食品科学

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免疫磁珠捕获PCR快速检测单核细胞增生李斯特氏菌

李婧姮1,郭慧琴2,高晓强3,刘 芳3,邱 实1,李建武1,曾海娟1,刘 兰2,宋春美1,刘 箐1,*   

  1. 1.上海理工大学医疗器械与食品学院,上海 200093;2.上海慧耘生物科技有限公司,上海 200433;
    3.甘肃出入境检验检疫局,甘肃 兰州 730020
  • 出版日期:2015-06-25 发布日期:2015-06-12
  • 通讯作者: 刘 箐
  • 基金资助:

    上海理工大学大学生卓越工程项目;上海市科委重点支撑项目(13430502400)

Immunomagnetic Capture PCR for Rapid Detection of Listeria monocytogenes

LI Jingheng1, GUO Huiqin2, GAO Xiaoqiang3, LIU Fang3, QIU Shi1, LI Jianwu1, ZENG Haijuan1, LIU Lan2, SONG Chunmei1, LIU Qing1,*   

  1. 1. College of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology,
    Shanghai 200093, China; 2. Prajna Biology Technique Co. Ltd., Shanghai 200433, China;
    3. Gansu Entry-Exit Inspection and Quarantine Bureau, Lanzhou 730020, China
  • Online:2015-06-25 Published:2015-06-12
  • Contact: LIU Qing

摘要:

利用免疫磁珠富集单核细胞增生李斯特氏菌,采用聚合酶链式反应(polymerase chain reaction,PCR)扩增进行快速检测。所制备的免疫磁珠选取在37 ℃条件下均匀振荡1 h为最佳包被条件,1 mg磁珠偶联抗体的最佳量为100 μg/mg,制备的免疫磁珠捕获率为45%。所建立的免疫磁珠捕获-PCR技术在样品细菌浓度达到104 CFU/mL即可被检出,其灵敏度是直接PCR检测限(105 CFU/mL)的10 倍,可为病原菌的富集和快速检测提供新方法。

关键词: 免疫磁珠, 单核细胞增生李斯特氏菌, 聚合酶链式反应

Abstract:

This experiment was conducted using immunomagnetic enrichment followed by amplification with polymerase
chain reaction (PCR) for rapid detection of Listeria monocytogenes. The best coating conditions were achieved by shaking
the prepared immunomagnetic beads at 37 ℃ for 1 h, and the amount of antibody conjugated to the immunomagnetic beads
was 100 μg/mg, leading to a capture rate of 45%. The immunomagnetic capture PCR assay was able to detect as low as
104 CFU/mL Listeria monocytogenes with 10 times higher sensitivity than direct PCR showing a limit of detection of
105 CFU/mL. This PCR assay can provide a new method for the enrichment and rapid detection of pathogenic bacteria.

Key words: IMBs, Listeria monocytogenes, PCR

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