Abstract
Real-time fluorescence detection of nucleic acid exhibit excellent performance in analytical and diagnostic applications. However, the requirement of laboratory-based instrument and complex nucleic acid extraction greatly limits their application in point-of-care testing (POCT). Herein, a novel integrated silica membrane–based platform incorporating nucleic acid purification, amplification, and detection steps was developed. A universal and portable visualization platform was fabricated by incorporating denaturation bubble-mediated strand exchange amplification (SEA) reaction with silica membrane. The fluorescence signal of SYBR Green I with amplification products was visualized by the naked eye using a simple ultraviolet light on the silica membrane, and significant discrimination between the positive and negative samples could be easily and visually obtained. Besides, chitooligosaccharide-modified silica membrane allows the purification of nucleic acid in a totally aqueous system and enables in situ SEA. With the proposed integrated platform, 102–108 cfu/mL Vibrio parahaemolyticus could be successfully detected and excellent performance was also revealed for gram-positive pathogens. The detection limit of the method for artificially spiked oysters was 103 cfu/g and reached 100 cfu/g after 12 h enrichment. This proof-of-concept method could also be applied to a variety of nucleic acid amplification methods. We believe that the proposed silica membrane–based platform has great potential for the rapid and low-cost detection of nucleic acids especially in low-resource settings.
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Acknowledgments
This study was financially supported by grants from the National Natural Science Foundation of China (31670868, 21675094, 31800414), Open Fund of Key Laboratory of Experimental Marine Biology, Chinese Academy of Sciences (No. KF2018NO1), Shandong Province Natural Science Foundation (ZR2019BC040), and National Key Research and Development Programs of China (2018YFE0113300).
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Wang, X., Yan, C., Wang, X. et al. Integrated silica membrane–based nucleic acid purification, amplification, and visualization platform for low-cost, rapid detection of foodborne pathogens. Anal Bioanal Chem 412, 6927–6938 (2020). https://doi.org/10.1007/s00216-020-02823-1
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DOI: https://doi.org/10.1007/s00216-020-02823-1