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Journal of Dairy Science Vol. 79 No. 5 775-781
© 1996 by American Dairy Science Association ®
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Improvement of Diacetyl Production by Lactococcus lactis ssp. lactis CNRZ 483 Through Oxygen Control

H. Boumerdassi 1, M. Desmazeaud 2, C. Monnet 1, C. Y. Boquien 1, and G. Corrieu 1

1 Institut National de la Recherche Agronomique, Laboratoire de Génie et Microbiologie des Procédés Alimentaires, 78850 Thiverval Grignon, France
2 Institut National de la Recherche Agronomique, Unité de Recherches Laitières, 78350 Jouy-en-Josas, France

This study illustrated the effect of controlled oxygenation on diacetyl production by citrate-utilizing Lactococcus lactis ssp. lactis CNRZ 483. Effects of soluble oxygen concentrations at 21 and 50% of the medium saturation and pressurization of the reactor under 1 and 2 atm (atmospheres) of oxygen were tested. Oxygen had a slightly negative effect on the growth of L. lactis ssp. lactis CNRZ 483. In contrast, oxygen had a substantial effect on diacetyl production. Under nitrogen, the maximal concentration of diacetyl in the medium was 0.015 mM; diacetyl maxima were 0.13 and 0.26 mM when soluble oxygen concentrations were 21 and 5096, respectively. Diacetyl production reached a maximum of 0.39 and 0.45 mM when oxygen pressures of the culture were 1 and 2 atm, respectively. The effect of oxygen on lactate dehydrogenase activity and on chemical decarboxylation of alpha-acetolactate explained the higher diacetyl production.

Key Words: Lactococcus lactis ssp. lactis • diacetyl • oxygen

Submitted on September 14, 1995
Accepted on December 29, 1995




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