Effects of the Cold Atmospheric Plasma Treatment Technology on Staphylococcus Aureus and Escherichia Coli Populations in Raw Milk
Publish place: Journal of Nutrition, Fasting and Health، Vol: 9، Issue: 4
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JNFH-9-4_005
تاریخ نمایه سازی: 22 فروردین 1401
Abstract:
Today, various sterilization methods are used for the removal of microorganisms, some of which are based on thermal methods that have negative effects on the physicochemical properties of milk. The present study aimed to investigate the effects of cold plasma at atmospheric pressure on the population of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) in raw milk. Initially, a plasma jet filled with argon gas was used to evaluate the antibacterial effects of cold plasma. Following that, pasteurized milk samples (۱.۵% and ۳% fat) were infected with standard strains of E. coli and coagulase-positive S. aureus and irradiated with cold plasma at the frequency of ۲۲, ۲۸, and ۳۳ kHz and voltage of ۲۰, ۱۲.۵, and ۱۰ kV for five minutes. The results of statistical analysis and Tukey’s test indicated that the E. coli and S. aureus microbial load was significantly lower in the ۱.۵% fat milk compared to the control group (P<۰.۰۵). In addition, the milk samples exposed to plasma at ۲۰ kV and ۲۸ kHz showed the most significant reduction in the number of E. coli bacteria compared to the control samples (P<۰.۰۵). The milk samples exposed to ۱۰ kV and ۳۳ kHz also showed the most significant reduction in the S. aureus microbial load. According to the results, cold plasma could decrease the microbial load of milk containing ۱.۵% fat more significantly compared to the ۳% fat milk. Therefore, plasma could be a proper alternative to thermal decontamination methods for raw milk. However, its application requires further studies to determine the intensity and duration of the exposure of microorganisms to cold plasma at atmospheric pressure.
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Authors
Mahnoosh Bahreini
Department of Food Hygiene, Faculty of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Seyed Amirali Anvar
Department of Food Hygiene, Faculty of Veterinary Medicine, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Bahareh Nowruzi
Department of Biology, Faculty of Converging Sciences and Technologies, Islamic Azad University, Science and Research Branch, Tehran, Iran
Amir Hossein Sari
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran
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