Effect of Heat Treatment on the Lipophillic Pigments of Fresh Green Tea Liquor
文献类型: 外文期刊
第一作者: Lu, Jian-Liang
作者: Lu, Jian-Liang;Dong, Zhan-Bo;Pan, Shun-Shun;Lin, Chen;Zheng, Xin-Qiang;Devajit, Borthakur;Liang, Yue-Rong;Pan, Shun-Shun;Devajit, Borthakur
作者机构:
关键词: fresh green tea liquor;heat treatment;lipophillic pigment;color difference;metal ion addition
期刊名称:FOOD SCIENCE AND BIOTECHNOLOGY ( 影响因子:2.391; 五年影响因子:2.108 )
ISSN: 1226-7708
年卷期: 2009 年 18 卷 3 期
页码:
收录情况: SCI
摘要: Changes in lipophillic pigments concentration and its relation to color of fresh green tea liquor during heat treatment were studied. The results showed liquor greenness decreased markedly with extension of incubation time at 55 degrees C, while the brightness and yellowness changed a little. Significant increase in 'a' and 'b' values of tea liquor was observed at 95 degrees C. Color change of liquor at 55 degrees C was accompanied by a decrease in the level of chlorophylls, lutein and neoxanthin, and an increase in the pheophytins and beta-carotene levels. However, all pigments except beta-carotene decreased with time extension at 95 degrees C. Significant correlation was found between pigments and color difference index. The browning of fresh green tea liquor was attributed to vicissitudes of lipophillic pigments during heat treatment, especially to the change of chlorophylls/pheophytins ratio. Result also showed addition of Zn(2+) at 1.6 mu mol/L could partially alleviate the decrease in greenness during heat treatment.
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