| dc.description.abstract | Fifteen different green tea products (BongHong, ThienHuong, TamChau,
LamBinhMinh, NganGiang, NgocTrang, ThuanAnhHoa, HongThai, RongVang,
TramAnh, DoHuu, LongVan, BaoTin, HuongKimThao, ThanhNgoc) sold in BaoLoc
city, LamDong province. We measured and compared the total phenolic compound,
and caffeine by spectrophotometry, the content of tannins by titration. In addition,
the antioxidant activity of the infusions was determined by spectrophotometry.
NganGiang brand and DoHuu brand showed better antioxidant and total phenolic
compound. The results obtained have shown that the caffeine content was
relatively high in all tea sample and ranged from 143 ± 2.65 (mg/g) in
HuongKimThao brand to 354.3 ± 2.65 (mg/g) in ThanhNgoc brand. The tannin
content was low generally and ranged between 180.8 ± 0.68 (mg/g) in BongHong
to 257.7 ± 0.98 in ThanhNgoc brand.
Key words:
Total phenolic compound
Caffeine
Tannin
Antioxidant contents
Green Tea | en_US |
