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Determination of ascorbic acid with o-iodosobenzoate: analysis of mixtures of ascorbic acid with methionine and cysteine or glutathione.
MedLine Citation:
PMID:  18963074     Owner:  NLM     Status:  In-Data-Review    
Ascorbic acid has been determined in pure solutions, pharmaceutical preparations, food-stuffs and biological fluids by titration with o-iodosobenzoate, with visual or photometric detection of the end-point, with leuco-2,6-dichlorophenolindophenol plus potassium iodide as indicator. Cysteine and glutathione, which interfere quantitatively, are masked by cyanoethylation; the cyanoethylated product and methionine have been determined with o-iodosobenzoate in the presence of acidified potassium bromide, with Methyl Red as indicator. Procedures are given for the analysis of mixtures of ascorbic acid with sulphur-containing amino-acids.
K K Verma
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Talanta     Volume:  29     ISSN:  0039-9140     ISO Abbreviation:  Talanta     Publication Date:  1982 Jan 
Date Detail:
Created Date:  2008-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  41-5     Citation Subset:  -    
Department of Chemistry, University of Jabalpur, Jabalpur 482001, India.
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