Selective caffeine removal from green tea using supercritical carbon dioxide extraction

被引:109
作者
Kim, Wan-Joo [1 ,2 ]
Kim, Jae-Duck [1 ]
Kim, Jaehoon [1 ]
Oh, Seong-Geun [2 ]
Lee, Youn-Woo [3 ]
机构
[1] Korea Inst Sci & Technol, Energy & Environm Res Div, Seoul 136791, South Korea
[2] Hanyang Univ, Div Chem & Bioengn, Seoul 133791, South Korea
[3] Seoul Natl Univ, Div Chem & Biol Engn, Seoul 151744, South Korea
关键词
caffeine; EGCG (epigallocatechin gallate); green tea; solubility parameter; supercritical carbon dioxide; extraction;
D O I
10.1016/j.jfoodeng.2008.05.018
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Caffeine and EGCG (epigallocatechin gallate) were extracted from green tea using supercritical carbon dioxide (SCCO2) with water as a cosolvent. Experimental conditions were carefully chosen to selectively extract a large amount of caffeine from the green tea while to remain a large amount of EGCG in the green tea. Various experimental conditions were explored including temperatures ranging 40-80 degrees C, pressure ranging 200-400 bar, and water contents ranging 4-7 wt%. At 40 degrees C, 400 bar and the water content of 7 wt%, the caffeine extraction yield was 54% while the EGCG extraction yield was 21%, resulting in caffeine/EGCG extraction selectivity of 2.57. The larger caffeine extraction yield agreed well with estimation of solubility parameter differences between SCCO2/water and caffeine/EGCG. The extraction results using SCCO2/water were compared with conventional liquid solvent extraction using water or ethanol. The selectivity of caffeine/EGCG extraction with water was 0.88 and the selectivity of caffeine/EGCG extraction was 0.24 with ethanol. Thus SCCO2 extraction with water as a cosolvent is suitable for the selective extraction of caffeine from the green tea. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:303 / 309
页数:7
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