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| 9-08-2008 |
Dr. Paul's Tea & Health Update |
#89a |
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WILL OOLONG TEA CONTAIN AS MUCH EGCG AS GREEN TEA?
A previous study (88b) suggested that partially fermented (oxidized) tea (e.g., oolong) is likely to contain
half of the EGCG as unfermented tea (e.g. green). Nevertheless, fermentation level is highly variable in oolong teas. Also,
many oolong teas (typically called "old oolong teas") are heated (roasted) as part of the flavor enhancement manufacturing
process. Oolong teas not heated or roasted are often called "young oolong teas." The following study examines the changes
that take place in oolong tea compounds that take place during these intense heating processes.
Massive Accumulation of Gallic Acid and Unique Occurrence of Myricetin, Quercetin, and Kaempferol in Preparing Old Oolong Tea.
J Agric Food Chem. 2008 Aug 16. Lee VS, et.al.
Click Here for PubMed Abstract of Study
One of the findings of this study was that there was:
"significant lower (-)-epigallocatechin gallate (EGCG) but higher gallic acid contents�detected in the old teas compared to the new one."
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awareness. - Copyright © 2008 Dr. Paul's School of Tea and Health, LLC.
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