A rapid sample preparation method for PCR detection of food pathogens based on buoyant density centrifugation

被引:42
作者
Lindqvist, R
Norling, B
Lambertz, ST
机构
[1] National Food Administration, Uppsala
[2] National Food Administration, S-751 26 Uppsala
关键词
D O I
10.1046/j.1472-765X.1997.00069.x
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The use of buoyant density centrifugation (BDC) to prepare samples for PCR analysis of food pathogens is described. Blue cheese and milk homogenates mere inoculated with Shigella flexneri and layered on top of Percoll(R) media. After BDC, the food homogenates remained in the upper part of the centrifuge tube, separated from the bacteria, which retained viability and were concentrated below the lighter Percoll(R) layer. PCR inhibitors staved in the homogenate and PCR analyses of treated samples consistently detected 10(4) cfu g(-1) of blue cheese and 500 cfu ml(-1) of milk, respectively. Differences in the density of live and killed Sh. flexneri and Yersinia enterocolitica were detected by BDC but were dependent on the mechanism of killing.
引用
收藏
页码:306 / 310
页数:5
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