Voltammetric enantiomeric differentiation of tryptophan by using multiwalled carbon nanotubes functionalized with ferrocene and β-cyclodextrin

被引：72
作者：
Niu, Xiaohui [1 ]
Yang, Xing [1 ]
Mo, Zunli [1 ]
Guo, Ruibin [1 ]
Liu, Nijuan [1 ]
Zhao, Pan [1 ]
Liu, Zhenyu [1 ]
Ouyang, Meixuan [1 ]
机构：
[1] Northwest Normal Univ, Coll Chem & Chem Engn, Res Ctr Gansu Mil & Civilian Integrat Adv Struct, Minist Educ China,Key Lab Ecoenvironm Related Pol, Lanzhou 730070, Gansu, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2019年 / 297卷
基金：
中国国家自然科学基金;
关键词：
Electrochemical recognition; Chiral sensor; pi-pi stacking; Covalent crosslinking; Tryptophan enantiomers; ELECTROCHEMICAL ENANTIOSELECTIVE RECOGNITION; CHIRAL RECOGNITION; TETRACARBOXYLIC ACID; COMPOSITE; GRAPHENE; SENSOR; ENANTIORECOGNITION;
D O I：
10.1016/j.electacta.2018.12.041
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Two types of ferrocene-functionalized multiwalled carbon nanotubes (MWCNTs) are described. The first was obtained by adsorption of ferrocene (Fc) on MWCNTs via pi-pi stacking and is referred to as Fc/MWCNTs. The second was prepared via a conjugation reaction between ferrocenecarboxylic acid and aminated MWCNTs to result on covalently modified MWCNTs referred to as MWCNT-Fc. MWCNT/Fc has a better conductivity than MWCNT-Fc. But electrochemical recognition results clearly showed the MWCNTs-Fc/beta-CD/GCE can exhibit better chiral recognition ability to tryptophan enantiomers than beta-CD/Fc/MWCNTs/GCE. By combining the merits of beta-cyclodextrin (beta-CD) and MWCNTs-Fc, an electrochemical sensor for L-tryptophan was obtained. Its characterizations by SEM, TEM, TGA, Raman spectroscopy and XPS showed that the Fc/MWCNTs and MWCNTs-Fc have successfully been synthesized. Enantioselective recognition was accomplished by differential pulse voltammetry. Tryptophan enantiomers can be differentiated with an enantioselectivity coefficient (I-D-T-rp/IL-Trp) of 5.78. Moreover, the chiral recognition mechanism of beta-CD recognition tryptophan enantiomers was proposed. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：650 / 659
页数：10
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