Crown ether modified poly(hydroquinone)/carbon nanotubes based electrochemical sensor for simultaneous determination of levodopa, uric acid, tyrosine and ascorbic acid in biological fluids

被引:39
作者
Atta, Nada F. [1 ]
Galal, Ahmed [1 ]
El-Gohary, Asmaa R. [1 ]
机构
[1] Cairo Univ, Fac Sci, Chem Dept, Giza 12613, Egypt
关键词
Levodopa; Uric acid; Tyrosine; Ascorbic acid; Parkinson's disease; Benzo-12-crown-4; Hydroquinone polymer; Carbon nanotubes; GLASSY-CARBON ELECTRODE; VITAMIN-C SUPPLEMENTATION; L-DOPA; ULTRASENSITIVE DETERMINATION; VOLTAMMETRIC DETERMINATION; SELECTIVE DETERMINATION; PASTE ELECTRODE; SERUM; COMPOSITE; NANOPARTICLES;
D O I
10.1016/j.jelechem.2020.114032
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Tyrosine (Ty) is an important amino acid that converts to levodopa (L-DOPA) which is used for treatment of Parkinson's disease (PD). Also, there is a correlation between UAlevels and the risk of progression of PDas significantly low level of serum uric acid (UA) is a biomarker for Parkinson. Thus, it is important to detect L-DOPA and UA in presence of interfering compounds for monitoring PD disease. An electrochemical sensor is fabricated by the modification of glassy carbon electrode with successive layers of carbon nanotubes (CNT), poly(hydroquinone) (PHQ) and benzo12-crown-4 (CE) for the simultaneous determination of L-DOPA, UA and Ty in biological fluids. CE is introduced for the first time as a receptor for L-DOPA, UA, Ty and ascorbic acid (AA). Stable host-guest complexes are formed between CE and these biologically compounds. L-DOPA, UA, Ty and AA are determined in the concentration ranges of 0.005-20 mu M, 0.005-25 mu M, 0.03-170 mu M and 0.1-50 mu M with detection limit values of 0.221 nM, 0.769 nM, 1.31 nM and 3.32 nM, respectively. Furthermore, the sensor possessed excellent anti-interference capability for simultaneous determination of L-DOPA, UA, Ty and AA or folic acid (FA). Recovery tests of the studied compounds were attained with excellent results. (c)(C) 2020 Elsevier B.V. All rights reserved.
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页数:14
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