Trends of antibiotic resistance in mesophilic and psychrotrophic bacterial populations during cold storage of raw milk

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Munsch-Alatossava , P , Gauchi , J-P , Chamlagain , B & Alatossava , T 2012 , ' Trends of antibiotic resistance in mesophilic and psychrotrophic bacterial populations during cold storage of raw milk ' , ISRN Microbiology , vol. 2012 , no. Art. No. 918208 . https://doi.org/10.5402/2012/918208

Title: Trends of antibiotic resistance in mesophilic and psychrotrophic bacterial populations during cold storage of raw milk
Author: Munsch-Alatossava, Patricia; Gauchi, Jean-Pierre; Chamlagain, Bhawani; Alatossava, Tapani
Other contributor: University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition


Date: 2012
Language: eng
Number of pages: 13
Belongs to series: ISRN Microbiology
ISSN: 2090-7486
DOI: https://doi.org/10.5402/2012/918208
URI: http://hdl.handle.net/10138/258272
Abstract: Psychrotrophic bacteria in raw milk are most well known for their spoilage potential and cause significant economic losses in the dairy industry. Despite their ability to produce several exoenzyme types at low temperatures, psychrotrophs that dominate the microflora at the time of spoilage are generally considered benign bacteria. It was recently reported that raw milk-spoiling Gram-negative-psychrotrophs frequently carried antibiotic resistance (AR) features. The present study evaluated AR to four antibiotics (ABs), (gentamicin, ceftazidim, levofloxacin, and trimethoprim-sulfamethoxazole) in mesophilic and psychrotrophic bacterial populations recovered from 18 raw milk samples, after four days storage at 4°C or 6°C. Robust analysis of variance and non parametric statistics (e.g. REGW and NPS) revealed that AR prevalence among psychrotrophs, for milk samples stored at 4°C often equalled the initial levels, and equalled or increased during the cold storage at 6°C, depending on the AB.The study performed at 4°C with an intermediate sampling point at day 2 suggested that 1) different psychrotrophic communities with varying AR levels dominate over time and 2) that AR (determined from relative amounts) was most prevalent, transiently, after 2 days storage in psychrotrophic or mesophilic populations, most importantly at a stage where total counts were below or around 105 CFU/ml, at levels at which the milk is acceptable for industrial dairy industrial processes.
Subject: 416 Food Science
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