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Changes in microbial flora of Pacific oysters (Crassostrea gigas) during refrigerated storage and its shelf-life extension by chitosan

文献类型: 外文期刊

作者: Cao, Rong 1 ; Xue, Chang-hu 1 ; Liu, Qi 2 ;

作者机构: 1.Ocean Univ China, Dept Food Sci & Technol, Coll Food Sci & Engn, Qingdao 266003, Shandong, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266003, Shandong, Peoples R China

关键词: Pacific oyster;Microbial flora;Chitosan;Shelf-life

期刊名称:INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY ( 影响因子:5.277; 五年影响因子:5.388 )

ISSN: 0168-1605

年卷期: 2009 年 131 卷 2-3 期

页码:

收录情况: SCI

摘要: Changes in microbial flora of Pacific oysters (Crassostrea gigas) during storage at 5 +/- 1 degrees C were analyzed and the antimicrobial activity of chitosan was studied to identify its potential in shelf-life extension. The dominant microorganisms were found to be Pseudomonas (22%) and Vibrionaceae (20%) in raw oysters. During storage, proportion of Pseudomonas increased significantly and reached 73% at the end of storage, while Vibrionaceae preserved a level of approximate 20%. Wide-spectrum antibacterial property of chitosan against the bacteria isolated from oysters was discovered, and chitosan concentration of 5.0 g/L was eventually determined for application in oyster preservation. Based on microbiological analysis, biochemical indices determination and sensory evaluation, shelf-life of oysters stored at 5 +/- 1 degrees C was determined. Data showed that chitosan treatment extended the shelf-life of oysters from 8-9 days to 14-15 days. (C) 2009 Elsevier B.V. All rights reserved.

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