Abstract
A colorimetric assay for human papillomavirus (HPV) DNA was developed based on the retardation of the avidin-induced aggregation of gold nanoparticles (AuNPs) by HPV DNA. Positively charged avidin acts as a coagulant for AuNP aggregation. In the presence of the target DNA, however, the aggregation of AuNPs is retarded owing to electrosteric stabilization as a result of the hybridization of the target and probe DNA. In the absence of HPV DNA, the stabilization effect caused by the biotinylated probe DNA is weak, resulting in NP aggregation and a color change from red to purple. Aggregation may be easily observed with bare eyes or spectrophotometrically at about 560 nm. The visual detection limit is 1 nM. The assay was used for the determination of HPV DNA after polymerase chain reaction (PCR) amplification without any further purification.
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This work was supported by the Natural Science Foundation of China (NSFC No. 21065013 and 21165019).
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Piao, J., Zhou, X. & Wu, X. Colorimetric human papillomavirus DNA assay based on the retardation of avidin-induced aggregation of gold nanoparticles. Microchim Acta 185, 537 (2018). https://doi.org/10.1007/s00604-018-3065-2
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DOI: https://doi.org/10.1007/s00604-018-3065-2