Spectrophotometric Determination of Bio-Active Compounds in Commercial Samples with Nitrous Acid and Cresyl Fast Violet Acetate
作者:
ChilukuriS.P. Sastry,
KommulaR. Srinivas,
KommuriM.M.K. Prasad,
期刊:
Analytical Letters
(Taylor Available online 1996)
卷期:
Volume 29,
issue 8
页码: 1329-1349
ISSN:0003-2719
年代: 1996
DOI:10.1080/00032719608001485
出版商: Taylor & Francis Group
关键词: Bio-active compounds in commercial samples;nitrous acid;cresyl fast violet acetate;indirect visible spectrophotometry
数据来源: Taylor
摘要:
A simple and sensitive method for the spectrophotometric determination of bio-active compounds (drugs and non-nutritive sweeteners) containing reactive functional groups, viz., aromatic primary amine (drugs: Dapsone, Sulphamethoxazole), aromatic secondary amine (drug: Pindolol), aliphatic secondary amine (non-nutritive sweetener: Cyclamate), acid hydrazide (drug: Isoniazid) and thiol (drug: Captopril), is proposed. The method involves the addition of excess of sodium nitrite to the compound in the presence of 0.25 M hydrochloric acid solution and the unreacted nitrous acid is determined by the measurement of corresponding decrease in the absorbance of cresyl fast violet acetate (Δmax: 555 nm), the most suitable one out of several dyes tested. This method was applied for the determination of bio-active compounds in commercial samples. (drugs: pharmaceutical formulations; non-nutritive sweetener (cyclamate): foodstuffs). The newly proposed method enabled the determination of the bio-active compounds in microgram quantities (0.1 - 0.5 μg/ml). Standard deviation values evaluated through replicate determinations were found to be < 0.5 mg per dose (RSD : 0.5 - 1.2%). The common excipients do not effect the determination of the drugs in pharmaceutical formulations. Many of the usually occurring additives in food stuffs are tolerated to a very high level in the determination of cyclamate in beverages, syrup, ice candy and ice cream. The validity of the method was tested against the reference method. Recoveries to the tune of 99.2 - 101.1% were observed by adopting this method.
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