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Effect of UV-A on the Linolenic Acid Micelles

Biplab Bose and S. N. Chatterjee
Radiation Research
Vol. 133, No. 3 (Mar., 1993), pp. 340-344
DOI: 10.2307/3578219
Stable URL: http://www.jstor.org/stable/3578219
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of UV-A on the Linolenic Acid Micelles
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Abstract

UV-A produced a dose-dependent linear increase of peroxidation in linolenic acid micelles as detected by the assay of (i) conjugated dienes, (ii) hydroperoxides, (iii) malondialdehyde (MDA), and (iv) the fluorescent adduct formed by the reaction of MDA with the amino acid, glycine. While sodium formate, dimethyl sulfoxide, superoxide dismutase, and ethylenediamine-tetraacetic acid produced no significant inhibition, some generally used singlet oxygen quenchers, β-carotene, dimethylfuran, L-histidine, and sodium azide, caused significant inhibition of the UV-A-induced peroxidation of the linolenic acid micelles. α-Tocopherol and butylated hydroxytoluene produced more than 90% inhibition of the UV-A-induced peroxidation. ESR spectrometry revealed the formation of 2,2,6,6-tetramethylpiperidine oxide in the UV-A-irradiated aqueous solution of 2,2,6,6-tetramethylpiperidine. The involvement of singlet oxygen $({}^{1}{\rm O}{}_{2})$ in the UV-A-induced peroxidation of linolenic acid micelles is discussed.

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