uorescence (4.4) Water Solubility  <0.1 g/100 mL at 21 ºC Decomposition  279-281 ºC Merck  14,5904 BRN  2090421 Stability: Stable. Incompatible with acids, acid anhydrides, acid chlorides, chloroformates, strong oxidizing agents. Major Application Detergent, hair dyes, prevention of colorectal cancer, treating inflammatory bowel disease, autoimmune disorders, gastrointestinal inflammation, chemokine-mediated diseases, mucosal tissue disorder, sleep disorders, rectoanal tenesmus, ulcerative colitis InChIKey KBOPZPXVLCULAV-UHFFFAOYSA-N CAS DataBase Reference 89-57-6(CAS DataBase Reference) NIST Chemistry Reference Mesalamine(89-57-6) EPA Substance Registry System Benzoic acid, 5-amino-2-hydroxy- (89-57-6)   Safety Information Hazard Codes  Xi Risk Statements  36/37/38-52/53 Safety Statements  26-36-24/25-61-37/39 WGK Germany  2 RTECS  VO1400000 F  8-10-23 Autoignition Temperature 280 °C Hazard Note  Irritant TSCA  Yes HazardClass  IRRITANT HS Code  29225000 Hazardous Substances Data 89-57-6(Hazardous Substances Data) Toxicity LD50 orally in Rabbit: 2800 mg/kg LD50 dermal Rat > 5000 mg/kg MSDS Information Provider Language 3-Carboxy-4-hydroxyaniline English SigmaAldrich English ACROS English ALFA English   5-Aminosalicylic acid Usage And Synthesis Overview Mesalazine is an anti-inflammatory agent, structurally related to the salicylates, which is active in inflammatory bowel disease. It is considered to be the active moiety of sulphasalazine. A study of the therapeutic properties of sulfasalazine and its constituents[mesalazine (5-amino salicylic acid, 5-ASA) and sulfapyridine] indicated that mesalazine is the therapeutically active component, while sulfapyridine acts as an inert carrier molecule to facilitate delivery to the colon.[2] This discovery, coupled with the implication of sulfapyridine in most of the adverse events associated with sulfasalazine treatment,[3] led to the development of Mesalazine as a pure therapeutic entity. Mesalazine (fig. 1) is believed to exert its effects via topical actions in the gut lumen. However, orally administered unconjugated mesalazine is extensively absorbed from the proximal small bowel,[4] and alternative oral dosage formulations have been developed to facilitate the delivery of mesalazine to more distal sites of inflammation. These include microgranules of mesalazine coated with a semipermeable ethylcellulose membrane (Pentasa®), mesalazine encased within a pH-dependent acrylic resin (pH-dependent delayed-release preparations: Salofalk®, Claversal®, Mesasal®, Asacol®), or conjugation of mesalazine via an azo bond to an inert carrier (balsalazide) or to another mesalazine molecule (olsalazine). In each case the properties of the delivery system dictate the site of mesalazine release. Figure 1 the chemical structure of Mesalazine Indication It is used for the treatment of active ulcerative proctitis. Mode of action The pathogenesis of IBD and hence the mechanism by which mesalazine exerts its therapeutic effects in this disease remain elusive. However, lipid mediators[leukotrienes (LT), prostaglandins (PG), platelet-activating factor (PAF)], cytokines[including interleukins (IL), interferon-(IFN)γ and tumour necrosis factor-(TNF)α] and reactive oxygen species have been implicated in the nonspecific inflammation and tissue damage characteristic of IBD.[5-7] The modulation of these molecules by mesalazine may underlie the therapeutic effects of the drug.[8-11] Numerous in vitro studies have investigated the effects of mesalazine on inflammatory processes in colonic epithelial cell lines or biopsy specimens from patients with active ulcerative colitis or with normal colons. Mesalazine also appears to reduce in vitro levels of LTC4, 5-hydroxyeicosatetraenoic acid (HETE), 11-, 12-, 15-HETE, PGD2 and platelet-activating factor. In addition to inhibiting interferon (IFN)-γ binding, mesalazine reduced IFNγ-induced cell permeability and expression of the HLA-DR product of the major histocompatibility complex in colonic epithelial cell lines. Recent evidence suggests that mesalazine reverses the antiproliferative effects of tumour necrosis factor-(TNF)α and inhibits TNFα signalling events in intestinal cells. Mesalazine may also reduce interleukin (IL)-1/1β and IL-2 production. A variety of data from experimental work, animal studies and preliminary clinical trials strongly suggest that mesalazine may have antineoplastic and potentially prophylactic (chemo-preventive) properties, which are comparable with those found with aspirin and other NSAIDs. Mesalazine shares similar molecular targets, interfering with inflammation, proliferation and ⁄ or apoptosis, as aspirin and other NSAIDs. This can be explained by the close molecular similarity of mesalazine and aspirin, in which the former differs only in structure by the presence of an amino group at position 5 of the benzene ring. Recent experimental and preliminary clinical work has demonstrated that mesalazine may have in vitro and in vivo inhibitory properties comparable to other NSAIDs.[12-14] Reversible inhibition of COX-1 and COX-2, NF-kB activation, MAP kinases and Bcl-2 by mesalazine, was found in experiments using different cell systems including lymphocytes, polymorphonuclear leucocytes (PMNLs) and cultures from normal and neoplastic cell lines of animal and human origin.[15] In contrast to aspirin, which was shown to inhibit COX irreversibly, mesalazine (and other NSAIDs) inhibit COX and other steps (e.g. Bcl-2) reversibly. The molecular details for the majority of these reactions are only partly known, but recent work has shed light on some of these. Thus, inhibition of NF-kB activation is most likely to be mediated by inhibition of IkB degradation, the inhibitory unit of the NF-kB complex. It is worth noting that mesalazine has rather unspecific COX inhibitory properties with no preference for COX-2. Pharmacokinetics After a single oral dose of prolonged-release mesalazine 250mg to volunteers, the median lag time (tlag) to the first detectable plasma concentration of mesalazine was 45 minutes (range 15 to 150). A maximum plasma concentration (Cmax) of 0.6 μmol/L (range 0.4 to 1.4) was recorded 240 minutes (tmax; 90 to 300) after dose administration. Corresponding values for acetyl mesalazine were: tlag 22 minutes (15 to 45), Cmax 2.9 μmol/L (1.6 to 3.4) and tmax 105 minutes (60 to 300).