Document Detail

Stopped flow ESR study of the action of carbohydrates on ascorbic acid oxidation in aqueous solution.
MedLine Citation:
PMID:  2987149     Owner:  NLM     Status:  MEDLINE    
The influence of added carbohydrate on the decay kinetics of the ascorbic acid free radical generated in deaerated aqueous solutions by the action of potassium ferricyanide on ascorbic acid has been studied. Addition of carbohydrate (less than or equal to 0.5M) generally leads to a small decrease in radical decay rate. In our system this probably arises from reduced reactant diffusion in solutions of increased viscosity rather than the preferential chelation previously suggested to explain inhibition in the copper (II) catalyzed oxidation. The ascorbic acid free radical shows negligible tendency to react with glucose, sorbitol or maltose. The decrease in its decay rate observed on addition of carbohydrate is probably caused by the increase in solvent viscosity.
W H Kalus; W G Filby
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal for vitamin and nutrition research. Internationale Zeitschrift für Vitamin- und Ernährungsforschung. Journal international de vitaminologie et de nutrition     Volume:  55     ISSN:  0300-9831     ISO Abbreviation:  Int J Vitam Nutr Res     Publication Date:  1985  
Date Detail:
Created Date:  1985-07-25     Completed Date:  1985-07-25     Revised Date:  2007-02-21    
Medline Journal Info:
Nlm Unique ID:  1273304     Medline TA:  Int J Vitam Nutr Res     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  85-9     Citation Subset:  IM    
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MeSH Terms
Ascorbic Acid*
Carbohydrates / pharmacology*
Electron Spin Resonance Spectroscopy
Ferricyanides / pharmacology
Free Radicals
Glucose / pharmacology
Maltose / pharmacology
Sorbitol / pharmacology
Reg. No./Substance:
0/Carbohydrates; 0/Ferricyanides; 0/Free Radicals; 0/Solutions; 13746-66-2/potassium ferricyanide; 50-70-4/Sorbitol; 50-81-7/Ascorbic Acid; 50-99-7/Glucose; 69-79-4/Maltose; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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