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《Journal of Hygiene Research》 2002-04
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Studies on the stabilities of bioactive selenocompounds in selenium-enriched garlic and onion

Yang Wenjie Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, Beijing 100050, China  
It is reported that selenium (Se) incorporation into garlic increases the bioactivities of garlic. Hence, the chemical changes of selenocompounds during processing and storage will influence the bioactive effectiveness of Se-enriched garlic. The principal selenocompounds in Se-enriched garlic are water-soluble,and several comparative experiments are thus conducted to examine the stabilities of the selenocompounds in water extracts of Se-enriched garlic and Se-enriched onion. The results show that preparing the garlic powder by freeze-drying technique can maintain the chemical properties of the selenium compounds in Se-enriched garlic. Se-methyl-selenocysteine is unstable in water extract of Se-enriched garlic when the extract is prepared and stored at room temperature. Specific alliinase inhibitor hydroxylamine (NHOH·HCl) effectively prevents the loss of Se-methyl-selenocysteine, which suggests that the decomposition of Se-methyl-selenocysteine may be catalyzed by alliinase. Se-methyl-selenocysteine is one of the main bioactive selenocompounds in Se-enriched garlic. The procedures of processing and storage should be carefully chosen to prevent the loss of selenocompounds and the decrease of the bioactivity of Se-enriched garlic. Se-enriched onion also contains alliinase and Se-methyl-selenocysteine, but its Se-methyl-selenocysteine is proved to be stable in the same water extract as that of Se-enriched garlic. The stability differences of Se-methyl-selenocysteine in Se-enriched garlic and onion, the mechanism of selenocompound decomposition and the bioactivities of decomposed compounds in Se-enriched garlic need to be further studied.
【CateGory Index】: Q946
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