کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2091794 | 1081749 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Development of a rapid quantitative PCR assay for direct detection and quantification of culturable and non-culturable Escherichia coli from agriculture watersheds Development of a rapid quantitative PCR assay for direct detection and quantification of culturable and non-culturable Escherichia coli from agriculture watersheds](/preview/png/2091794.png)
A real-time quantitative polymerase chain reaction (Q-PCR) assay was developed for detecting and quantifying Escherichia coli in water samples from agricultural watersheds. The assay included optimization of DNA extraction and purification from water samples, and Q-PCR amplification conditions using newly designed species-specific oligonucleotide primers derived from conserved flanking regions of the 16S rRNA gene, the internal transcribed spacer region (ITS) and the 23S rRNA gene. The assay was optimized using a pure culture of E. coli with known quantities spiked into autoclaved agricultural water samples. The optimized assay was capable of a minimum quantification limit of 10 cells/ml of E. coli in the spiked agricultural water samples. A total of 121 surface water samples from three agricultural watersheds across Canada were analyzed, and results were compared with conventional culture-based enumerations of E. coli. The Q-PCR assay revealed significantly higher numbers of E. coli in water samples than the culture-based assay in each agricultural watershed. The new Q-PCR assay can facilitate the quantification of E. coli in a single water sample in < 3 h, including melt curve analysis, across a range of agricultural water quality conditions.
Journal: Journal of Microbiological Methods - Volume 69, Issue 3, June 2007, Pages 480–488