Cheeses are perishable foods that must fulfill sanitary and quality requirements according to the parameters established globally. Plasma as a nonthermal inactivation technique has been a current research topic for food preservation, so the objective of this work was to study the effect of plasma energy against microorganisms in Adobera cheese (traditional Mexican cheese) as well as evaluate the possible degradation of lipids and protein. 108 CFU/mL of Escherichia coli ATCC 25922, Salmonella ATCC13076, and Staphylococcus aureus ATCC 6538 were inoculated at 0.5 g of Adobera cheese and were subjected to an energy of 30 volts, in a dielectric barrier discharge reactor (DBDR) at intervals of times 1, 3, 5, 7, 10, and 15 min. A flow of a mixture of air and helium at 96% purity was used. The decimal reduction time (D) was determined, and the oxidation of proteins and lipids was analyzed after each treatment. The results showed an annihilating effect of plasma on the indicator bacteria under study, and a reduction of 5 logarithmic cycles was obtained. The maximum degree of lipid oxidation was 23 acid degree values (ADV) after 7 min of exposure to plasma. The oxidation of proteins showed a direct and proportional relationship between the formation of carbonyl groups with the percentage significant loss to the concentration of carbonyl groups with the concentration of protein oxidation, after 3 min of exposure to cold plasma levels of 82% and 99% oxidation of Adobera cheese protein and free casein, respectively. We conclude that the plasma energy applied to Adobera cheese is an effective treatment to inactivate bacteria. However, there is the possibility of causing changes in taste and odor, due to the release of fatty acids and the oxidation of proteins.
Human milk is the best food for newborns and infants for its combination of nutrients and biological complexity that allows the healthy grows and development of the infant. These components could be affected by thermic treatments of conservation as heat pasteurization, used in Human Milk Banks. The aim of this study was to evaluate the effects of different treatments applied to human milk in its biological activity (antiradical scavenging and anticancer properties). Human milk was heat pasteurized, also submitted high pressure and after it was spraydried. Moreover, of UV-C or γ-irradiation was applied on spray dried human milk. HT-29 cell line was used for testing antiproliferative assay. The results of this essay showed that 1.25 mg/mL of human milk treated with high pressures and spray dried can attain CI 50. Human milk powder treated with γ-irradiation showed the highest inhibition activity of HT-29 cell line, and the pasteurized and spray dried human milk presents the lowest inhibition activity (p<0.05). The highest percentage of scavenging activity against the superoxide anion was in spray-drying treated with γ-irradiation, showing significantly higher activity against the O 2 anion as compared to all other treatments tested (p<0.05), followed by human milk powder treated by UV-C irradiation, high pressure and heat pasteurization. Human milk powder treated by High pressure showed higher antioxidant activity, however, the value was not significantly higher as compared to the other pasteurization treatments evaluated (p > 0.05). Spray-dried human milk treated with high pressure, UV-C and γ-irradiation conserved its biological activity, thus it's could be possible to apply this technology in Human Milk Banks for conserving it.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.