Bulletin of the IDF N°538/2025: Interlaboratory study on the enumeration of characteristic microorganisms in yoghurt

Publication description

This bulletin of the IDF (International Dairy Federation) presents the report of the precision data obtained from the interlaboratory study (ILS) organized for the revision of ISO 7889 | IDF 117 ‘Yoghurt — Enumeration of characteristic microorganisms — Colony-count technique’.

The ILS was conducted using samples of yoghurt with different levels of Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus.

Fourteen laboratories participated from Africa, China, Europe, and the United States, according to the draft international standard (DIS) version of ISO 7889 | IDF 117.

The data of ILS have been analysed and accepted. Therefore, the resulting precision data have been incorporated into ISO 7889 | IDF 117.

Keywords:

yoghurt, characteristic microorganisms, Streptococcus thermophilus, Lactobacillus delbrueckii
subsp. bulgaricus (L. bulgaricus), analytical method, enumeration, spread plate, pour plate, spiral plate, interlaboratory study, repeatability standard deviation, reproducibility standard deviation.

Cite this content as:

International Dairy Federation. (2025). Interlaboratory study on the enumeration of characteristic microorganisms in yoghurt (Bulletin of the IDF N° 538/2025).
https://doi.org/10.56169/PNUY7550