[16] The plasma concentration-time profile following a single oral dose of prolonged-release mesalazine 1g to healthy volunteers was consistent with a continuous release of drug throughout the gastrointestinal tract. Plasma concentrations peaked at 0.53 mg/L 4 hours after administration, declined rapidly to 0.03 mg/L at 12 hours, then remained fairly constant over the next 24 hours before resuming the final decline, becoming undetectable 60 hours after administration. The area under the plasma concentrationtime curve (AUC) for mesalazine was 4.37-mg/L • h. Little is known about the distribution of prolonged-release mesalazine. In 9 pregnant women with IBD who were receiving prolonged-release mesalazine 0.5 to 3 g/day, low concentrations (approximate values from graph) of mesalazine and acetylmesalazine were measured in maternal (≤0.5 and ≤7.5 μmol/L) and fetal plasma (≤0.25 and ≤18 μmol/L). In 2 patients, low concentrations of mesalazine were detected in breast milk. Mean acetyl mesalazine concentrations in breast milk were 4.4 to 47.5 μmol/L.[18, 19] Mesalazine is primarily metabolized by acetylation in the gut wall and the liver, forming the therapeutically inert metabolite acetyl mesalazine. Both the parent compound and the metabolite are excreted in the urine.[20] After a single oral administration of prolonged-release mesalazine 0.25g in 6 volunteers, the apparent mean elimination half-life of acetyl mesalazine was 802 minutes (range 608 to 993). Determination of the terminal half-life of mesalazine was not possible because of low plasma concentrations.[16] After oral administration of prolonged-release mesalazine 1.5 to 4 g/day to volunteers, excretion of unchanged mesalazine accounted for 8 to 12% of the daily dose. Total urinary excretion of mesalazine plus acetyl mesalazine was 29 to 53%.[21,22,23] In volunteers, renal clearance of acetyl mesalazine was 12 L/h (201 ml/min) at steady state.[21] In a 7-day study of 15 patients with ulcerative colitis, daily urinary excretion of mesalazine and acetyl mesalazine was higher with prolonged-release mesalazine (1.5 g/day) and pH-dependent delayed-release mesalazine (Asacol ®, 1.2 g/day) than with olsalazine (1 g/day).[17] Adverse reactions and toxicity In an 8-week randomized trial of prolonged release mesalazine 1, 2 and 4 g/day or placebo in patients (n = 314) with ulcerative colitis, 16% of patients receiving active drug experienced treatment-related adverse events, compared with 22% of patients in the placebo group. No dose-response relationship was observed. In total, 5%, 9% and 7% of patients in the 1, 2 and 4 g/day dosage groups discontinued therapy because of treatment-related or unrelated events, compared with 12% of placebo treated patients. The most common treatment limiting adverse events were diarrhoea, abdominal pain, fever and melaena.[24] In another 16-week study, the most common adverse events considered to be related to prolonged-release mesalazine treatment were nausea and/or vomiting (7.4 vs 3.7% in the placebo group), headache (5.2 vs 3.7%) and abdominal pain (4.3 vs 5.0%).[26] In a 12-month study involving 205 patients with ulcerative colitis, adverse events necessitating withdrawal occurred in 14% and 33% (2% and 6% considered to be treatment-related) of patients receiving prolonged-release mesalazine 4 g/day and placebo, respectively. Treatment-related adverse events (most commonly nausea 2.9%, abdominal pain 1.9% and dyspepsia 1.9%) were experienced in 6.8% of patients receiving prolonged-release mesalazine. In contrast, 11.8% of patients in the placebo group experienced adverse events related to therapy.[25] In a non-comparative study in 467 patients with Crohn’s disease who received prolongedrelease mesalazine at dosages up to 4 g/day for a median of 14 months, 12%of patients discontinued because of treatment-related adverse events, of which the most commonly reported were diarrhoea (4.3%), abdominal pain (3.6%) and dyspepsia (3.1%).[27] References Martin F. Oral 5-aminosalicylic acid preparations in treatment of inflammatory bowel disease: an update. Dig Dis Sci 1987; 32 (12 Suppl.): 57S-63S Azad Khan AK, Piris J, Truelove SC. An experiment ot determine the active therapeutic moiety of sulphasalazine. Lancet 1979; II (8044): 892-5 Schröder H, Price E, Evans DA. Acetylator phenotype and adverse events of sulphasalazine in healthy subjects. Gut 1972; 13 (4): 278-84 Haagen Nielsen O, Bondesen S. Kinetics of 5-aminosalicylic acid after jejunal instillation in man. Br J Clin Pharmacol 1983; 16 (6): 738-40 Ireland A, Jewell DP. Mechanism of action of 5-aminosalicylic acid and its derivatives. Clin Sci 1990; 78: 119-25 Greenfield SM, Punchard NA, Teare JP, et al. Review article: the mode of action of the aminosalicylates in inflammatory bowel disease. Aliment Pharmacol Ther 1993; 7: 369-83 Travis SPL, Jewell DP. Salicylates for ulcerative colitis – their mode of action. Pharmacol Ther 1994; 63: 135-61 Schmidt C, Fels T, Baumeister B, et al. The effect of 5aminosalicylate and para-aminosalicylate on the synthesis of prostaglandin E2 and leukotriene B4 in isolated colonic mucosal cells. Curr Med Res Opin 1996; 13 (7): 417-25 Capasso F, Tavares IA, BennettA. Release of platelet-activating factor (PAF) from human colon mucosa and its inhibition by 5-aminosalicylic acid. Drugs Exp Clin Res 1991; 17: 351-3 Rachmilewitz D, Karmeli F, Schwartz LW, et al. Effect of aminophenols (5-ASA and 4-ASA) on colonic interleukin-1 generation. Gut 1992; 33: 929-32 Di Paolo MC, Merrett MN, Crotty B, et al. 5-Aminosalicylic acid inhibits the impaired epithelial barrier function induced by gamma interferon. Gut 1996; 38: 115-9 Vainio H, Morgan G. Non-steroidal anti-inflammatory drugs and the chemoprevention of gastrointestinal cancers. Scand J Gastroenterol 1998; 33: 785–9. Bus PJ, Nagtegaal ID, Verspaget HW, et al. Mesalazine-induced apoptosis of colorectal cancer: on the verge of a new chemopreventive era Aliment Pharmacol Ther 1999; 13: 1397–402. Reinacher-Schick A, Seidensticker F, Petrasch S, et al. Mesalazine changes apoptosis and proliferation in normal mucosa of patients with sporadic polyps of the large bowel. Endoscopy 2000; 32: 245–54. Egan LJ, Mays DC, Huntoon MP, et al. Inhibition of interleukin-1-stimulated NF-jB RelA ⁄ p65 phosphorylation by mesalazine is accompanied by decreased transcriptional activity. J Biol Chem 1999; 274: 26448–53. Bondesen S, Hegnhoj J, Larsen F, et al. Pharmacokinetics of 5-aminosalicylic acid in man following administration of intravenous bolus and Per Os slow-release formulation. Dig Dis Sci 1991; 36: 1735-40 Daneshmend TK, Hendrickse M, Salzmann M, et al. Does systemic absorption of 5-aminosalicylic acid from olsalazine (Dipentum®) and mesalazine (Asacol® and Pentasa®) differ significantly in ulcerative colitis [abstract]. Gut 1994; 35 Suppl. 