Selective caffeine removal from green tea using supercritical carbon dioxide extraction
- Authors
- Kim, Wan-Joo; Kim, Jae-Duck; Kim, Jaehoon; Oh, Seong-Geun; Lee, Youn-Woo
- Issue Date
- Dec-2008
- Publisher
- ELSEVIER SCI LTD
- Keywords
- caffeine; EGCG (epigallocatechin gallate); green tea; solubility parameter; supercritical carbon dioxide; extraction
- Citation
- JOURNAL OF FOOD ENGINEERING, v.89, no.3, pp.303 - 309
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF FOOD ENGINEERING
- Volume
- 89
- Number
- 3
- Start Page
- 303
- End Page
- 309
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177616
- DOI
- 10.1016/j.jfoodeng.2008.05.018
- ISSN
- 0260-8774
- Abstract
- 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.
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