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Abstract

Colorimetric assays , using colored substances in solution to determine the concentration without the aid of advanced instrumentation, are a convenient, cost-effective, and rapid method for ions, small molecules , oligonucleotides, miRNA , and protein detections. Nucleic acid amplification strategies play an important role in highly sensitive detection. Based on nucleic acid amplification , colorimetric assays detections would be more sensitive, proved by many detections, such as DNA, miRNA, and tumor cells . In this chapter, we introduce the nucleic acid amplification strategy-based colorimetric assays, including various amplification methods and colored substances. Au nanoparticles and Ag nanoparticles are usually employed as the colored substances by aggregation . HRP-catalyzed conversion of ABTS and TMB is also used as colored substances, which can be oxidized by hydrogen peroxide with color change , widely applied in electrochemical analysis and detection. The nucleic acid amplification strategies contain enzyme-assisted (PCR , RCA , NEANA, EASA, LAMP, DSN, NASBA, ESPAR, HDA) and enzyme-free (HCR, SDA ). Additionally, the future perspectives and advantages of adoption nucleic acid amplification techniques in colorimetric assays are also discussed.

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Shi, P., Zheng, X. (2019). Nucleic Acid Amplification Strategy-Based Colorimetric Assays. In: Zhang, S., Bi, S., Song, X. (eds) Nucleic Acid Amplification Strategies for Biosensing, Bioimaging and Biomedicine. Springer, Singapore. https://doi.org/10.1007/978-981-13-7044-1_5

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