4: 233 Staerk-Laursen L, Stokholm M, Bukhave K, et al. Disposition of 5-aminosalicylic acid by olsalazine and three mesalazine preparations in patients with ulcerative colitis: comparison of intraluminal colonic concentrations, serum values, and urinary excretion. Gut 1990; 31: 1271-6 Christensen LA, Rasmussen SN, Hansen SH. Disposition of 5-aminosalicylic acid and N-acetyl-5-aminosalicylic acid in fetal and maternal body fluids during treatment with different 5-aminosalicylic acid preparations. Acta Obstet Gynecol Scand 1994; 74: 399-402 Lauritsen K, Laursen LS, Rask-Madsen J. Clinical pharmacokinetics of drugs used in the treatment of gastrointestinal diseases (Part II). Clin Pharmacokinet 1990; 19: 94-125 Rasmussen SN, Bondesen S, Hvidberg EF, et al. 5-Aminosalicylic acid in a slow-release prepararation: bioavailability, plasma level, and excretion in humans. Gastroenterolo 1982; 83: 1062-70 Christensen LA, Fallingborg J, Abildgaard K, et al. Topical and systemic availability of 5-amino-salicylate: comparisons of three controlled release preparations in man. Aliment Pharmacol Ther 1990; 4: 523-33 Christensen LA, Fallingborg J, Jacobsen BA, et al. Comparative bioavailability of 5-aminosalicylic acid from a controlled release preparation and an azo-bond preparation. Aliment Pharmacol Ther 1994; 8: 289-94 Hanauer S, Schwartz J, RobinsonM, et al.Mesalamine capsules for the treatment of active ulcerative colitis: results of a controlled trial. Am J Gastroenterol 1993; 88: 1188-97 Miner P, Hanauer S, Robinson M, et al. Safety and efficacy of controlled-release mesalamine for maintenance of remission in ulcerative colitis. Dig Dis Sci 1995; 40: 296-304 Singleton JW, Hanauer SB, Gitnick GL, et al. Mesalamine capsules for the treatment of active Crohn’s disease: results of a 16-week trial. Pentasa Crohn’s Disease Study Group[see comments]. Gastroenterology 1993; 104: 1293-301 Hanauer SB, Krawitt EL, Robinson M, et al. Long-term management of Crohn’s disease with mesalamine capsules (Pentasa ®). Am J Gastroenterol 1993; 88: 1343-51 Description 5-Aminosalicylic acid (5-ASA) is a metabolite and potential pharmacologically active component of sulphasalazine, a drug used in the treatment of Crohn’s disease and ulcerative colitis. However, the mechanism by which this drug works has not been established. In whole blood assays, 5-ASA proves to be a weak, non-selective inhibitor of both COX-1 and COX-2 with IC50 values of 410 and 61 μM, respectively. In ionophore-stimulated colonic mucosal cells, 1 mM 5-ASA does not inhibit prostaglandin E2 (PGE2) production, but does reduce leukotriene B4 (LTB4) synthesis approx. 50%. In ionophore-stimulated human leukocytes, 400 μM 5-ASA reduces LTB4 production approximately 20%. 5-ASA does not inhibit 15-hydroxy PGDH at concentrations up to 50 μM. Description Fisalamine is an intestinal metabolite of sulfasalazine useful in the treatment of ulcerative colitis and to a lesser degree in the management of Crohn’s disease. Administered as a suppository, it appears to lack the hypersensitivity-type side effects of sulfasalazine. Chemical Properties Off-White Crystals Originator Radcliffe Infirmary (United Kingdom) Uses In manufacture of light-sensitive paper, azo and sulfur dyes. Uses The active metabolite of Sulfasalazine (S699084). Anti-inflammatory (gastrointestinal). Uses anesthetic (local) Uses peroxidase substrate Uses For the treatment of active ulcerative proctitis. Uses 5-Aminosalicylic acid is used in the preparation of gastrointestinal anti-inflammatory agents. It is a metabolite of sulfasalazine. It acts as a drug involved in the treatment of Crohn s disease and ulcerative colitis. Further, it is used to make dyes and light-sensitive papers. Definition ChEBI: A monohydroxybenzoic acid that is salicylic acid which is substituted by an amino group at the 5-position. Manufacturing Process Procedure A: To 5-nitrosalicylic acid potassium salt (55 g, 246 mmol) dissolved in water (200 mL) was added potassium hydroxide pellets to reach pH 11.5. To this solution 2 g of Raney nickel were added. The mixture was heated-up to reflux and hydrazine hydrate (40 mL, 80% in water, 64 mmol) was added dropwise during 3-4 hrs. The reflux was maintened until HPLC showed the disappearance of the starting material and the complete reduction of 5-nitrosalicylic acid (3-4 hrs). The hot mixture was filtered under nitrogen and the solution was collected. The solution was cooled to 40°C and the pH was adjusted to 2.3 by addition of 35% HCl aqueous solution. The precipitation of 5-aminosalicylic acid occurred. The solution was cooled at 0°C, and after standing at this temperature for 2 hr, the precipitate was filtered, washed with water, and dried at 60-70°C. 5-Aminosalicylic acid was obtained in 89% yield. Procedure B: To 5-nitrosalicylic acid potassium salt (55 g, 246 mmol) dissolved in water (200 mL) was added potassium hydroxide pellets to reach pH 11.5. The solution was charged in a stainless steel autoclave and 2 g of Raney nickel are added. Hydrogen was introduced into the autoclave reaching a pressure of 8 atm. The mixture was heated-up to 100°C. The temperature was maintained until HPLC-test 5-aminosalicylic acid showed the disappearance of the starting