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[Lecithin influence on the effectiveness of the antioxidant effect of flavonoids and alpha-tocopherol].

Prikladnaia biokhimiia i mikrobiologiia (2010-04-16)
L I Mazaletskaia, N I Sheludchenko, L N Shishkina
ABSTRACT

Influence of the widely used food supplement lecithin on the effectiveness of the inhibiting effect of the natural antioxidants (quercitin, dihydroquercitin, and alpha-tocopherol) has been studied in dependence of the rate of free radicals generation in the model oxidation reactions. It has been found that during the initiated and autoxidation of methyl oleat, lecithin decreased the antioxidant effectiveness of flavonoids. The effect value increased with the lecithin concentration increase. In similar conditions while oxidation inhibiting by alpha-tocopherol and lecithin mixtures, the latter did not influence the tocopherol antioxidant effectiveness (additivity) or led to the increase of the inhibition effectiveness (synergism).

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Methyl oleate, 99%
Supelco
Methyl oleate, analytical standard
Sigma-Aldrich
Methyl oleate, technical grade, 70%
Sigma-Aldrich
Methyl elaidate, ≥99% (capillary GC)
Supelco
cis-9-Octadecenoic acid methyl ester, certified reference material, 10 mg/mL in heptane
Supelco
Methyl elaidate, analytical standard