A differential medium for the enumeration of homofermentative and heterofermentative lactic Acid bacteria. 1987

L C McDonald, and R F McFeeters, and M A Daeschel, and H P Fleming
Food Fermentation Laboratory, Agricultural Research Service, U.S. Department of Agriculture, and Department of Food Science, North Carolina Agricultural Research Service, North Carolina State University, Raleigh, North Carolina 27695-7624.

A medium was developed for the differential enumeration of homofermentative and heterofermentative lactic acid bacteria. Essential components of the medium included fructose (14 mM), KH(2)PO(4) (18 mM), bromcresol green (as a pH indicator), and other nutrients to support growth. In agar medium, homofermentative colonies were blue to green, while heterofermentative colonies remained white. A total of 21 Lactobacillus, Pediococcus, Leuconostoc, and Streptococcus species were correctly classified with the medium.

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