material and the complete reduction of 5- aminosalicylic acid (6-8 hrs). Hydrogen was purged and replaced by nitrogen. The hot mixture was filtered under nitrogen, the filtrate was cooled to 40°C, and the pH was adjusted to 2.3 by addition of 35% HCl aqueous solution. The precipitation of the 5-aminosalicylic acid occurred. The solution was cooled at 0°C, and after standing at this temperature for 2 hr, the precipitate was filtered, washed with ion depleted water, and dried at 60-70°C. Brand name SALOFALK Therapeutic Function Antibacterial General Description Odorless white to pinkish crystals or purplish-tan powder. Aqueous solutions acidic (pH approximately 4.1 at 0.8 mg/L water) . Air & Water Reactions Sensitive to moisture. Water insoluble. Reactivity Profile 5-Aminosalicylic acid is incompatible with acids, acid chlorides, acid anhydrides, chloroformates and strong oxidizers. Fire Hazard Flash point data for 5-Aminosalicylic acid are not available; however, 5-Aminosalicylic acid is probably combustible. Biochem/physiol Actions 5-Aminosalicylic acid (5-ASA) is a first-line medicine, used to treat inflammatory bowel diseases like ulcerative colitis (UC). It has a high-efficiency rate in maintenance and induction of remission. 5-ASA is an active component of sulfasalazine and also consists of the carbohydrate polymer, inulin. It might exhibit anti-oxidant activity to lessen tissue injury. 5-ASA is vital for the prevention of T cell activation and proliferation. It negatively regulates cyclooxygenase and lipoxygenase pathways and lowers the formation of prostaglandins and leukotrienes. 5-ASA stimulates the membranous expression of E-cadherin and boosts intercellular adhesion. Clinical Use Induction and maintenance of remission in ulcerative colitis Safety Profile Poison by intraperitoneal route.Moderately toxic by ingestion. Human systemic effects byingestion: hypermotility, diarrhea, dermatitis, increasedbody temperature. When heated to decomposition it emitstoxic fumes of NOx. Drug interactions Potentially hazardous interactions with other drugs None known Metabolism The absorbed part of mesalazine is almost completely acetylated in the gut wall and in the liver to acetyl-5- aminosalicylic acid. The acetylated metabolite is excreted mainly in urine by tubular secretion, with traces of the parent compound. Purification Methods It crystallises as needles from H2O containing a little NaHSO3 to avoid aerial oxidation to the quinone-imine. The Me ester gives needles from *C6H6, m 96o, and the hydrazide has m 180-182o (from H2O). [Fallab et al. Helv Chim Acta 34 26 1951, Shavel J Amer Pharm Assoc 42 402 1953, Beilstein 14 IV 2058.]   5-Aminosalicylic acid Preparation Products And Raw materials Raw materials Sodium carbonate-->ZINC-->Water-->Sodium dithionite-->Methanesulfonyl chloride-->Salicylic acid-->Tyramine-->5-Nitrosalicylic acid-->Hydrogen-->Hydrazine hydrate-->Aluminium-nickel Preparation Products Benzoic acid, 2-[[1-amino-7-[[4-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-methoxyphenyl]azo]-8-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-5-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sul-->Sulfasalazine-->METHYL 5-AMINOSALICYLATE-->BOC-3-AMINOBENZOIC ACID-->OLSALAZINE-->Benzoic acid, 2-[[1-amino-7-[[4-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-methoxyphenyl]azo]-8-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-5-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sul-->tetrasodium 2-[[2-amino-6-[[4-[[4-[(3-carboxylato-4-hydroxyphenyl)azo]-7-sulphonato-1-naphthyl]azo]-2,5-dimethoxyphenyl]azo]-5-hydroxy-7-sulphonato-1-naphthyl]azo]-5-nitrobenzoate

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Leader Biochemical Group is a large leader incorporated industry manufacturers and suppliers of advanced refined raw materials From the year of 1996 when our factory was put into production to year of 2020, our group has successively invested in more than 52 factories with shares and subordinates.We focus on manufacture Pharm & chemicals, functional active ingredients, nutritional Ingredients, health care products, cosmetics, pharmaceutical and refined feed, oil, natural plant ingredients industries to provide top quality of GMP standards products.All the invested factories' product lines cover API and intermediates, vitamins, amino acids, plant extracts, daily chemical products, cosmetics raw materials, nutrition and health care products, food additives, feed additives, essential oil products, fine chemical products and agricultural chemical raw materials And flavors and fragrances. Especially in the field of vitamins, amino acids, pharmaceutical raw materials and cosmetic raw materials, we have more than 20 years of production and sales experience. All products meet the requirements of high international export standards and have been recognized by customers all over the world. Our manufacture basement & R&D center located in National Aerospace Economic & Technical Development Zone Xi`an Shaanxi China. Now not only relying on self-cultivation and development as well as maintains good cooperative relations with many famous research institutes and universities in China. Now, we have closely cooperation with Shanghai Institute of Organic Chemistry of Chinese Academy of Science, Beijing Institute of Material Medical of Chinese Academy of Medical Science, China Pharmaceutical University, Zhejiang University. Closely cooperation with them not only integrating Science and technology resources, but also increasing the R&D speed and improving our R&D power. Offering Powerful Tech supporting Platform for group development. Keep serve the manufacture and the market as the R&D central task, focus on the technical research.  Now there are 3 technology R & D platforms including biological extract, microorganism fermentation and chemical synthesis, and can independently research and develop kinds of difficult APIs and pharmaceutical intermediates. With the strong support of China State Institute of Pharmaceutical Industry (hereinafter short for CSIPI), earlier known as Shanghai Institute of Pharmaceutical Industry (SIPI), we have unique advantages in the R & D and industrialization of high-grade, precision and advanced products.  