✦ LIBER ✦

Comparative Study and Partial Characterization of Azorean Green Tea Polyphenols

✍ Scribed by Jose A.B. Baptista; Joaquim F. da P Tavares; Rita C.B. Carvalho

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 383 KB
Volume: 12
Category: Article
ISSN: 0889-1575
DOI: 10.1006/jfca.1999.0829

No coin nor oath required. For personal study only.

✦ Synopsis

Tea is grown in about 30 countries, including Azores Islands, and is the most widely consumed beverage worldwide. Green tea polyphenols (GTP) are the major water-soluble components in a cup of tea (Camellia sinensis (L.) O. Kuntze). The content of the Azorean GTP was determined by RP-HPLC with UV detection and compared with that of di!erent origin samples. The Azorean GTP extraction yield was also determined using di!erent extraction times from 10 to 60 min at 703C, and also at di!erent temperatures from 50 to 1003C, at a constant extraction time of 40 min. Quantitative determination of the total epicatechin derivatives and epigallocatechin gallate (EGCG) of di!erent green teas were also compared with that of Azorean green tea. The EGCG : ca!eine ratio was high in Azorean green tea as compared with others, which suggested a good source of a chemopreventive agent. The aroma of di!erent green tea samples were compared using the SPME/GC-headspace methodology.

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