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Citation: WANG Zhen-Rui, QI Feng-Pei, LUO Miao, CAO Yi-Ming, LIU Hong-Tao, SU Jian-Ke, ZHANG Chang-Qing, LONG Li-Ping, LIU Chang-Hui. A Turn-On Near-Infrared Fluorescent Probe for Determination of Fe³⁺ and Antioxidant Capacity of Dark Teas[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(1): 112-118. doi: 10.19756/j.issn.0253-3820.181121 shu

A Turn-On Near-Infrared Fluorescent Probe for Determination of Fe³⁺ and Antioxidant Capacity of Dark Teas

1.
College of Materials and Chemical Engineering, Hunan Provincial Key Lab of Dark Tea and Jin-Hua, Hunan City University, Yiyang 413000, China;
2.
State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China

Received Date: 22 April 2018
Revised Date: 30 October 2018

Fund Project: This work was supported by the National University Student Innovation and Entrepreneurship Training Project (No.[2017]7), the Research Project on Innovation and Learning for College Students in the Ministry of Education (No.[2017]116), the National Natural Science Foundation of China (No. 21675042), the Hunan Natural Science Foundation (No. 2018JJ2017), the Research Foundation of Education Bureau of Hunan Province, China (No. 15B043) and the Open Fund of Hunan Provincial Key Lab of Dark Tea and Jin-Hua (No. HC6120).

A novel quinoline-based cyanine derivative of CyQ was facilely synthesized by the condensation reaction of 4-methyl quinoline and dialdehyde, and its structure was characterized by ¹H NMR and HRMS-ESI. Then, the target compound CyQ-cysteine (Cys) was obtained by halogen-mercapto nucleophilic substation reaction and then rearrangement reaction between CyQ and Cys. The results showed that ferric ion (Fe³⁺) could efficiently cause the fluorescence enhancement of CyQ-Cys, and the fluorescence intensity was linear with the Fe³⁺concentration in the range of 40-300 mmol/L with a regression equation of y=1.0619x + 0.01355 (R²=0.9910) and a detection limit of 10.4 μmol/L(S/N=3). In addition, by virtue of the excellent reductive properties of dark teas towards Fe³⁺, a NIR fluorescent method for assaying antioxidant capacity of dark teas was constructed by Fe³⁺-mediated off-on strategy.
- Ferric ion,
- Cysteine,
- Near-infrared probe,
- Dark teas,
- Antioxidant capacity
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1.
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