Identification and structure–activity relationship of gallotannins separated from Galla chinensis

The gallotannins of Galla chinensis (Chinese gallotannins, CGTs) were identified using LC–MS, and their numbers of isomers in different extracts of Galla chinensis were determined. The antioxidant activities of CGTs with different degree of galloylation were evaluated in four antioxidant systems. Th...

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Bibliographic Details
Published in:Food science & technology 2009-09, Vol.42 (7), p.1289-1295
Main Authors: Tian, Fang, Li, Bo, Ji, Baoping, Zhang, Guizhi, Luo, Yangchao
Format: Article
Language:English
Subjects:
antibacterial properties
Antimicrobial activity
Antioxidant activity
antioxidants
beta-carotene
Biological and medical sciences
Chinese gallotannins
dose response
essential oils
Food industries
Food microbiology
free radical scavengers
free radicals
Fundamental and applied biological sciences. Psychology
Galla chinensis
herbal medicines
herbs
Identification
indigenous species
linoleic acid
medicinal plants
minimum inhibitory concentration
plant extracts
Rhus
structure-activity relationships
Structure–activity relationship
tannins
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Summary:The gallotannins of Galla chinensis (Chinese gallotannins, CGTs) were identified using LC–MS, and their numbers of isomers in different extracts of Galla chinensis were determined. The antioxidant activities of CGTs with different degree of galloylation were evaluated in four antioxidant systems. Their antioxidant activities increased with increasing number of galloyl groups in all four antioxidant tests. CGTs had a dose–response relationship at the low concentrations (15–60 μg/mL) in the β-carotene–linoleic acid system assay. The antibacterial activity of CGTs against Salmonella typhimurium (Gram negative) and Bacillus cereus (Gram positive) was assessed using the paper disc diffusion method. Hexa-hepta-galloylglucopyranoses (6–7GGs) showed the best antibacterial activities. In general, 6–7GGs possessed antioxidant and antibacterial activities greater than BHT, Trolox, or Ethylparaben. Moreover, an insight on the structure–activity relationship of CGTs is discussed.
ISSN:0023-6438
1096-1127
DOI:10.1016/j.lwt.2009.03.004