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Modification of the volatile compound profile of cheese, by a Lactococcus lactis strain expressing a mutant oligopeptide binding protein

Published online by Cambridge University Press:  29 January 2008

Antonia Picon ,
Estrella Fernández-García ,
Pilar Gaya  and
Manuel Nuñez
Antonia Picon
Affiliation:
Departamento de Tecnología de Alimentos, SGIT-INIA, Carretera de La Coruña Km 7.5, 28040 MadridSpain
Estrella Fernández-García*
Affiliation:
Departamento de Tecnología de Alimentos, SGIT-INIA, Carretera de La Coruña Km 7.5, 28040 MadridSpain
Pilar Gaya
Affiliation:
Departamento de Tecnología de Alimentos, SGIT-INIA, Carretera de La Coruña Km 7.5, 28040 MadridSpain
Manuel Nuñez
Affiliation:
Departamento de Tecnología de Alimentos, SGIT-INIA, Carretera de La Coruña Km 7.5, 28040 MadridSpain
*
*For correspondence; e-mail: [email protected]
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Abstract

Lactococcus lactis strain AMP2I expresses OppA(D471R), a mutant oligopeptide binding OppA protein in which the aspartyl residue at position 471 was replaced by arginine. As a consequence of a different peptide transport in this strain, experimental Hispánico cheese made with Lc. lactis AMP2I had a higher content of total free amino acids than control cheese made with Lc. lactis AMP1I, an isogenic strain expressing wild-type OppA (Picon et al. 2005, 2007). In this work higher levels of diketones, hydroxy-ketones and, to a lesser extent, branched chain aldehydes were recorded for experimental cheese compared with control cheese. These differences levelled off as ripening proceeded. Strong correlations support the hypothesis that the increased levels of these volatile compounds in cheese made with Lc. lactis AMP2I are linked to higher concentrations of free amino acids threonine, valine and leucine.

Keywords

Oligopeptide binding protein (OppA)Hispánico cheeseVolatile compounds
Type
Research Article
Information
Journal of Dairy Research , Volume 75 , Issue 1 , February 2008 , pp. 30 - 36
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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