title: Effect of lipid composition on meat-like model systems containing cysteine, ribose, and polyunsaturated fatty acids.
abstract: This paper compares the volatile constituents of model systems containing the important meat aroma precursors cysteine and ribose, with and without either methyl linoleate, an n-6 fatty acid, or methyl alpha-linolenate, an n-3 acid, both of which are present in meat. Many of the volatile compounds formed from the reaction between cysteine and ribose were not formed, or formed in lower amounts, when lipid was present. This may be due to the reaction between hydrogen sulfide, formed from the breakdown of cysteine, and lipid degradation products. In addition, cysteine and ribose modified lipid oxidation pathways, so that alcohols and alkylfurans were formed rather than saturated and unsaturated aldehydes. Several volatile compounds, which have been found at elevated levels in cooked meat from animals fed supplements high in n-3 acids, were formed when methyl alpha-linolenate reacted with cysteine and ribose. The possible effects of increasing the n-3 content of meat upon flavor formation during cooking are discussed.
authors.affiliation: School of Food Biosciences, The University of Reading, Whiteknights, Reading RG6 6AP, United Kingdom. J.S.Elmore@reading.ac.uk
authors.forename: J Stephen
authors.initials: JS
authors.lastname: Elmore
authors.forename: Maria M
authors.initials: MM
authors.lastname: Campo
authors.forename: Michael
authors.initials: M
authors.lastname: Enser
authors.forename: Donald S
authors.initials: DS
authors.lastname: Mottram
mesh_terms: D003545:Cysteine / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008055:Lipids / Q000032:analysis*; D008460:Meat / Q000032:analysis*; D009812:Odorants / Q000032:analysis; D012266:Ribose / Q000032:analysis*; D012680:Sensitivity and Specificity; D012903:Smell; D013438:Sulfhydryl Compounds / Q000032:analysis; D013649:Taste
chemical_list: D005231:Fatty Acids, Unsaturated; D008055:Lipids; D013438:Sulfhydryl Compounds; D012266:Ribose; D003545:Cysteine