Frontiers in Microbiology (Jan 2022)

Establishment and Evaluation of a Loop-Mediated Isothermal Amplification Assay for Rapid Detection of Pseudomonas fluorescens in Raw Milk

  • Yushan Bu,
  • Wenjun Qiao,
  • Zhengyuan Zhai,
  • Tongjie Liu,
  • Pimin Gong,
  • Lanwei Zhang,
  • Yanling Hao,
  • Yanling Hao,
  • Huaxi Yi

DOI
https://doi.org/10.3389/fmicb.2021.810511
Journal volume & issue
Vol. 12

Abstract

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Raw milk is susceptible to microbial contamination during transportation and storage. Pseudomonas fluorescens producing heat-resistant enzymes have become the most common and harmful psychrophilic microorganisms in the cold chain logistics of raw milk. To rapidly detect P. fluorescens in raw milk, the protease gene aprX was selected as a detection target to construct a set of primers with strong specificity, and a loop-mediated isothermal amplification (LAMP) assay was established. The detection thresholds of the LAMP assay for pure cultured P. fluorescens and pasteurized milk were 2.57 × 102 and 3 × 102 CFU/mL, respectively. It had the advantages over conventional method of low detection threshold, strong specificity, rapid detection, and simple operation. This LAMP assay can be used for online monitoring and on-site detection of P. fluorescens in raw milk to guarantee the quality and safety of dairy products.

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