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KMID : 1007520160250041109
Food Science and Biotechnology
2016 Volume.25 No. 4 p.1109 ~ p.1113
Classification and fatty acid composition analysis of Cronobacter spp. isolated from powdered infant formula in China
Yang Xiaojuan

Wu Qingping
Zhang Jumei
Guo Weipeng
Mo Shuping
Liu Shengrong
Abstract
This study aimed to classify a collection of Enterobacter sakazakii (E. sakazakii) strains previously identified from powdered infant formula (PIF) to species level by recN gene sequencing and biochemical testing to determine the distribution of Cronobacter species in China and investigate the strain diversity by cellular fatty acid (CFA) analysis. Of 24 E. sakazakii isolates, 23 were identified as C. sakazakii and one was C. malonaticus. The 23 C. sakazakii isolates showed the same CFA profiles. The C. malonaticus isolate was discriminated from the C. sakazakii isolates by the significant difference in the amounts of C12:0, C14:0, and C17:0 cyclo acids. These results showed that C. sakazakii and C. malonaticus were the common Cronobacter species distributed in PIF in China and that the isolates of the two species exhibited different CFA profiles. These findings are of value for epidemiological investigations and provide an alternative method for confirming various Cronobacter spp.
KEYWORD
Cronobacter, powdered infant formula, classification, cellular fatty acids
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