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Influence of ions on growth and production of exopolysaccharides by Lactobacillus delbrueckii subsp. bulgaricus NCFB 2772

Published online by Cambridge University Press:  01 February 2000

GERT J. GROBBEN
Affiliation:
Division of Industrial Microbiology, Department of Food Technology and Nutrition Sciences, Wageningen University, PO Box 8129, NL-6700 EV Wageningen, The Netherlands Present address: Agrotechnological Research Institute (ATO), PO Box 17, NL-6700 AA Wageningen, The Netherlands.
INGEBORG C. BOELS
Affiliation:
Division of Industrial Microbiology, Department of Food Technology and Nutrition Sciences, Wageningen University, PO Box 8129, NL-6700 EV Wageningen, The Netherlands
JAN SIKKEMA
Affiliation:
Friesland Coberco Dairy Foods, PO Box 226, NL-8901 MA Leeuwarden, The Netherlands
MARK R. SMITH
Affiliation:
Netherlands Institute for Dairy Research (NIZO), PO Box 20, NL-6710 BA Ede, The Netherlands Present address: Rhodia Food, South Bank Technopark, London SE1 6LN, UK.
JAN A. M. DE BONT
Affiliation:
Division of Industrial Microbiology, Department of Food Technology and Nutrition Sciences, Wageningen University, PO Box 8129, NL-6700 EV Wageningen, The Netherlands

Abstract

Several lactic acid bacteria produce exopolysaccharides (EPS), either attached to the cell wall or excreted into the environment as slime material. EPS produced by Lactobacillus delbrueckii subsp. bulgaricus (Lb. bulgaricus) and Streptococcus thermophilus play an important role in improving the texture and stability of yogurt and preventing syneresis (Cerning, 1990; Nakajima et al. 1990). The amount and composition of the EPS produced by lactic acid bacteria are dependent on a number of factors, such as temperature, initial pH, carbon source and the availability of minerals, vitamins and other medium components.

In previous work it was shown that the production and sugar composition of the EPS from Lb. bulgaricus NCFB2772 are affected by the carbohydrate source (Grobben et al. 1995, 1996). In a simplified defined medium, from which several vitamins and trace elements were omitted, EPS production by Lb. bulgaricus significantly increased, although growth of the strain was reduced (Grobben et al. 1998).

Type
SHORT COMMUNICATION
Copyright
Proprietors of Journal of Dairy Research 2000

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