Bromocresol Purple Catalog Number: 150518, 195080 Bromocresol Purple Structure :(free acid) Free Acid Sodium Salt Molecular Formula: C21H16Br2O5S C21H15Br2O5SNa Molecular Weight: 540.2 562.2 CAS # 115-40-2 62625-30-3 Synonym: 5',5''-Dibromo-o-cresolsulfonephthalein Physical Description: Reddish-brown crystalline powder (sodium salt); Orange to purplish-brown crystalline powder (free acid) pK: 6.3 Solubility: Free Acid: Soluble in water (20 mg/ml), ethanol (80 mg/ml) or methyl cellosolve (300 mg/ml). Sodium Salt: Soluble in water (80 mg/ml), ethanol (20 mg/ml) or methyl cellosolve (90 mg/ml). Description: Typically used as a pH indicator (5.2-6.8 : yellow to blue-purple). Bromocresol purple binds quantitatively with human serum1 albumin forming a stable complex with absorbance maximum at 600 nm. The intensity of the color produced is directly proportional to the albumin concentration in the sample. Availability: Catalog Number Description Size 195080 Bromocresol Purple 5 g 25 g 100 g 150518 Bromocresol Purple, Sodium Salt 5 g 25 g References: 1. Hill, P.G. and Wells, T.N.C., Ann. Clin. Biochem., v. 20, 264 (1983). 2. Orndorff, W.R. and Purdy, A.C., J. Am. Chem. Soc., v. 48, 2216 (1926). file:///C|/Users/Administrator/Desktop/新建文件夹/150518.htm[2013/3/4 13:44:01] Bromocresol Purple 3. "Reduction of reaction differences between human mercaptalbumin and human nonmercaptalbumin measured by the bromocresol purple method." Clin. Chim. Acta, v. 289:1-2, 69-78 (1999). 4. "A new photometric assay with bromocresol purple for testing in vitro antitrichomonal activity in aerobic environment." Arzneimittelforschung, v. 49:1, 51-55 (1999). 5. "Multivariate analysis of the association of bromocresol purple anion with bovine serum albumin." Biochim. Biophys. Acta, v. 1341:2, 207-216 (1997). 6. 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