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Applied and Environmental Microbiology, September 2002, p. 4441-4447, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4441-4447.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Effect of Modified Atmosphere Composition on the Metabolism of Glucose by Brochothrix thermosphacta

Carmen Pin,* Gonzalo D. García de Fernando, and Juan A. Ordóñez

Departamento de Higiene y Tecnología de los Alimentos (Nutrición y Bromatología III), Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain

Received 4 December 2001/ Accepted 18 June 2002

The influence of atmosphere composition on the metabolism of Brochothrix thermosphacta was studied by analyzing the consumption of glucose and the production of ethanol, acetic and lactic acids, acetaldehyde, and diacetyl-acetoin under atmospheres containing different combinations of carbon dioxide and oxygen. When glucose was metabolized under oxygen-free atmospheres, lactic acid was one of the main end products, while under atmospheres rich in oxygen mainly acetoin-diacetyl was produced. The proportions of the total consumed glucose used for the production of acetoin (aerobic metabolism) and lactic acid (anaerobic metabolism) were used to decide whether aerobic or anaerobic metabolism predominated at a given atmosphere composition. The boundary conditions between dominantly anaerobic and aerobic metabolisms were determined by logistic regression. The metabolism of glucose by B. thermosphacta was influenced not only by the oxygen content of the atmosphere but also by the carbon dioxide content. At high CO2 percentages, glucose metabolism remained anaerobic under greater oxygen contents.

* Corresponding author. Mailing address: Departamento de Higiene y Tecnología de los Alimentos (Nutrición y Bromatología III), Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain. Phone: 34 91 3943749. Fax: 34 91 3943743. E-mail: carmenpi{at}vet.ucm.es.

Applied and Environmental Microbiology, September 2002, p. 4441-4447, Vol. 68, No. 9
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.9.4441-4447.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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