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Updated: Aug 21, 2026

Evaluation of Microbial Safety of Dairies using Bacterial Proteomic Profiling via MALDI Approach
Published on: October 7, 2025
A RAPD-based survey of thermophilic bacilli in milk powders from different countries
Andreas Rückert1, Ron S Ronimus, Hugh W Morgan
1Thermophile Research Unit, Department of Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand. andreas.rueckert@alumni.TU-Berlin.de
Abstract:
Twenty-eight milk powders from 18 different countries were examined for the number and type of contaminating thermophilic bacilli. Of 742 isolates examined, 96.8% were assigned to the same strains of bacilli as previously found in New Zealand powders. The dominant isolate was Anoxybacillus flavithermus strain C followed by Bacillus licheniformis strain F. The former was also prevalent in New Zealand powders and the results demonstrate that A. flavithermus represents a widespread contaminant, seemingly ubiquitous in factories producing milk powder. The presence of thermophilic strains of Geobacillus stearothermophilus and to a lesser extent of Bacillus subtilis in milk powders was reconfirmed.
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