Antioxidant and antimicrobial activities of consecutive extracts from Galla chinensis:The polarity affects the bioactivities |
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Authors: | Fang Tian Bo Li Baoping Ji Jinhua Yang Guizhi Zhang Yang Chen Yangchao Luo |
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Affiliation: | 1. College of Food Science and Nutritional Engineering, China Agricultural University, Qinghua East Road 17, Haidian District, Beijing 100083, People’s Republic of China;2. Department of Biological Medicine, Zhongshan Torch Vocational and Technical College, Zhongshan 528436, People’s Republic of China |
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Abstract: | The gallotannins of Galla chinensis (GAC) were extracted consecutively by five solvents of different polarity, and the antioxidant and antimicrobial activities of the extracts were evaluated. All of the ether-, ethyl acetate-, ethanol-, and water-extracts presented remarkable antioxidant abilities in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, ferric reducing antioxidant power (FRAP), β-carotene linoleic acid system, and hydroxyl radical scavenging assays. The minimum inhibitory concentrations (MICs) of these extracts against 3 species of gram-positive bacteria, 3 species of gram-negative bacteria, and 3 species of fungi were also determined using the agar dilution method. All of the extracts showed excellent antibacterial activities, but no antifungal activities. The gallotannins in different extracts were analyzed by the HPLC and HPLC-ESI-MS. The results indicated that the extracts with weaker polarity contained gallotannins with higher molecular weight, and had stronger antioxidant and antibacterial activities. |
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Keywords: | BHT, butylated hydroxytolu DPPH, 1,1-diphenyl-2-picrylhydrazyl FRAP, ferric reducing antioxidant power GAC, Galla chinensis GG, galloylglucopyranose HRSA, hydroxyl radical scavenging activity MHA, Mueller-Hinton agar MIC, minimum inhibitory concentration NTP, non-tannin polyphenol PDA, potato dextrose agar TPP, total polyphenol TPTZ, 2,4,6-Tris(2-pyridyl)-s-triazine Trolox, 6-Hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid. |
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