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  1. Article ; Online: Metabolites and metagenomic analysis reveals the quality of Pu-erh "tea head".

    He, Shiqiang / Deng, Xinyi / Han, Yuxin / Gong, Zhengli / Wang, Jian / Tao, Xiaoqi / Tong, Huarong / Chen, Yingjuan

    Food chemistry

    2023  Volume 429, Page(s) 136992

    Abstract: Tea head, a derivative product of Pu-erh tea, are tight tea lumps formed during pile-fermentation. The aim of this study was to reveal the differences of quality-related metabolites and microbial communities between ripened Pu-erh tea (PE-21) and tea ... ...

    Abstract Tea head, a derivative product of Pu-erh tea, are tight tea lumps formed during pile-fermentation. The aim of this study was to reveal the differences of quality-related metabolites and microbial communities between ripened Pu-erh tea (PE-21) and tea heads (CT-21). Compared with PE-21, CT-21 showed a more mellow and smooth taste with slight bitterness and astringency, and can withstand multiple infusions. Metabolites analysis indicated CT-21 had more abundant water-soluble substances (47.39%) and showed significant differences with PE-21 in the main compositions of amino acids, catechins and saccharides which contributed to the viscosity of tea liquor, mellow taste and the tight tea lumps formation. Microbial communities and COG annotation analysis revealed CT-21 had lower abundance of Bacteria (84.05%), and higher abundance of Eukaryota (15.10%), carbohydrate transport and metabolism (8.28%) and glycoside hydrolases (37.36%) compared with PE-21. The different microbial communities may cause metabolites changes, forming distinct flavor of Pu-erh.
    MeSH term(s) Tea/chemistry ; Microbiota ; Bacteria/genetics ; Catechin ; Fermentation
    Chemical Substances Tea ; Catechin (8R1V1STN48)
    Language English
    Publishing date 2023-07-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 243123-3
    ISSN 1873-7072 ; 0308-8146
    ISSN (online) 1873-7072
    ISSN 0308-8146
    DOI 10.1016/j.foodchem.2023.136992
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 3634: Show issues

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  2. Article: [Advance in anticancer studies on catechins and their derivatives].

    Zhou, Jie / Gong, Zheng-li / Zhang, Kai / Ding, Yang-ping

    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica

    2012  Volume 37, Issue 17, Page(s) 2510–2518

    Abstract: Experimental studies on animals discovered that catechins have a notable inhibitory effect on the formation and development of tumors in different organs. Studies on their mechanism showed that catechins could inhibit cancer cell invasion and ... ...

    Abstract Experimental studies on animals discovered that catechins have a notable inhibitory effect on the formation and development of tumors in different organs. Studies on their mechanism showed that catechins could inhibit cancer cell invasion and proliferation, angiogenesis and metastasis and induce cancer cell apoptosis through anti-oxidation and by inhibiting related enzyme activities and cancer cell signal transmission. This essay provides an overview of correlation between tea drinking and cancer prevention, various mechanisms of catechins and their derivatives such as biochemical cancer prevention and anticancer and looks into the future of catechins.
    MeSH term(s) Animals ; Antineoplastic Agents, Phytogenic/chemistry ; Antineoplastic Agents, Phytogenic/pharmacology ; Catechin/chemistry ; Catechin/pharmacology ; Humans ; Neoplasms/drug therapy ; Neoplasms/metabolism ; Neoplasms/prevention & control ; Plant Extracts/chemistry ; Plant Extracts/pharmacology ; Signal Transduction/drug effects
    Chemical Substances Antineoplastic Agents, Phytogenic ; Plant Extracts ; Catechin (8R1V1STN48)
    Language Chinese
    Publishing date 2012-09
    Publishing country China
    Document type English Abstract ; Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1004649-5
    ISSN 1001-5302 ; 0254-0029
    ISSN 1001-5302 ; 0254-0029
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3056: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  3. Article: PARTIAL PROPERTIES OF POLYPHENOL OXIDASE IN MANGO (MANGIFERA INDICA L. CV. "TAINONG") PULP

    WANG, JIANHUI / JIANG, WEIBO / WANG, BAOGANG / LIU, SHIJIAN / GONG, ZHENGLI / LUO, YUNBO

    Journal of food biochemistry. 2007 Feb., v. 31, no. 1

    2007  

    Abstract: The properties of polyphenol oxidase (PPO, EC 1.14.18.1) from an extract of mango pulp were studied. PPO, with catechol as substrate, had an optimum pH at 7.0 and optimum temperature at 30C. PPO showed activity with dihydroxyphenols and trihydroxyphenols, ...

    Abstract The properties of polyphenol oxidase (PPO, EC 1.14.18.1) from an extract of mango pulp were studied. PPO, with catechol as substrate, had an optimum pH at 7.0 and optimum temperature at 30C. PPO showed activity with dihydroxyphenols and trihydroxyphenols, but not with monohydroxyphenols. Kinetic parameters maximum velocity and Michaelis constant for PPO were 256.28 U/min and 6.30 mM with catechol, and 199.61 U/min and 47.81 mM with pyrogallol. The activity of PPO was well retained after heating the extract for 15 min at 50C, and 98% of the activity was lost after the extract was heated for 5 min at 80C. PPO was effectively inhibited by ascorbic acid as well as by β-mercaptoethanol and L-cysteine, and was enhanced by sodium dodecyl sulfate.
    Keywords Mangifera indica ; ascorbic acid ; catechol ; catechol oxidase ; mango pulp ; mangoes ; monophenol monooxygenase ; pH ; pyrogallol ; sodium dodecyl sulfate ; temperature
    Language English
    Dates of publication 2007-02
    Size p. 45-55.
    Publisher Blackwell Publishing Inc
    Publishing place Malden, USA
    Document type Article
    ZDB-ID 433846-7
    ISSN 1745-4514 ; 0145-8884
    ISSN (online) 1745-4514
    ISSN 0145-8884
    DOI 10.1111/j.1745-4514.2007.00097.x
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 3310: Show issues

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