- UID
- 18
- 帖子
- 2004
- 主題
- 13
- 在線時間
- 2360 小時
- 註冊時間
- 2010-7-18
- 最後登錄
- 2018-3-13
|
192樓
發表於 2012-7-3 00:21
| 只看該作者
再貼一個論文
這個論文是咱們嘉義大學發表的,主題是普洱茶的抗誘變和抗菌性
Abstract
The biological action of water extract of pu-erh tea (WEPT) was evaluated by Salmonella mutagenesis assay and bacteria test. Like
green tea, oolong tea and black tea, WEPT showed neither cytotoxicity and nor mutagenicity toward Salmonella typhimurium TA98 and
TA100 with or without S9 mix (an external metabolic activation system). WEPT at 0.5–5 mg/plate expressed a dose-dependent inhibitory
effect against both the mutagenicity of aflatoxin B1 (AFB1), an indirect mutagen which requires metabolic activation, and 4-
nitroquinoline-N-oxide (NQNO), a direct mutagen, in Salmonella typhimurium TA98 and TA100. In general, the antimutagenic activity
of WEPT against AFB1 and NQNO was weaker than other tea extract because of the least amount of total catechin in WEPT. For
antimicrobial action, WEPT, green tea, oolong tea and black tea at 2.0 mg/ml showed inhibitory effect on growth of Staphylococcus
aureus and Bacillus subtilis, but no effect on Escherchia coli. Obviously, WEPT has potential antimicrobial effect on gram-positive
Staphylcoccus aureus and B. subtilis than that of gram-negative E. coli. In addition, caffeine and epicatechin (EC), main polyphenolic
compounds in WEPT, showed both antimutagenic and antimicrobial effect against strains mentioned above, which may partially
account for the antimutagenic and antimicrobial action of pu-erh tea.
r 2005 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved. |
附件: 您需要登錄才可以下載或查看附件。沒有帳號?註冊
-
1
評分人數
-
|