title: Formation of lysine-derived oxidation products and loss of tryptophan during processing of porcine patties with added avocado byproducts.
abstract: The effects of the addition of avocado oil and a phenolic-rich avocado peel extract on protein oxidation were studied in porcine patties subjected to cooking and chilled storage. Protein oxidation was assessed by means of tryptophan loss and the formation of specific lysine oxidation products, such as α-aminoadipic semialdehyde (AAS), α-aminoadipic acid (AAA), and Schiff bases. In the present paper, quantitative data of AAA are reported for the first time on a food matrix. The addition of the avocado extract inhibited the formation of AAS, AAA, and Schiff bases in patties during cooking and subsequent chilled storage. The antioxidant effect may respond to the protecting effect of phenolic compounds, mainly procyanidins, found on the avocado extract. Apparently, the combination of both strategies (back-fat replacement and addition of avocado extract) does not lead to an enhanced advantage on the oxidative stability of the product. The novel methodologies used in the present study enable a better comprehension of the mechanisms and consequences of protein oxidation in food systems.
authors.affiliation: Food Technology, Animal Production and Food Science, University of Extremadura, Cáceres, Spain.
authors.forename: Mariana
authors.initials: M
authors.lastname: Utrera
authors.forename: Javier-Germán
authors.initials: JG
authors.lastname: Rodríguez-Carpena
authors.forename: David
authors.initials: D
authors.lastname: Morcuende
authors.forename: Mario
authors.initials: M
authors.lastname: Estévez
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry*; D005503:Food Additives / Q000737:chemistry*; D005511:Food Handling; D008239:Lysine / Q000737:chemistry*; D008461:Meat Products / Q000032:analysis*; D010084:Oxidation-Reduction; D027421:Persea / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D013552:Swine; D014364:Tryptophan / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005503:Food Additives; D010936:Plant Extracts; D014364:Tryptophan; D008239:Lysine