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KMID : 0380620100420040494
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Korean Journal of Food Science and Technology
2010 Volume.42 No. 4 p.494 ~ p.501
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Monitoring Bacillus cereus and Aerobic Bacteria in Raw Infant Formula and Microbial Quality Control during Manufacturing
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Jung Woo-Young
Eom Joon-Ho
Kim Byeong-Jo
Ju In-Sun
Kim Chang-Soo
Kim Mi-Ra
Byun Jung-A
Park You-Gyoung
Son Sang-Hyuck
Lee Eun-Mi
Jeong Rae-Seok
Na Mi-Ae
Yuk Dong-Yeon
Gang Ji-Yeon
Heo Ok-Sun
Yun Min-Ho
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Abstract
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The purpose of this study was to examine the presence of Bacillus cereus, aerobic bacteria and coliforms in the raw material of infant formulas and investigate the manufacturing process in terms of microbial safety. Among ten kinds of raw infant formula material samples (n=20), Bacillus cereus appeared in two (n=4). Aerobic bacteria were not detected in raw infant formula material or maximum 4.15 log CFU/g. Eleven species of aerobic bacteria were isolated and 76% of them were Sphingomonas paucimobilis, Pseudomonas fluorescens, Rhizobium radiobactor, or Stenotrophomonas maltophilia. A Pearson’s correlation analysis revealed that the most influential factors for detecting Bacillus cereus were aerobic bacteria and coliforms.
In other words, when the measured values of aerobic bacteria and coliforms were higher,
the possibility that Bacillus cereus would appear increased. In a regression model to predict Bacillus cereus, the rate of appearance was correlated with aerobic bacteria and coliforms, and its contribution rate for effectiveness was 86%.
Improving microbial quality control by pasteurization, spray dry, popping and extrusion resulted in a decrease in the numbers of Bacillus cereus, aerobic bacteria and coliforms in the raw materials. The results suggest that a hazard analysis and critical control point system might be effective for reducing microbiological contamination.
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KEYWORD
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Bacillus cereus, aerobic bacteria, infant formulas, coliforms, microbial quality control
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