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Comparison of Three M17 Media for the Enumeration of Streptococcus thermophilus in Fermented Dairy Products
R Jordano1, Cristina E Serrano1, María Torres1
1Departamento de Bromatología y Tecnología de los Alimentos, Universidad de Córdoba, Facultad de Veterinaria, E-14071 Córdoba, Spain.
Abstract:
Three M17 agar media for the enumeration of Streptococcus thermophilus in fermented dairy products, such as yogurt and other commercial fermented milk, were compared: CM785 Oxoid®, 15108 Merck®, and a M17 made in the laboratory. In all cases, the highest counts were taken on Oxoid® medium. The difference between the averages of the counts on the Oxoid® M17 and the laboratory-made M17 is significant, (P ≤ 0.05). However, the difference between the counts on the Oxoid® and Merck® media is not significant.
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