Journal
ANALYTICA CHIMICA ACTA
Volume 1221, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.aca.2022.340111
Keywords
Aptasensor; Arsenic; Heavy metal; Colorimetry; Positively-charged AuNPs
Categories
Funding
- Shanghai Science and Technology Innovation Action Project [20392001000, 20dz1204804]
- National Key Research and Development Program of China [2016YFD0800807]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- Shanghai Education Development Foundation and Shanghai Municipal Education Commission [KF2020012]
- Project of Key Laboratory of Urban Agriculture in 2020 [17CG07]
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In this study, the aggregation and redispersion behavior of positively-charged AuNPs modified with cysteamine were regulated by the negatively charged As(III)-specific aptamer. By optimizing the concentration of As(III)-apt, a dual-mode colorimetric aptasensor for As (III) determination was established, which could sensitively quantify As(III) and selectively differentiate it from other control ions.
The aggregation and redispersion of positively-charged AuNPs ((+)AuNPs) modified with cysteamine (CS) could be regulated by the negatively charged As(III)-specific aptamer (As(III)-apt). In general, (+)AuNPs aggregated with increasing inducer concentration. However, in the present study, it was found that (+)AuNPs re-dispersed after a certain high concentration of As(III)-apt was reached. By optimizing the concentration of As(III)-apt that resulted in the aggregation and redispersion behavior of (+)AuNPs, a dual-mode colorimetric aptasensor for As (III) determination was established. It was not only able to quantify As(III) sensitively over a ranges of As(III) concentrations, but also to selectively differentiate As(III) and eliminate false results from other control ions by dual-mode.
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