Li Darong, Zhao Jiayi, Lan Weiqing, Zhao Yong, Sun Xiaohong
College of Food Science and Technology, Shanghai Ocean University, Shanghai, 201306, People's Republic of China.
Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai, 201306, People's Republic of China.
World J Microbiol Biotechnol. 2023 May 9;39(7):188. doi: 10.1007/s11274-023-03640-1.
Vibrio parahaemolyticus has become an important public threat to human health. Rapid and robust pathogen diagnostics are necessary for monitoring its outbreak and spreading. Herein, we report an assay for the detection of V. parahaemolyticus based on recombinase aided amplification (RAA) combined with lateral flow dipstick (LFD), namely RAA-LFD. The RAA-LFD took 20 min at 36~38 ℃, and showed excellent specificity. It detected as low as 6.4 fg/µL of V. parahaemolyticus in genomic DNA, or 7.4 CFU/g spiked food samples with 4 h of enrichment. The limit of detection in shrimp (Litopenaeus Vannamei), fish (Carassius auratus), clam (Ruditapes philippinarum) evidenced that sensitivity was considerably affected by the food matrix. The presence of food matrix reduced the sensitivity of spiked food samples by 10 ~ 100 times. In the filed samples detection, RAA-LFD method showed good coincidence with GB4789.7-2013 method and PCR method at rates of 90.6% and 94.1%, respectively. RAA-LFD has high accuracy and sensitivity for the detection of V. parahaemolyticus, which can serve as a model tool to meet the growing need for point-of-care diagnosis of V. parahaemolyticus.
副溶血性弧菌已成为对人类健康的重要公共威胁。快速且可靠的病原体诊断对于监测其爆发和传播至关重要。在此,我们报告一种基于重组酶辅助扩增(RAA)结合侧向流动试纸条(LFD)检测副溶血性弧菌的方法,即RAA-LFD。RAA-LFD在36~38℃下只需20分钟,且具有出色的特异性。它能检测低至6.4 fg/µL基因组DNA中的副溶血性弧菌,或在经过4小时富集的加标食品样本中检测到低至7.4 CFU/g的副溶血性弧菌。在虾(凡纳滨对虾)、鱼(鲫鱼)、蛤(菲律宾蛤仔)中的检测限表明,食品基质对灵敏度有显著影响。食品基质的存在使加标食品样本的灵敏度降低了10至100倍。在现场样本检测中,RAA-LFD方法与GB4789.7-2013方法和PCR方法的符合率分别为90.6%和94.1%,显示出良好的一致性。RAA-LFD对副溶血性弧菌的检测具有高准确性和灵敏度,可作为满足对副溶血性弧菌即时诊断日益增长需求的模型工具。
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