ISO 7889 | IDF 117: 2026 - Yoghurt — Enumeration of characteristic microorganisms — Colony-count technique
Yaourt — Dénombrement des micro-organismes caractéristiques — Technique de comptage des colonies
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Document info
| pages | 24 |
|---|---|
| published date | 15 January 2026 |
| reference | ISO 7889 | IDF 117: 2026 |
Publication description
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.
This standard cancels and replaces the first edition ISO 7889 | IDF 117: 2003
