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Effect of selenium on preservation quality of green tea during autumn tea-processing season.

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Selenium-enriched green tea leaves were prepared by foliar applications of selenium-amended fertilizer during autumn season. The influence of selenium (Se) on preservation quality of tea during 4-month storage was determined. The results showed that the Se and vitamin C contents of green tea were significantly increased by selenium spraying during the autumn tea-producing season. The vitamin C content of Se-enriched green tea was higher and its decline was significantly slower during storage compared to normal green tea. However, there was no significant difference between the contents of chlorophyll and polyphenol of Se-enriched and regular tea. During the first 60 days, the color of green tea extract in Se-enriched green tea and normal tea showed no significant difference. However, the color of green tea extract in Se-enriched green tea was more stable compared with normal tea during the storage period. The sweetness and aroma of extracts of Se-enriched green tea were also significantly higher than that of normal tea and the bitterness of extracts of Se-enriched green tea was significantly lower compared with normal tea. These results showed that selenium application can slow the reduction of tea's major component and thus improve preservation qualities of green tea. Publication Types: Research Support, Non-U.S. Gov't

Keywords: enriched green, with normal, compared with, showed that, results showed, significant difference, enriched, selenium, normal, significantly, compared, showed, storage

Authored by Huang Y, Xu J, Hu Q. Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, People's Republic of China.

Published in J Agric Food Chem. 2005 Sep 21;53(19):7444-7. The full report is available online. link   A subscription to the periodical may be required.

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