Design strategies of AuNPs-based nucleic acid colorimetric biosensors

• Published in: TrAC, Trends in analytical chemistry (Regular ed.) Trends in analytical chemistry (Regular ed.), 2020-03, Vol.124, p.115795, Article 115795
• Main Authors: Yang, Tao, Luo, Zewei, Tian, Yonghui, Qian, Cheng, Duan, Yixiang
• Format: Article
• Language: English
• Subjects: Colorimetric assay; Design strategy; Enzyme-assisted signal amplification; Gold nanoparticles; Strand displacement amplification
• ISSN: 0165-9936; 1879-3142
• DOI: 10.1016/j.trac.2019.115795

Nucleic acids are important biomarkers related to diseases of cancer, infectious, and genetic disorders. As a kind of indicator, gold nanoparticles (AuNPs) can generate colored signals from red to blue, which enables convenient signal readout. Based on the inherent optical properties, AuNPs are frequently used to fabricate colorimetric biosensors. Crosslinking colorimetry of polyvalent DNA-functionalized AuNPs and salt-induced colorimetry of unmodified AuNPs are two basic AuNPs-based colorimetric schemes. In order to improve such sensors sensitivity or add some specific functions, some amplification reactions or functionalized nanomaterials need to be introduced. Therefore, in this review, colorimetric biosensors with different functions and features are discussed, together with their advantages and limitations. By digging into the profound relationship between the various methods and strategies in this field, this review aims to provide a comprehensive reference outlining the general design strategies for constructing AuNPs-based nucleic acid colorimetric biosensors. •The paper reviewed the design strategies for AuNPs-based colorimetric assay (ABCA).•The basic design guidelines were discussed for the two ABCA schemes.•Different technology assisted strategies used in ABCA were discussed.•The research trends and future perspectives of ABCA were presented.