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ISO 7889:2026

Yoghurt - Enumeration of characteristic microorganisms - Colony-count technique
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ISO 7889:2026

Yoghurt - Enumeration of characteristic microorganisms - Colony-count technique

ISO 7889:2026

This document specifies a method for the enumeration of the characteristic microorganisms Lactobacillus delbrueckii subsp. bulgaricus (in short: L. bulgaricus) and Streptococcus thermophilus (in short: S. thermophilus) by means of the colony-count technique.

The method is applicable to yoghurts (for the definition see CXS 243 2003[7]).

The colony-count technique (pour plates) is suitable for, but not limited to, the enumeration of L. bulgaricus and S. thermophilus in test samples with a minimum of 10 colonies counted on a plate. This corresponds to a level of the characteristic microorganisms L. bulgaricus and S. thermophilus that is expected to be higher than 100 cfu/g.

The colony-count technique (spread plates) is suitable for, but not limited to, the enumeration of L. bulgaricus and S. thermophilus in test samples with a minimum of 10 colonies counted on a plate. This corresponds to a level of the characteristic microorganisms L. bulgaricus and S. thermophilus that is expected to be higher than 1 000 cfu/g.

SDO ISO: International Organization for Standardization
Document Number ISO 7889
Publication Date Not Available
Language en - English
Page Count 24
Revision Level
Supercedes
Committee ISO/TC 34/SC 5
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