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首页> 外文期刊>Ciencia Rural >Pseudomonas spp. and P. fluorescens: population in refrigerated raw milk.
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Pseudomonas spp. and P. fluorescens: population in refrigerated raw milk.

机译:假单胞菌P. fluorescens:冷藏生乳中的种群。

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Raw milk samples were collected from cooling tanks (after they cooled for 48 h) in five dairy farms and the corresponding bulk tank (bulk milk transportation, BMT) when they arrived to the industry. Routine physical chemical analyzes and quantification of psychrotrophic ( Pseudomonas spp. and P. fluorescens ) and aerobic mesophilic (AM) populations were performed. Only relative density and titratable acidity values for samples of milk from three farms were in agreement to the quality parameters required by law. In the BMT, only the protein content has not reached the minimum value established by law, and counting was performed for AM (>105 colony forming units (CFU) mL-1) and psychrotrophic bacteria (2.8x106CFU mL-1). Pseudomonas spp. counting corresponded to 17.9% of the psychrotrophic population, and P. fluorescens was 3.4% of Pseudomonas spp . count. In milk samples from dairy farms, counts were variable for AM (3.4x105 to 3.7 x107CFU mL-1), psychrotrophic (4.0x104 to 3.1x106CFU mL-1), Pseudomonas spp. (2.3x104 to 1.8x105CFU mL-1), and P. fluorescens (62 to 8.4x103CFU mL-1). For the populations studied, no statistical difference (P>0.05) was observed between counts reported in milk samples collected in dairy farms (cooling tanks) and BMT. Therefore, the genera Pseudomonas spp. and P. fluorescens were not the most frequent psychrotrophic bacteria in this studied milk transportation line.
机译:生牛奶样品从五个奶牛场的冷却罐(冷却48小时后)中收集,并在到达行业时从相应的散装罐(散装牛奶运输,BMT)中收集。进行了常规的物理化学分析,并对精神营养型(假单胞菌属和荧光假单胞菌)和有氧嗜温性(AM)人群进行了定量分析。只有来自三个农场的牛奶样品的相对密度和可滴定酸度值符合法律要求的质量参数。在BMT中,仅蛋白质含量尚未达到法律规定的最小值,并对AM(> 105个菌落形成单位(CFU)mL-1)和精神营养细菌(2.8x106CFU mL-1)进行计数。假单胞菌计数相当于精神营养型人群的17.9%,而荧光假单胞菌为假单胞菌的3.4%。计数。在奶牛场的牛奶样本中,AM(3.4x105至3.7 x107CFU mL-1),精神营养型(4.0x104至3.1x106CFU mL-1),假单胞菌的数量有所变化。 (2.3x104至1.8x105CFU mL-1)和荧光假单胞菌(62至8.4x103CFU mL-1)。对于所研究的人群,在奶牛场(冷却水箱)和BMT中收集的牛奶样品中报告的计数之间没有观察到统计学差异(P> 0.05)。因此,假单胞菌属。在研究的牛奶运输中,P。和荧光假单胞菌不是最常见的精神营养细菌。

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