International Standard
ISO 7889:2026
Yoghurt — Enumeration of characteristic microorganisms — Colony-count technique
Reference number
ISO 7889:2026
Edition 2
2026-01
© ISO 2026
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Published (Edition 2, 2026)

ISO 7889:2026

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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2026-01
    Stage
    : International Standard published [60.60]
  • Edition
     : 2
    Number of pages
     : 16
  • Technical Committee :
    ISO/TC 34/SC 5
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Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal

3
Good Health and Well-being

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