Analysis of volatile compounds produced by 2 strains of Lactococcus lactis isolated from Leben (Tunisian fermented milk) using solid-phase microextraction-gas chromatography

Ziadi, M.; Wathelet, Jean-Paul; Marlier, Myriam; Hamdi, M.; Thonart, Philippe

doi:10.1111/j.1750-3841.2008.00846.x

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Analysis of volatile compounds produced by 2 strains of Lactococcus lactis isolated from Leben (Tunisian fermented milk) using solid-phase microextraction-gas chromatography

Ziadi, M.; Wathelet, Jean-Paul; Marlier, Myriam et al.

2008 • In Journal of Food Science, 73 (6), p. 247-S252

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https://hdl.handle.net/2268/14791

DOI
10.1111/j.1750-3841.2008.00846.x

PubMed
19241567

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Keywords :

Lactococcus; Leben; quantification; solid-phase microextraction (SPME); volatiles

Abstract :

[en] The volatile compounds that characterize Leben during fermentation with 2 Lactococcus lactis strains (SLT6 and SLT10) in flasks, in a 100-L fermentor, and during storage at 4 degrees C, were investigated and compared to those from commercial Leben. Volatile compounds from Leben were concentrated by a Carboxen-PDMS fiber and analyzed by GC-MS. These compounds include acids, alcohols, aldehydes, ketones, sulfur compounds, and hydrocarbons. Commercial Leben presented a poor volatile profile compared to the laboratory-made Leben. The mixed culture of 2 Lactococcus lactis strains resulted in higher volatile compound formation than the single strain culture. The GC volatile profiles of Leben produced In flask and in the 100-L fermentor were similar. Changes in volatile compounds were observed during storage at 4 degrees C. The effect of culture conditions on production of volatiles by SLT6 strain was studied. Aeration (0.1 mL/min) and agitation enhanced the production of diacetyl, acetoin, 3-methylbutanal, and 3-methylbutanol. Fermentation at pH 5 had no effect on volatile production.

Disciplines :

Food science

Author, co-author :

Ziadi, M.

Wathelet, Jean-Paul ; Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech

Marlier, Myriam ; Centre Hospitalier Universitaire de Liège - CHU > Imagerie médicale

Hamdi, M.

Thonart, Philippe ; Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech - Biochimie et microbiologie industrielles

Language :

English

Title :

Analysis of volatile compounds produced by 2 strains of Lactococcus lactis isolated from Leben (Tunisian fermented milk) using solid-phase microextraction-gas chromatography

Publication date :

2008

Journal title :

Journal of Food Science

ISSN :

0022-1147

eISSN :

1750-3841

Publisher :

Blackwell Publishing

Volume :

Issue :

Pages :

S247-S252

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 17 June 2009

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