Abstract
Lateral flow assays, as a low-cost, simple, portable and disposable product of vitro diagnostic, are being widely used for point-of-care testing. However, the poor sensitivity of LFAs is the main challenge for commercialization. In order to enhance the sensitivity of LFAs, cellulose nanofibers (CNFs) have been integrated into LFAs to enhance the sensitivity of protein LFAs. A simple method is also presented to modify the properties of paper substrate by incorporating CNFs into a nitrocellulose membrane to enhance the sensitivity of nucleic acid LFAs. This method changes the pore size, porosity, surface groups and surface area of paper substrate and then increases the adsorption ability of biomolecules on paper substrate. The results indicate that the sensitivity of nucleic acid LFAs in Staphylococcus aureus testing achieves a 20-fold enhancement. Hence, we anticipate that this simple method has the potential for other paper-based devices to improve the performance.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21808132), the Natural Science Basic Research Plan of Shaanxi Province (2019JQ-517), the Project of Shaanxi Provincial Education department (18JK0096), the China Postdoctoral Science Foundation (2018 M633525), the Opening Project of National Experimental Teaching Demonstration Center of Light Chemical Engineering (2018QGSJ02-10).
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Tang, R.H., Liu, L.N., Zhang, S.F. et al. Modification of a nitrocellulose membrane with cellulose nanofibers for enhanced sensitivity of lateral flow assays: application to the determination of Staphylococcus aureus. Microchim Acta 186, 831 (2019). https://doi.org/10.1007/s00604-019-3970-z
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DOI: https://doi.org/10.1007/s00604-019-3970-z