Now our Group technical force is abundant, existing staff more that 1000 people, senior professional and technical staff accounted for more than 50% of the total number of employees, including 15 PhD research and development personnel, 5 master′ S degree in technical and management personnel 9 people. We have advanced equipment like fermentation equipment and technology also extraction, isolation, purification, synthesis with rich production experience and strict quality control system, According to the GMP required, quickly transforming the R&D results to industrial production in time, it is our advantages and our products are exported to North and South America, Europe, Middle East, Africa, and other five continents and scale the forefront in the nation, won good international reputation.  We believe only good quality can bring good cooperation, quality is our key spirit during our production, we are warmly welcome clients and partner from all over the world contact us for everlasting cooperation, Leader will be your strong, sincere and reliable partner in China.

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5-Aminosalicylic acid Basic information Overview Indication Mode of action Pharmacokinetics Adverse reactions and toxicity References Product Name: 5-Aminosalicylic acid Synonyms: 5-Aminosalicylic acid, 98.5%, IKK inhibitor;2-HYDROXY-5-AMINOBENZOIC ACID;3-Carboxy-4-hydroxyaniline;5-AMINO-2-HYDROXYBENZOIC ACID;5-AMINOSALICYLIC ACID;5-ASA;5-AS;rowasa CAS: 89-57-6 MF: C7H7NO3 MW: 153.14 EINECS: 201-919-1 Product Categories: API;CITANEST;Pharmaceuticals;Carboxylic Acids;Aromatics;Aromatics, Metabolites & Impurities, Pharmaceuticals, Intermediates & Fine Chemicals;Carboxylic Acids;Phenyls & Phenyl-Het;Organic acids;Various Metabolites and Impurities;Fendosal;Intermediates & Fine Chemicals;Phenyls & Phenyl-Het;Fluorescent;FINE Chemical & INTERMEDIATES;Aromatic Carboxylic Acids, Amides, Anilides, Anhydrides & Salts;Metabolites & Impurities Mol File: 89-57-6.mol   5-Aminosalicylic acid Chemical Properties Melting point  275-280 °C (dec.) (lit.) Boiling point  276.03°C (rough estimate) density  1.3585 (rough estimate) refractive index  1.5500 (estimate) Fp  279-281°C storage temp.  2-8°C solubility  Soluble in dimethyl sulfoxide. form  tablets pka 2.74, 5.84(at 25℃) color  off-white to gray PH 4.0-4.1 (0.8g/l, H2O, 20℃) PH Range Non-B uorescence (3.1) to light green B uorescence (4.4) Water Solubility  <0.1 g/100 mL at 21 ºC Decomposition  279-281 ºC Merck  14,5904 BRN  2090421 Stability: Stable. Incompatible with acids, acid anhydrides, acid chlorides, chloroformates, strong oxidizing agents. Major Application Detergent, hair dyes, prevention of colorectal cancer, treating inflammatory bowel disease, autoimmune disorders, gastrointestinal inflammation, chemokine-mediated diseases, mucosal tissue disorder, sleep disorders, rectoanal tenesmus, ulcerative colitis InChIKey KBOPZPXVLCULAV-UHFFFAOYSA-N CAS DataBase Reference 89-57-6(CAS DataBase Reference) NIST Chemistry Reference Mesalamine(89-57-6) EPA Substance Registry System Benzoic acid, 5-amino-2-hydroxy- (89-57-6)   Safety Information Hazard Codes  Xi Risk Statements  36/37/38-52/53 Safety Statements  26-36-24/25-61-37/39 WGK Germany  2 RTECS  VO1400000 F  8-10-23 Autoignition Temperature 280 °C Hazard Note  Irritant TSCA  Yes HazardClass  IRRITANT HS Code  29225000 Hazardous Substances Data 89-57-6(Hazardous Substances Data) Toxicity LD50 orally in Rabbit: 2800 mg/kg LD50 dermal Rat > 5000 mg/kg MSDS Information Provider Language 3-Carboxy-4-hydroxyaniline English SigmaAldrich English ACROS English ALFA English   5-Aminosalicylic acid Usage And Synthesis Overview Mesalazine is an anti-inflammatory agent, structurally related to the salicylates, which is active in inflammatory bowel disease. It is considered to be the active moiety of sulphasalazine. A study of the therapeutic properties of sulfasalazine and its constituents[mesalazine (5-amino salicylic acid, 5-ASA) and sulfapyridine] indicated that mesalazine is the therapeutically active component, while sulfapyridine acts as an inert carrier molecule to facilitate delivery to the colon.[2] This discovery, coupled with the implication of sulfapyridine in most of the adverse events associated with sulfasalazine treatment,[3] led to the development of Mesalazine as a pure therapeutic entity. Mesalazine (fig. 1) is believed to exert its effects via topical actions in the gut lumen. However, orally administered unconjugated mesalazine is extensively absorbed from the proximal small bowel,[4] and alternative oral dosage formulations have been developed to facilitate the delivery of mesalazine to more distal sites of inflammation. These include microgranules of mesalazine coated with a semipermeable ethylcellulose membrane (Pentasa®), mesalazine encased within a pH-dependent acrylic resin (pH-dependent delayed-release preparations: Salofalk®, Claversal®, Mesasal®, Asacol®), or conjugation of mesalazine via an azo bond to an inert carrier (balsalazide) or to another mesalazine molecule (olsalazine). In each case the properties of the delivery system dictate the site of mesalazine release. Figure 1 the chemical structure of Mesalazine Indication It is used for the treatment of active ulcerative proctitis. Mode of action The pathogenesis of IBD and hence the mechanism by which mesalazine exerts its therapeutic effects in this disease remain elusive. However, lipid mediators[leukotrienes (LT), prostaglandins (PG), platelet-activating factor (PAF)], cytokines[including interleukins (IL), interferon-(IFN)γ and tumour necrosis factor-(TNF)α] and reactive oxygen species have been implicated in the nonspecific inflammation and tissue damage characteristic of IBD.[5-7] The modulation of these molecules by mesalazine may underlie the therapeutic effects of the drug.