Water-soluble precursors of beef flavour. Part II: Effect of post-mortem conditioning

Georgios Koutsidis, Stephen Elmore, Maria Jose Oruna-Concha, Mari Mar Campo, Jeff D. Wood, Donald Mottram

Research output: Contribution to journalArticlepeer-review

159 Citations (Scopus)


Changes in glycolytic metabolites, nucleotide degradation products, free amino acids and other amino compounds were monitored in beef muscle (M. longissimus lumborum), stored for 21 days at 4 °C, in order to evaluate how post-mortem conditioning may affect flavour formation in beef. The major effects observed in sugar-related substances were the dephosphorylation of the phosphates of glucose, fructose and mannose, to yield their free sugars, as well as the breakdown of inosine 5?-monophosphate, to give a sixfold increase in ribose. Total reducing sugars increased by only 15% during conditioning, while glycogen levels remained unchanged from 2 days post-slaughter. Free amino acids increased during conditioning, particularly between days 7 and 14. Phenylalanine, methionine, lysine, leucine and isoleucine were the amino acids showing the greatest increase with conditioning time, with methionine, in particular, showing a sevenfold increase during the conditioning period. The effects of these precursor changes on cooked beef flavour are discussed.
Original languageEnglish
Pages (from-to)270-277
JournalMeat Science
Issue number2
Publication statusPublished - Jun 2008


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