Atypical Spoilage Microorganisms in Argentinean Yogurts: Gas-Producing Molds and Bacteria of the Genus Gluconobacter

Journal: Advances in Medicine and Engineering Interdisciplinary Research DOI: 10.32629/ameir.v2i2.2019

María Luján Capra1, Laura N. Frisón2, Carolina Chiericatti2, Ana G. Binetti1, Jorge A. Reinheimer1

1. Institute of Industrial Lactology (UNL-CONICET), School of Chemical Engineering, Universidad Nacional del Litoral, Santiago del Estero, Santa Fe, Argentina.
2. Chair of Microbiology, Department of Food Engineering and Biotechnology, School of Chemical Engineering, Universidad Nacional del Litoral, Santiago del Estero, Santa Fe, Argentina.

Abstract

Microbiological spoilage of food leads to products unfit for consumption, and their discarding leads to significant economic losses for the food industry. During storage, fresh foods offer available niches for the survival and growth of undesirable microorganisms. In dairy products, data regarding spoilage and/or pathogenic bacteria is better documented than those for molds and yeasts. Dairy products, due to their refrigerated storage and production from heat-treated milk, are less susceptible to mold contamination compared to fruits and vegetables. The dominant microbiota in fermented dairy products also contributes to acidifying the medium, further reducing the risk of spoilage. However, even cheeses and yogurts may be susceptible to mold contamination. Atypical cases of yogurt samples containing spoilage microorganisms not previously reported (molds producing gas and bacteria of the genus Gluconobacter) in Argentinean fermented milks are presented here. For yogurt, in particular, the "classic" altering organisms were always being yeasts, and in other countries, molds belonging to the genus aspergillus.

Keywords

spoilage microorganisms; yogurt; gas-producing molds; mucorales; gluconobacter

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