[8-11] Numerous in vitro studies have investigated the effects of mesalazine on inflammatory processes in colonic epithelial cell lines or biopsy specimens from patients with active ulcerative colitis or with normal colons. Mesalazine also appears to reduce in vitro levels of LTC4, 5-hydroxyeicosatetraenoic acid (HETE), 11-, 12-, 15-HETE, PGD2 and platelet-activating factor. In addition to inhibiting interferon (IFN)-γ binding, mesalazine reduced IFNγ-induced cell permeability and expression of the HLA-DR product of the major histocompatibility complex in colonic epithelial cell lines. Recent evidence suggests that mesalazine reverses the antiproliferative effects of tumour necrosis factor-(TNF)α and inhibits TNFα signalling events in intestinal cells. Mesalazine may also reduce interleukin (IL)-1/1β and IL-2 production. A variety of data from experimental work, animal studies and preliminary clinical trials strongly suggest that mesalazine may have antineoplastic and potentially prophylactic (chemo-preventive) properties, which are comparable with those found with aspirin and other NSAIDs. Mesalazine shares similar molecular targets, interfering with inflammation, proliferation and ⁄ or apoptosis, as aspirin and other NSAIDs. This can be explained by the close molecular similarity of mesalazine and aspirin, in which the former differs only in structure by the presence of an amino group at position 5 of the benzene ring. Recent experimental and preliminary clinical work has demonstrated that mesalazine may have in vitro and in vivo inhibitory properties comparable to other NSAIDs.[12-14] Reversible inhibition of COX-1 and COX-2, NF-kB activation, MAP kinases and Bcl-2 by mesalazine, was found in experiments using different cell systems including lymphocytes, polymorphonuclear leucocytes (PMNLs) and cultures from normal and neoplastic cell lines of animal and human origin.[15] In contrast to aspirin, which was shown to inhibit COX irreversibly, mesalazine (and other NSAIDs) inhibit COX and other steps (e.g. Bcl-2) reversibly. The molecular details for the majority of these reactions are only partly known, but recent work has shed light on some of these. Thus, inhibition of NF-kB activation is most likely to be mediated by inhibition of IkB degradation, the inhibitory unit of the NF-kB complex. It is worth noting that mesalazine has rather unspecific COX inhibitory properties with no preference for COX-2. Pharmacokinetics After a single oral dose of prolonged-release mesalazine 250mg to volunteers, the median lag time (tlag) to the first detectable plasma concentration of mesalazine was 45 minutes (range 15 to 150). A maximum plasma concentration (Cmax) of 0.6 μmol/L (range 0.4 to 1.4) was recorded 240 minutes (tmax; 90 to 300) after dose administration. Corresponding values for acetyl mesalazine were: tlag 22 minutes (15 to 45), Cmax 2.9 μmol/L (1.6 to 3.4) and tmax 105 minutes (60 to 300).[16] The plasma concentration-time profile following a single oral dose of prolonged-release mesalazine 1g to healthy volunteers was consistent with a continuous release of drug throughout the gastrointestinal tract. Plasma concentrations peaked at 0.53 mg/L 4 hours after administration, declined rapidly to 0.03 mg/L at 12 hours, then remained fairly constant over the next 24 hours before resuming the final decline, becoming undetectable 60 hours after administration. The area under the plasma concentrationtime curve (AUC) for mesalazine was 4.37-mg/L • h. Little is known about the distribution of prolonged-release mesalazine. In 9 pregnant women with IBD who were receiving prolonged-release mesalazine 0.5 to 3 g/day, low concentrations (approximate values from graph) of mesalazine and acetylmesalazine were measured in maternal (≤0.5 and ≤7.5 μmol/L) and fetal plasma (≤0.25 and ≤18 μmol/L). In 2 patients, low concentrations of mesalazine were detected in breast milk. Mean acetyl mesalazine concentrations in breast milk were 4.4 to 47.5 μmol/L.[18, 19] Mesalazine is primarily metabolized by acetylation in the gut wall and the liver, forming the therapeutically inert metabolite acetyl mesalazine. Both the parent compound and the metabolite are excreted in the urine.[20] After a single oral administration of prolonged-release mesalazine 0.25g in 6 volunteers, the apparent mean elimination half-life of acetyl mesalazine was 802 minutes (range 608 to 993). Determination of the terminal half-life of mesalazine was not possible because of low plasma concentrations.[16] After oral administration of prolonged-release mesalazine 1.5 to 4 g/day to volunteers, excretion of unchanged mesalazine accounted for 8 to 12% of the daily dose. Total urinary excretion of mesalazine plus acetyl mesalazine was 29 to 53%.[21,22,23] In volunteers, renal clearance of acetyl mesalazine was 12 L/h (201 ml/min) at steady state.[21] In a 7-day study of 15 patients with ulcerative colitis, daily urinary excretion of mesalazine and acetyl mesalazine was higher with prolonged-release mesalazine (1.5 g/day) and pH-dependent delayed-release mesalazine (Asacol ®, 1.2 g/day) than with olsalazine (1 g/day).[17] Adverse reactions and toxicity In an 8-week randomized trial of prolonged release mesalazine 1, 2 and 4 g/day or placebo in patients (n = 314) with ulcerative colitis, 16% of patients receiving active drug experienced treatment-related adverse events, compared with 22% of patients in the placebo group. No dose-response relationship was observed. In total, 5%, 9% and 7% of patients in the 1, 2 and 4 g/day dosage groups discontinued therapy because of treatment-related or unrelated events, compared with 12% of placebo treated patients. The most common treatment limiting adverse events were diarrhoea, abdominal pain, fever and melaena.[24] In another 16-week study, the most common adverse events considered to be related to prolonged-release mesalazine treatment were nausea and/or vomiting (7.4 vs 3.7% in the placebo group), headache (5.2 vs 3.7%) and abdominal pain (4.3 vs 5.0%).[26] In a 12-month study involving 205 patients with ulcerative colitis, adverse events necessitating withdrawal occurred in 14% and 33% (2% and 6% considered to be treatment-related) of patients receiving prolonged-release mesalazine 4 g/day and placebo, respectively. Treatment-related adverse events (most commonly nausea 2.9%, abdominal pain 1.9% and dyspepsia 1.9%) were experienced in 6.8% of patients receiving prolonged-release mesalazine. In contrast, 11.8% of patients in the placebo group experienced adverse events related to therapy.