Shizuoka `M6-Ol33, lapan (-)-Epigallocatechin gallate yvas foulld to be the most efuctive scavenger among tea catechins for the superoxide anion, hydroxyl radical, and 1,1-diphenyl-2-picrylhydrazyl radical. Examinatien of the scayenging effects ef tea catechins and their glucosides on superoxide anioll showed that the presence of at least an ortho-dihydroxyl group in the B ring and a galloyl moiety at the 3 position was important in maintaining the effectiveness ef the radical scavenging ability. Stoichiometric factors of tea catechins were estimated to be 2 for (+)-catechin and (-)-epicatechin, 5 for (-)epigallocatechin, 7 for (-)-epicatechin gallate, and 10 for (-)-epigalloeatechin gallate.
It has been reported that L-lysine added to rice grains removes odor of aged brown rice by reacting with hexanal and other odoring compounds. Since stock of surplus rice carried over from previous crop years obtains peculiar odor that detracts from its eating quality and is becoming a serious problem, experiments were undertaken to fortify rice grains with L-lysine and to simultaneously remove odor and recover the eating quality.From chemical and sensory analysis data, it was demonstrated that 80% of added L-lysine was retained in cooked rice after cooked in an electric rice cooker, and that acceptability of aged rice samples was significantly improved by fortyfication with L-lysine except with high-grade samples.
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