Liquid crystal based sensor for antimony ions detection using poly-adenine oligonucleotides

Zhan，Xiyun1,2; Yang，Kun Lin2; Luo，Dan1

2024-01-15

10.1016/j.talanta.2023.125148

Talanta   Impact Factor & Quartile

0039-9140

Antimony is highly toxic and a key water pollutant, which needs to be monitored closely. To date, however, most analytical methods for antimony detection are quite limited because they are complicated, expensive, and not suitable for real-time monitoring of antimony. In this study, a label-free and rapid method for antimony ions (Sb) detection is developed based on liquid crystals and a 10-mer poly-adenine oligonucleotide as a specific recognition probe for the first time. The working principle is based on the binding of the oligonucleotide to Sb, which weakens the interaction between the oligonucleotide and cationic surfactants. As a result, the event induces a planar-to-homeotropic orientational change of liquid crystals and a bright-to-dark optical change under crossed polars. This liquid crystal-based optical sensor exhibits a rapid response to Sb in 10 s, a detection range between 20 nM and 5 μM, and a detection limit at 6.7 nM calculated from 10-mins assay time. It also shows good selectivity against other metal ions including Ag, Cd, Cu, Fe, K, Mg, Mn, Na, Pb, and Zn. Moreover, this system can be used to detect Sb in aqueous solutions with different pH or ionic strengths. This simple, fast, and low-cost liquid crystal-based sensing approach with high sensitivity and selectivity has a high potential for detecting Sb in natural environments and industrial wastewater.

Antimony ion Cationic surfactant Liquid crystal Oligonucleotide Optical biosensor

English

First ; Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2021B1515020097];National Natural Science Foundation of China[62175098];National Natural Science Foundation of China[U22A20163];

CHEMISTRY

2-s2.0-85169825232

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,Xueyuan Road 1088,518055,China
2.Department of Chemical and Biomolecular Engineering,National University of Singapore,4 Engineering Drive 4, Singapore,117576,Singapore

Zhan，Xiyun,Yang，Kun Lin,Luo，Dan. Liquid crystal based sensor for antimony ions detection using poly-adenine oligonucleotides[J]. Talanta,2024,267.

Zhan，Xiyun,Yang，Kun Lin,&Luo，Dan.(2024).Liquid crystal based sensor for antimony ions detection using poly-adenine oligonucleotides.Talanta,267.

Zhan，Xiyun,et al."Liquid crystal based sensor for antimony ions detection using poly-adenine oligonucleotides".Talanta 267(2024).