[25] In a non-comparative study in 467 patients with Crohn’s disease who received prolongedrelease mesalazine at dosages up to 4 g/day for a median of 14 months, 12%of patients discontinued because of treatment-related adverse events, of which the most commonly reported were diarrhoea (4.3%), abdominal pain (3.6%) and dyspepsia (3.1%).[27] References Martin F. Oral 5-aminosalicylic acid preparations in treatment of inflammatory bowel disease: an update. Dig Dis Sci 1987; 32 (12 Suppl.): 57S-63S Azad Khan AK, Piris J, Truelove SC. An experiment ot determine the active therapeutic moiety of sulphasalazine. Lancet 1979; II (8044): 892-5 Schröder H, Price E, Evans DA. Acetylator phenotype and adverse events of sulphasalazine in healthy subjects. Gut 1972; 13 (4): 278-84 Haagen Nielsen O, Bondesen S. Kinetics of 5-aminosalicylic acid after jejunal instillation in man. Br J Clin Pharmacol 1983; 16 (6): 738-40 Ireland A, Jewell DP. Mechanism of action of 5-aminosalicylic acid and its derivatives. Clin Sci 1990; 78: 119-25 Greenfield SM, Punchard NA, Teare JP, et al. Review article: the mode of action of the aminosalicylates in inflammatory bowel disease. Aliment Pharmacol Ther 1993; 7: 369-83 Travis SPL, Jewell DP. Salicylates for ulcerative colitis – their mode of action. Pharmacol Ther 1994; 63: 135-61 Schmidt C, Fels T, Baumeister B, et al. The effect of 5aminosalicylate and para-aminosalicylate on the synthesis of prostaglandin E2 and leukotriene B4 in isolated colonic mucosal cells. Curr Med Res Opin 1996; 13 (7): 417-25 Capasso F, Tavares IA, BennettA. Release of platelet-activating factor (PAF) from human colon mucosa and its inhibition by 5-aminosalicylic acid. Drugs Exp Clin Res 1991; 17: 351-3 Rachmilewitz D, Karmeli F, Schwartz LW, et al. Effect of aminophenols (5-ASA and 4-ASA) on colonic interleukin-1 generation. Gut 1992; 33: 929-32 Di Paolo MC, Merrett MN, Crotty B, et al. 5-Aminosalicylic acid inhibits the impaired epithelial barrier function induced by gamma interferon. Gut 1996; 38: 115-9 Vainio H, Morgan G. Non-steroidal anti-inflammatory drugs and the chemoprevention of gastrointestinal cancers. Scand J Gastroenterol 1998; 33: 785–9. Bus PJ, Nagtegaal ID, Verspaget HW, et al. Mesalazine-induced apoptosis of colorectal cancer: on the verge of a new chemopreventive era Aliment Pharmacol Ther 1999; 13: 1397–402. Reinacher-Schick A, Seidensticker F, Petrasch S, et al. Mesalazine changes apoptosis and proliferation in normal mucosa of patients with sporadic polyps of the large bowel. Endoscopy 2000; 32: 245–54. Egan LJ, Mays DC, Huntoon MP, et al. Inhibition of interleukin-1-stimulated NF-jB RelA ⁄ p65 phosphorylation by mesalazine is accompanied by decreased transcriptional activity. J Biol Chem 1999; 274: 26448–53. Bondesen S, Hegnhoj J, Larsen F, et al. Pharmacokinetics of 5-aminosalicylic acid in man following administration of intravenous bolus and Per Os slow-release formulation. Dig Dis Sci 1991; 36: 1735-40 Daneshmend TK, Hendrickse M, Salzmann M, et al. Does systemic absorption of 5-aminosalicylic acid from olsalazine (Dipentum®) and mesalazine (Asacol® and Pentasa®) differ significantly in ulcerative colitis [abstract]. Gut 1994; 35 Suppl. 4: 233 Staerk-Laursen L, Stokholm M, Bukhave K, et al. Disposition of 5-aminosalicylic acid by olsalazine and three mesalazine preparations in patients with ulcerative colitis: comparison of intraluminal colonic concentrations, serum values, and urinary excretion. Gut 1990; 31: 1271-6 Christensen LA, Rasmussen SN, Hansen SH. Disposition of 5-aminosalicylic acid and N-acetyl-5-aminosalicylic acid in fetal and maternal body fluids during treatment with different 5-aminosalicylic acid preparations. Acta Obstet Gynecol Scand 1994; 74: 399-402 Lauritsen K, Laursen LS, Rask-Madsen J. Clinical pharmacokinetics of drugs used in the treatment of gastrointestinal diseases (Part II). Clin Pharmacokinet 1990; 19: 94-125 Rasmussen SN, Bondesen S, Hvidberg EF, et al. 5-Aminosalicylic acid in a slow-release prepararation: bioavailability, plasma level, and excretion in humans. Gastroenterolo 1982; 83: 1062-70 Christensen LA, Fallingborg J, Abildgaard K, et al. Topical and systemic availability of 5-amino-salicylate: comparisons of three controlled release preparations in man. Aliment Pharmacol Ther 1990; 4: 523-33 Christensen LA, Fallingborg J, Jacobsen BA, et al. Comparative bioavailability of 5-aminosalicylic acid from a controlled release preparation and an azo-bond preparation. Aliment Pharmacol Ther 1994; 8: 289-94 Hanauer S, Schwartz J, RobinsonM, et al.Mesalamine capsules for the treatment of active ulcerative colitis: results of a controlled trial. Am J Gastroenterol 1993; 88: 1188-97 Miner P, Hanauer S, Robinson M, et al. Safety and efficacy of controlled-release mesalamine for maintenance of remission in ulcerative colitis. Dig Dis Sci 1995; 40: 296-304 Singleton JW, Hanauer SB, Gitnick GL, et al. Mesalamine capsules for the treatment of active Crohn’s disease: results of a 16-week trial. Pentasa Crohn’s Disease Study Group[see comments]. Gastroenterology 1993; 104: 1293-301 Hanauer SB, Krawitt EL, Robinson M, et al. Long-term management of Crohn’s disease with mesalamine capsules (Pentasa ®). Am J Gastroenterol 1993; 88: 1343-51 Description 5-Aminosalicylic acid (5-ASA) is a metabolite and potential pharmacologically active component of sulphasalazine, a drug used in the treatment of Crohn’s disease and ulcerative colitis. However, the mechanism by which this drug works has not been established. In whole blood assays, 5-ASA proves to be a weak, non-selective inhibitor of both COX-1 and COX-2 with IC50 values of 410 and 61 μM, respectively. In ionophore-stimulated colonic mucosal cells, 1 mM 5-ASA does not inhibit prostaglandin E2 (PGE2) production, but does reduce leukotriene B4 (LTB4) synthesis approx. 50%. In ionophore-stimulated human leukocytes, 400 μM 5-ASA reduces LTB4 production approximately 20%. 