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Effect of gamma-irradiation on the microbial inactivation, nutritional value, and antioxidant activities of infant formula

Robichaud, Valerie, Bagheri, Leila, Aguilar-Uscanga, Blanca Rosa, Millette, Mathieu et Lacroix, Monique ORCID: https://orcid.org/0000-0002-2042-4033 (2020). Effect of gamma-irradiation on the microbial inactivation, nutritional value, and antioxidant activities of infant formula LWT , vol. 125 , nº 109211. p. 1-7. DOI: 10.1016/j.lwt.2020.109211.

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Résumé

This study was aimed to assess the effect of gamma-irradiation (0 kGy, 5 kGy, and 10 kGy) on the microbial inactivation of selected pathogens (Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, Escherichia toll O157: H7, and Salmonella typhimurium), nutrient composition (lactose, protein, vitamin C, and fat quality), peptide profile, and antioxidant activities of a liquid formulation and powdered infant formula. Depending on the pathogens, the D-10 values (kGy) were range from 0.28-2.37 and 0.57-6.13 for liquid formulation and powdered samples, respectively. Results also showed that except for L. monocytogenes and S. typhimurium, all inoculated pathogens were more sensitive toward irradiation in the liquid formulation. Furthermore, irradiation treatment did not bring any significant alteration in lactose and protein content of both types of samples while antioxidant properties and vitamin C levels were affected when irradiated in liquid formulation. However, irradiated powdered samples showed a significant dose-dependent increment in lipid oxidation up to 10 kGy, which led to detect the greater level of malondialdehyde by thiobarbituric acid-reactive substances assay. A dose of 5 kGy favours the release of small molecular protein fraction which can have a positive effect on the nutritional value of the irradiated infant formula.

Type de document: Article
Mots-clés libres: Infant formula; Decontamination; Nutritional value; ɣ-irradiation
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 20 juill. 2021 21:28
Dernière modification: 15 févr. 2022 18:42
URI: https://espace.inrs.ca/id/eprint/11671

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