Impact of ultrasound treatment on viability of Staphylococcus aureus and the human milk antioxidant activity

Abstract

This study aimed to evaluate the application of thermosonication for the viability of Staphylococcus aureus and the antioxidant activity of HM. The US effect on the S. aureus was measured by counting viable cells in discarded HM immediately before and after different treatments varying time (1, 5 and 10 minutes) and temperature (20, 30, 40, 50 and 60 °C) through surface plating on standard agar. The antioxidant activity evaluation was carried out by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) scavenging method. With Regarding microbiological quality, it can be concluded that treatment with US at 60 °C for 10 minutes was the most effective in terms of reducing the viability of S. aureus, in addition to presenting a significant increase in the content of antioxidants when compared to raw and pasteurized milk samples.

A comparative study on the effects of boiling and ultrasonication on radical scavenging activity, casein particle size, and whiteness of milk

“…In our study, it was observed that both heat treatment and ultrasonication treatment reduced the radical scavenging activities of milk. Several previous studies have reported that heat treatment reduced the radical scavenging activities of milk [ 18 ]. Casein has an effective role against lipid peroxidation and in radical scavenging activity [ 7 , 8 , 19 ].…”

Antimicrobial activity of oridonin

“…Owing to antibiotic overuse in the medical, fishery, and livestock and poultry breeding industry, several antibioticresistant bacteria, such as methicillin-resistant Staphylococcus aureus (MRSA), multidrug-resistant Streptococcus pneumoniae (MDRSP), and vancomycin-resistant Enterococcus (VRE) have emerged, posing new challenges to food hygiene and safety and efficacy of medicines (Gomes et al, 2022;Kim & Ahn, 2022;Le et al, 2022). To overcome the challenges posed by the increasing emergence of drug-resistant bacteria and their strong environmental adaptability, researchers are using a combination of antibiotics to treat bacterial infections (Beardmore et al, 2017;Li et al, 2022b;Pabon et al, 2022).…”