Separation of catechins from green tea using carbon dioxide extraction
Separation of catechins from green tea using carbon dioxide extraction
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DOI：
10.1016/s0308-8146(99)00176-4
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发表时间：
2000-01-01
期刊：
影响因子：
8.8
通讯作者：
Chang, CY
中科院分区：
文献类型：
--
作者：
Chang, CMJ;Chiu, KL;Chang, CY
本研究提出了一种新型的填充柱萃取器与吸收系统相结合，以提高绿色茶精油的质量，使用高压二氧化碳萃取。还考察了各种共溶剂对萃取物的影响。此外，重量测量和HPLC色谱分析分别确定精油的量和四种主要儿茶素的浓度。结果表明，加入95%乙醇的提取物中的平均含量是加入水的4.4倍。索氏提取法中多酚与咖啡因的比例最高。(C)1999爱思唯尔科技有限公司。保留所有权利。
This study presents a novel packed-column extractor coupled with an absorption system to improve the quality of green tea essential oils, extracted by using high pressure carbon dioxide. The effects of various co-solvents on the extract are also examined. In addition, gravimetric measurement and HPLC chromatographic analyses individually determine the amount of essential oil and the concentration of four major catechins. Results show that the mean contents in the extract are 4.4-fold higher by addition of 95% ethanol than by addition of water. The ratio of polyphenols to caffeine is highest in the Soxhlet ethanol extraction. (C) 1999 Elsevier Science Ltd. All rights reserved.