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Effect of supercritical carbon dioxide decaffeination on volatile components of green teas

Title
Effect of supercritical carbon dioxide decaffeination on volatile components of green teas
Authors
Lee S.Park M.K.Kim K.H.Kim Y.-S.
Ewha Authors
김영석
SCOPUS Author ID
김영석scopus
Issue Date
2007
Journal Title
Journal of Food Science
ISSN
0022-1147JCR Link
Citation
vol. 72, no. 7, pp. S497 - S502
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Volatile components in regular and decaffeinated green teas were isolated by simultaneous steam distillation and solvent extraction (SDE), and then analyzed by GC-MS. A total of 41 compounds, including 8 alcohols, 15 terpene-type compounds, 10 carbonyls, 4 N-containing compounds, and 4 miscellaneous compounds, were found in regular and decaffeinated green teas. Among them, linalool and phenylacetaldehyde were quantitatively dominant in both regular and decaffeinated green teas. By a decaffeination process using supercritical carbon dioxide, most volatile components decreased. The more caffeine was removed, the more volatile components were reduced in green teas. In particular, relatively nonpolar components such as terpene-type compounds gradually decreased according to the decaffeination process. Aroma-active compounds in regular and decaffeinated green teas were also determined and compared by aroma extract dilution analysis (AEDA). Most greenish and floral flavor compounds such as hexanal, (E)-2-hexenal, and some unknown compounds disappeared or decreased after the decaffeination process. © 2007 Institute of Food Technologists.
DOI
10.1111/j.1750-3841.2007.00446.x
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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