5-ASA does not inhibit 15-hydroxy PGDH at concentrations up to 50 μM. Description Fisalamine is an intestinal metabolite of sulfasalazine useful in the treatment of ulcerative colitis and to a lesser degree in the management of Crohn’s disease. Administered as a suppository, it appears to lack the hypersensitivity-type side effects of sulfasalazine. Chemical Properties Off-White Crystals Originator Radcliffe Infirmary (United Kingdom) Uses In manufacture of light-sensitive paper, azo and sulfur dyes. Uses The active metabolite of Sulfasalazine (S699084). Anti-inflammatory (gastrointestinal). Uses anesthetic (local) Uses peroxidase substrate Uses For the treatment of active ulcerative proctitis. Uses 5-Aminosalicylic acid is used in the preparation of gastrointestinal anti-inflammatory agents. It is a metabolite of sulfasalazine. It acts as a drug involved in the treatment of Crohn s disease and ulcerative colitis. Further, it is used to make dyes and light-sensitive papers. Definition ChEBI: A monohydroxybenzoic acid that is salicylic acid which is substituted by an amino group at the 5-position. Manufacturing Process Procedure A: To 5-nitrosalicylic acid potassium salt (55 g, 246 mmol) dissolved in water (200 mL) was added potassium hydroxide pellets to reach pH 11.5. To this solution 2 g of Raney nickel were added. The mixture was heated-up to reflux and hydrazine hydrate (40 mL, 80% in water, 64 mmol) was added dropwise during 3-4 hrs. The reflux was maintened until HPLC showed the disappearance of the starting material and the complete reduction of 5-nitrosalicylic acid (3-4 hrs). The hot mixture was filtered under nitrogen and the solution was collected. The solution was cooled to 40°C and the pH was adjusted to 2.3 by addition of 35% HCl aqueous solution. The precipitation of 5-aminosalicylic acid occurred. The solution was cooled at 0°C, and after standing at this temperature for 2 hr, the precipitate was filtered, washed with water, and dried at 60-70°C. 5-Aminosalicylic acid was obtained in 89% yield. Procedure B: To 5-nitrosalicylic acid potassium salt (55 g, 246 mmol) dissolved in water (200 mL) was added potassium hydroxide pellets to reach pH 11.5. The solution was charged in a stainless steel autoclave and 2 g of Raney nickel are added. Hydrogen was introduced into the autoclave reaching a pressure of 8 atm. The mixture was heated-up to 100°C. The temperature was maintained until HPLC-test 5-aminosalicylic acid showed the disappearance of the starting material and the complete reduction of 5- aminosalicylic acid (6-8 hrs). Hydrogen was purged and replaced by nitrogen. The hot mixture was filtered under nitrogen, the filtrate was cooled to 40°C, and the pH was adjusted to 2.3 by addition of 35% HCl aqueous solution. The precipitation of the 5-aminosalicylic acid occurred. The solution was cooled at 0°C, and after standing at this temperature for 2 hr, the precipitate was filtered, washed with ion depleted water, and dried at 60-70°C. Brand name SALOFALK Therapeutic Function Antibacterial General Description Odorless white to pinkish crystals or purplish-tan powder. Aqueous solutions acidic (pH approximately 4.1 at 0.8 mg/L water) . Air & Water Reactions Sensitive to moisture. Water insoluble. Reactivity Profile 5-Aminosalicylic acid is incompatible with acids, acid chlorides, acid anhydrides, chloroformates and strong oxidizers. Fire Hazard Flash point data for 5-Aminosalicylic acid are not available; however, 5-Aminosalicylic acid is probably combustible. Biochem/physiol Actions 5-Aminosalicylic acid (5-ASA) is a first-line medicine, used to treat inflammatory bowel diseases like ulcerative colitis (UC). It has a high-efficiency rate in maintenance and induction of remission. 5-ASA is an active component of sulfasalazine and also consists of the carbohydrate polymer, inulin. It might exhibit anti-oxidant activity to lessen tissue injury. 5-ASA is vital for the prevention of T cell activation and proliferation. It negatively regulates cyclooxygenase and lipoxygenase pathways and lowers the formation of prostaglandins and leukotrienes. 5-ASA stimulates the membranous expression of E-cadherin and boosts intercellular adhesion. Clinical Use Induction and maintenance of remission in ulcerative colitis Safety Profile Poison by intraperitoneal route.Moderately toxic by ingestion. Human systemic effects byingestion: hypermotility, diarrhea, dermatitis, increasedbody temperature. When heated to decomposition it emitstoxic fumes of NOx. Drug interactions Potentially hazardous interactions with other drugs None known Metabolism The absorbed part of mesalazine is almost completely acetylated in the gut wall and in the liver to acetyl-5- aminosalicylic acid. The acetylated metabolite is excreted mainly in urine by tubular secretion, with traces of the parent compound. Purification Methods It crystallises as needles from H2O containing a little NaHSO3 to avoid aerial oxidation to the quinone-imine. The Me ester gives needles from *C6H6, m 96o, and the hydrazide has m 180-182o (from H2O). [Fallab et al. Helv Chim Acta 34 26 1951, Shavel J Amer Pharm Assoc 42 402 1953, Beilstein 14 IV 2058.]   5-Aminosalicylic acid Preparation Products And Raw materials Raw materials Sodium carbonate-->ZINC-->Water-->Sodium dithionite-->Methanesulfonyl chloride-->Salicylic acid-->Tyramine-->5-Nitrosalicylic acid-->Hydrogen-->Hydrazine hydrate-->Aluminium-nickel Preparation Products Benzoic acid, 2-[[1-amino-7-[[4-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-methoxyphenyl]azo]-8-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-5-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sul-->Sulfasalazine-->METHYL 5-AMINOSALICYLATE-->BOC-3-AMINOBENZOIC ACID-->OLSALAZINE-->Benzoic acid, 2-[[1-amino-7-[[4-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-methoxyphenyl]azo]-8-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-5-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sul-->tetrasodium 2-[[2-amino-6-[[4-[[4-[(3-carboxylato-4-hydroxyphenyl)azo]-7-sulphonato-1-naphthyl]azo]-2,5-dimethoxyphenyl]azo]-5-hydroxy-7-sulphonato-1-naphthyl]azo]-5-nitrobenzoate