Abstract:
:In the dairy industry, bacterial contaminants persist on equipment surfaces due to spore and biofilm formation. These are involved in cross-contamination problems that affect the quality of processed products and limit their life. The pasteurization process, in which milk is submitted to moderate heat treatment, is inefficient against bacterial spores. The most prevalent sporulated bacteria belong to Bacillus and related genera. The situation is more complicated in countries where pasteurized milk is derived from imported milk powder originally contaminated by bacterial spores. Studies have shown biofilm formation on dairy equipment by mesophilic strains from the group Bacillus cereus and thermophilic strains from the genus Geobacillus. These biofilms are resistant to cleaning procedures and are sources of chronic contamination of pasteurized milk. This review analyzes the dairy situation in Algeria exposed to sporulated flora and derived biofilm problems, with the aim of proposing efficient solutions in the light of current knowledge. [Journal translation]. :En industrie laitière, la persistance des contaminants bactériens à la surface des équipements est due à la formation de spores et de biofilms. Ces derniers sont impliqués dans les problèmes de contamination croisée qui affectent la qualité des produits transformés et limitent leur durée de conservation. C’est le cas du lait pasteurisé, qui de plus a subi un traitement thermique modéré, la pasteurisation étant sans effet sur les spores bactériennes. Les bactéries sporulées les plus rencontrées appartiennent à Bacillus et aux genres apparentés. Cette situation est compliquée dans les pays où le lait pasteurisé est obtenu à partir de la poudre de lait d’importation initialement contaminée par les spores bactériennes. Des études ont montré la formation de biofilm sur les équipements de ces laiteries par des souches mésophiles du groupe Bacillus cereus et des souches thermophiles du genre Geobacillus. Ces biofilms résistent aux opérations de nettoyage et sont une source de contamination chronique du lait pasteurisé. Cette synthèse est une analyse de la situation des laiteries en Algérie, qui sont confrontées au problème de la flore sporulée et de son biofilm, avec pour objectif la proposition de solutions efficaces à la lumière des connaissances actuelles.
journal_name
Can J Microbioljournal_title
Canadian journal of microbiologyauthors
Malek Fdoi
10.1139/cjm-2018-0435subject
Has Abstractpub_date
2019-06-01 00:00:00pages
405-420issue
6eissn
0008-4166issn
1480-3275journal_volume
65pub_type
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journal_title:Canadian journal of microbiology
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