Studies on Photodecomposition of L-Ascorbic Acid
نویسندگان
چکیده
منابع مشابه
Topical L-ascorbic acid: percutaneous absorption studies.
BACKGROUND Reactive oxygen species generated by ultraviolet light result in photocarcinogenic and photoaging changes in the skin. Antioxidants protect skin from these insults. OBJECTIVE This study defines formulation characteristics for delivering L-ascorbic acid into the skin to supplement the skin's natural antioxidant reservoir. METHODS L-ascorbic acid or its derivatives were applied to ...
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Euglena gracilis was found to contain a peroxidase that specifically requires L-ascorbic acid as the natural electron donor in the cytosol. The presence of an oxidation-reduction system metabolizing L-ascorbic acid was demonstrated in Euglena cells. Oxidation of L-ascorbic acid by the peroxidase, and the absence of ascorbic acid oxidase activity, suggests that the system functions to remove H20...
متن کاملStudies associated with ascorbic acid.
1) The effect of 1 g daily doses of L-ascorbic acid in reducing the incidence of the common cold in a group of volunteers was compared with a control group receiving a placebo, The survey lasted 16 weeks during the winter months of 1971/1972. The results (1) showed that the 47 volunteers receiving L-ascorbic acid suffered a total of 44 colds, whereas the 43 people taking dummy pills had 80 cold...
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The medium used contained 3g of substrate, 150ml of 1/15M phosphate buffer and 150ml of sterile distilled water. 0.5g (dry weight) of the adapted cells was added to the medium and the whole was incubated at 30•‹ for 20 hours. For detecting the intermediate products, paper chromatography was chiefly used. For developing the nonvolatile acids, n-butanol-acetic acid-water (4:1:1) was used and the ...
متن کاملBiological synthesis of L-ascorbic acid in animal tissues: conversion of L-gulonolactone into L-ascorbic acid.
The enzyme system catalysing the conversion of D-glucuronolactone and L-gulonolactone into Lascorbic acid in animal tissues has been previously reported to be entirely located in the microsomal fractions ofratand goat-liver homogenates (Burns, Peyser & Moltz, 1956; Chatterjee, Ghosh, Ghosh & Guha, 1957a, b; 1958a, b). The kidney tissue has been found to be the site of this conversion in amphibi...
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ژورنال
عنوان ژورنال: Eiyo To Shokuryo
سال: 1969
ISSN: 1883-8863
DOI: 10.4327/jsnfs1949.22.12