Citation: SHI Wei-Ping, CAI Jie, YANG Ya-Ni, LUO Huan-Huan, LIU Bing-Qian, FU Qiu-Ping. Portable Glucose Meter for Detection of Mercury(Ⅱ) Ion[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(9): 1337-1343. doi: 10.19756/j.issn.0253-3820.191311 shu

Portable Glucose Meter for Detection of Mercury(Ⅱ) Ion

1.
School of Pharmacy, Guizhou University, Synthetic Pharmaceutical Engineering Laboratory of Guizhou Province, Guiyang 550025, China;
2.
College of Chemistry and Materials Engineering, Guiyang University, Guiyang 550025, China

Received Date: 9 May 2019
Revised Date: 19 July 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21605029, 21864007), the Science and Technology Foundation of Guizhou Province ([2017]5788 Qian Ke He Platform for talents), the Science and Technology Foundation of Guizhou Province ([2016]1032 Qian Ke He Ji Chu), the Introduction of Talents Scientific Research Foundation of Guizhou University ([2015]40 Gui Da Ren Ji He Zi), the Discipline and Master's Site Construction Project of Guiyang University by Guiyang City Financial Support Guiyang University[HC-2019].

Based on the specific recognition of T-Hg²⁺-T mismatched for mercury ions (Hg²⁺), a simple and sensitive method for detecting Hg²⁺ was developed by using Fe₃O₄ nano-magnetic beads (MB) as reaction platform and portable blood glucose meter (PGM) as detection means. Gold nanoparticles (AuNPs) were prepared by sodium citrate reduction. The surface of AuNPs was modified with sulfhydryl terminal-rich thymine (T) oligonucleotide probe (S1) and glucose oxidase (GOx). In the presence of Hg²⁺, functionalized AuNPs were captured by capture-probe (S2)-modified MB due to T-Hg²⁺-T coordination. The labeled GOx oxidized glucose (Glu) to gluconic acid and H₂O₂. Thus, the concentration of Glu in the reaction solution was reduced and could be detected quantitatively by PGM. The optimal conditions of the assay were as follows:the volume ratio of S2 and GOx was 1:3, the reaction time of Hg²⁺ was 2 h, and the hydrolysis time of Glu was 1 h. Under optimized conditions, the PGM response of the system had a good linear relationship with the logarithm of Hg²⁺ concentration. The linear range was 0.05-8.00 nmol/L, and the detection limit was 0.02 nmol/L (3σ). The recovery of Hg²⁺ in actual water samples was 97.8%-113.7%, and the relative standard deviation was 0.2%-1.3%, which met the detection requirements of Hg²⁺ in actual water samples.
- Thymine-Hg²⁺-Thymine,
- Fe₃O₄ nano-magnetic beads,
- Gold nanoparticles,
- Portable glucose meter,
- Mercury ion(Ⅱ)
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