Contamination rate and biofilm formation by psychotrophic bacteria from bulkmilk tanks and dairy processing equipment

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REZAPOUR R.; HANIFIAN S.

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Journal: JOURNAL OF FOOD MICROBIOLOGY Year:2018 | Volume:5 | Issue:2 Page(s): 79-89

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Title

Contamination rate and biofilm formation by psychotrophic bacteria from bulkmilk tanks and dairy processing equipment

Author(s)

REZAPOUR R. | HANIFIAN S. | Issue Writer Certificate

Keywords

Psychrotrophic bacteriaQ1

BiofilmQ1

Raw milk tanksQ1

Dairy processing equipmentQ1

Abstract

Psychorotrophs are the heterogeneous group of bacteria that can grow at refrigeratortemperatures. Most of these bacteria produce extracellular proteases and lipases whichdecompose lipids and proteins in milk that leads to undesirable defect in milk. These defectsdo not disappear even after pasteurization and sterilization. This study aimed to investigatethe occurrence rate and diversity of psychotropic bacteria in raw milk tankers and dairyprocessing equipment as well as the Biofilm-forming ability of the isolates. A total of 80samples including 30 samples of Raw milk tanks, 30 samples of dairy product processingequipment and 20 samples from different surfaces of the production line were collected. According to the results, 26. 25% of the samples were found contaminated withPsychrotrophic bacteria. Amongst, 65% of the surface samples of production line, 23. 33% ofthe Raw milk tanks and 3. 3% of the processing equipment were positive for psychrotrophicbacteria. Out of 31 isolates, Bacillus genus had the highest contamination rate (32. 25%), whilst Alcaligenes showed the lowest rate (3. 2%). The results of Biofilm formation revealedthat 21 isolates (67. 75%) were able to produce Biofilm. It was concluded that in some cases, current CIP procedure is not efficient for the entire removal of Biofilm from the processingequipment. It seems that it is necessary to apply complementary physical/chemicalapproaches along with the current CIP procedure to complete obliteration of Biofilms fromdairy industry.

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APA: Copy

REZAPOUR, R., & HANIFIAN, S.. (2018). Contamination rate and biofilm formation by psychotrophic bacteria from bulkmilk tanks and dairy processing equipment. JOURNAL OF FOOD MICROBIOLOGY, 5(2 ), 79-89. SID. https://sid.ir/paper/250645/en

Vancouver: Copy

REZAPOUR R., HANIFIAN S.. Contamination rate and biofilm formation by psychotrophic bacteria from bulkmilk tanks and dairy processing equipment. JOURNAL OF FOOD MICROBIOLOGY[Internet]. 2018;5(2 ):79-89. Available from: https://sid.ir/paper/250645/en

IEEE: Copy

R. REZAPOUR, and S. HANIFIAN, “Contamination rate and biofilm formation by psychotrophic bacteria from bulkmilk tanks and dairy processing equipment,” JOURNAL OF FOOD MICROBIOLOGY, vol. 5, no. 2 , pp. 79–89, 2018, [Online]. Available: https://sid.ir/paper/250645/en

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