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Inactivation of Escherichia coli O157:H7 in vitro and on the surface of spinach leaves by biobased antimicrobial surfactants

文献类型： 外文期刊

作者： Zhang, Xuejie 1 ; Fan, Xuetong 2 ; Solaiman, Daniel K. Y. 2 ; Ashby, Richard D. 2 ; Liu, Zengshe 3 ; Mukhopadhyay, 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China

2.ARS, USDA, Eastern Reg Res Ctr, Wyndmoor, PA 19038 USA

3.ARS, USDA, Natl Ctr Agr Utilizat Res, Peoria, IL 61604 USA

4.Natl Engn & Technol Res Ctr Preservat Agr Prod, Tianjin 300384, Peoples R China

关键词： Biosurfactant;Sophorolipid;Thiamine dilauryl sulfate;Escherichia coli;Spinach

期刊名称：FOOD CONTROL （ 影响因子：5.548； 五年影响因子：5.498 ）

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收录情况： SCI

摘要： This study was conducted to evaluate the effect of biosurfactants on the populations of Escherichia coli O157:H7 in suspension and on spinach leaves. Eight surfactants including four soybean oil-based biosurfactants, sodium dodecyl sulfate (SDS), polyoxyethylene sorbitan monooleate (Tween 80), sophorolipid (SO) and thiamine dilauryl sulfate (TDS) at concentrations of 0.1%, 0.5% and 1.0% were tested in bacterial suspension, and the most effective biosurfactants were applied on spinach leaves. Results showed that the soybean oil-based biosurfactants, SDS or Tween 80 did not significantly affect E. coli O157:H7 populations. SO and TDS at concentrations of 1.0% were effective in reducing E. coli O157:H7 populations in bacterial suspension. E. coli O157:H7 with an initial population of 7.1 log CFU/mL was not detectable (detection limit: 1 log CFU/mL) after 1 min in 1.0% TDS or after 2 h in 1.0% SO. On spinach leaves, SO at 1% did not significantly affect E. coli when compared to a water wash during 7 days post-treatment storage at 4 degrees C. However, TDS (1.0%) wash was as effective as 200 ppm chlorine in reducing population of spot inoculated E. coli O157:H7, achieving 3.1 and 2.7 log CFU/per leaf at day 0, and 1.4 and 1.9 log CFU/leaf at day 7 when compared with a water wash. No apparent change in spinach visual quality was observed. None of treatments caused changes in visual quality of spinach. Electron micrographs suggested ultrastructural damage of bacterial cells such as separation of the outer membrane from the cytoplasmic membrane. Overall, our results showed that SO and TDS may be potential sanitizers in inactivating human pathogens such as E. coli O157:H7 in wash water and on fresh produce. Published by Elsevier Ltd.

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[1]Quality of fresh-cut Iceberg lettuce and spinach irradiated at doses up to 4 kGy. Fan, Xuetong,Sokorai, Kimberly J. B.,Guan, Wenqiang. 2012

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