食品科学 ›› 2011, Vol. 32 ›› Issue (20): 185-190.doi: 10.7506/spkx1002-6630-201120039

• 分析检测 • 上一篇    下一篇

食品中荧光假单胞菌PCR检测体系的建立和评价

杨一林1,周 敏1,*,施春雷1,杨捷琳2,史贤明1   

  1. 1. 上海交通大学农业与生物学院
    2.上海市出入境检验检疫局
  • 出版日期:2011-10-25 发布日期:2011-10-12
  • 基金资助:
    上海市科学技术委员会技术标准专项(08DZ0504200);国家质量监督检验检疫总局标准课题(2009IK155)

Development and Evaluation of a PCR Assay for Detection of Pseudomonas fluorescens in Foods

YANG Yi-lin1,ZHOU Min1,*,SHI Chun-lei1,YANG Jie-lin2,SHI Xian-ming1   

  1. (1. School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200135, China)
  • Online:2011-10-25 Published:2011-10-12

摘要: 建立用聚合酶链式反应(polymerase chain reaction,PCR)检测食品中荧光假单胞菌的方法。分别针对16~23S rRNA基因间隔区序列、gyrB基因以及通过生物信息学方法发掘到的4个种特异性基因设计6对检测引物,通过初步特异性实验,筛选出一对种特异性最佳的引物。最终建立以gyrB基因为检测靶点的PCR扩增体系,并对体系进行系统评价。结果表明:该方法可特异检测荧光假单胞菌的存在,纯DNA检测灵敏度为14.9fg/μL (2~3拷贝/μL),纯培养物检测灵敏度为2.8×102CFU/mL。豆奶样品经15h充分增菌可提高检测灵敏度至0.28CFU/25g。

关键词: 荧光假单胞菌, gyrB基因, 聚合酶链式反应( PCR), 检测, 食品

Abstract: A polymerase chain reaction (PCR) assay for the detection of Pseudomonas fluorescens in foods was developed in this study. Six pairs of detection primers were designed for the 16-23S rDNA internal transcribed spacer sequence, the gyrB gene and 4 specific genes obtained by bioinformatics, respectively. Primary specificity experiments were used to screen the best primer pair out of them. A PCR amplification system targeting the gyrB gene was constructed and evaluated. The results indicated that the developed assay could specifically detect Pseudomonas fluorescens. The specificity was 14.9 fg/μL for pure DNA, 2.8 × 102 CFU/mL for pure culture and 0.28 CFU/ 25 g for soybean milk with 15 h enrichment.

Key words: Pseudomonas fluorescens, gyrB gene, polymerase chain reaction (PCR) , detection, food

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