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Effect of glucose, pH and lactic acid on Carnobacterium maltaromaticum, Brochothrix thermosphacta and Serratia liquefaciens within a commercial heat-shrunk vacuum-package film

机译:葡萄糖,pH和乳酸对麦芽族种族碳钾,Brochotrix Thermosphotta和Serratia Liquefaciens的影响

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摘要

Carnobacterium maltaromaticum, Brochothrix thermosphacta and Serratia liquefaciens are common spoilage organisms found within the microbiome of refrigerated vacuum-packaged (VP) beef. Extending and predicting VP beef shelf-life requires knowledge about how spoilage bacteria growth is influenced by environmental extrinsic and intrinsic factors. Multifactorial effects of pH, lactic acid (LA) and glucose on growth kinetics were quantified for C. maltaromaticum, B. thermosphacta and S. liquefaciens within a heat shrink-wrapped VP commercial film containing a simulated beef medium. LA, pH, and undissociated lactic acid (UDLA) significantly affected bacterial growth rate (p < 0.001), whereas 5.55 mM glucose produced a marginal effect. At 1.12 mM UDLA, growth rate and maximum population density decreased 20.9 and 3.5%, 56 and 7%, and 11 and 2% for C. maltaromaticum, B. thermosphacta, and S. liquefaciens, respectively.
机译:麦芽族毒素,Brochothrix Thermosphotta和Serratia Liquefaciens是在冷藏真空包装(VP)牛肉的微生物组中发现的常见腐败生物。延伸和预测VP牛肉质子生活需要了解腐败细菌的生长受环境外在和内在因素的影响。对于C.Maltaromaticum,B.的热缩包裹的VP商业膜,量化pH,乳酸(La)和葡萄糖对生长动力学对生长动力学的葡萄球菌的多因素效应。 La,pH和未加入的乳酸(UDLA)显着影响细菌生长速率(P <0.001),而5.55mm葡萄糖产生了边际效果。在1.12mm的UDLA,生长速率和最大种群密度分别降低20.9和3.5%,56%和7%,C.Maltaromaticum,B. Thermosphotta和S. Liquefaciens的11%和2%。

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