Chia Nan University of Pharmacy & Science Institutional Repository:Item 310902800/22214
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 17775/20116 (88%)
Visitors : 8989355      Online Users : 215
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/22214


    Title: Antimutagenic and antimicrobial activities of pu-erh tea
    Authors: She-Ching Wu
    Gow-Chin Yen
    Bor-Sen Wang
    Chih-Kwang Chiu
    Wen-Jye Yen
    Lee-Wen Chang
    Pin-Der Duh
    Contributors: 食品科技系
    生活應用與保健系
    Keywords: Pu-erh tea
    Antimutagenic activity
    Antimicrobial activity
    Caffeine
    Epicatechin
    Date: 2007-04
    Issue Date: 2010-01-15 10:18:43 (UTC+8)
    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.
    Relation: LWT - Food Science and Technology 40(3): p.506-512
    Appears in Collections:[Dept. of Food Science & Technology] Periodical Articles
    [Dept. of Applied Life Science and Health] Periodical Articles

    Files in This Item:

    File SizeFormat
    0KbUnknown1510View/Open


    All items in CNU IR are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback