期刊
LWT-FOOD SCIENCE AND TECHNOLOGY
卷 41, 期 10, 页码 2029-2035出版社
ELSEVIER
DOI: 10.1016/j.lwt.2008.01.017
关键词
Nephelium lappaceum; Antioxidant; Antibacterial; Phenolics
资金
- Thailand Research Fund (TRF)
- Department of Chemistry, Faculty of Science and Graduate School, Chiang Mai University, Thailand
Ether, methanolic and aqueous extracts of lyophilized rambutan (Nephelium lappaceum L.) peels and seeds were evaluated for phenolic contents, antioxidant and antibacterial activities. High amounts of phenolic compounds were found in the peel extracts and the highest content was in the methanolic fraction (542.2 mg/g dry extract). Several potential antioxidant activities, including reducing power, beta-carotene bleaching, linoleic peroxidation and free radical scavenging activity, were evaluated. The peel extracts exhibited higher antioxidant activity than the seed extracts in all methods determined (P < 0.05). The methanolic fraction was found to be the most active antioxidant as shown by their 50% DPPH center dot inhibition concentration, 4.94 mu g/mL. The results indicated this fraction exhibited greater DPPH center dot radical scavenging activity than BHT and ascorbic acid (0.32 g dry extract/g BHT or ascorbic acid). Antibacterial activity against eight bacterial strains was assessed by disc diffusion and broth macrodilution methods. All peel extracts exhibited antibacterial activity against five pathogenic bacteria. The most sensitive strain, Staphylococcus epidermidis, was inhibited by the methanolic extract (MIC 2.0 mg/mL). (C) 2008 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.
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