NDLI: Enantioselective electrochemical sensor for R-mandelic acid based on a glassy carbon electrode modified with multi-layers of biotin-loaded overoxidized polypyrrole and nanosheets of reduced graphene oxide

Content Provider	Springer Nature Link
Author	Borazjani, Marjan Mehdinia, Ali Ziaei, Ehsan Jabbari, Ali Maddah, Mina
Copyright Year	2016
Abstract	The authors describe an electrochemical method for quantitation of R-mandelic acid (R-MA). A glassy carbon electrode (GCE) was modified by electrochemical deposition of several layers of D-(+)-biotin-loaded overoxidized polypyrrole (OPPy-biot) on nanosheets of reduced graphene oxide. The deposited film was characterized by scanning electron microscopy, differential pulse voltammetry, cyclic voltammetry and electrochemical impedance spectroscopy. The modified GCE is shown to enable stereoselective recognition of R-MA even in the presence of high concentrations of S-mandelic acid (S-MA), best at a voltage of around 1.5 V (vs. Ag/AgCl). The analytical performance of the electrode was studied by differential pulse voltammetry which revealed a linear range that extends over the 5 to 80 mM R-MA concentration range, a 1.5 mM detection limit, and an enanotiospecific characteristic toward R-MA. Under optimum conditions, the method displays high reproducibility and stability. It was applied to the determination of R-MA in a synthetic mixture and no interference was observed by S-MA. Graphical abstract Multi-layered of D-(+)-biotin-loaded overoxidized polypyrrole film on the nanosheets of reduced graphene oxide-modified glassy carbon electrode was fabricated by electrochemical deposition, which are shown to enable enantioselective determination of R-mandelic acid in the presence of high concentration of S-mandelic acid.
Starting Page	611
Ending Page	620
Page Count	10
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	184
Issue Number	2
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2016-12-19
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chiral recognition Enantiorecognition Circular dichroism Scanning electron microscopy Differential pulse voltammetry Cyclic voltammetry Electrochemical impedance spectroscopy Racemic solution Nanochemistry Nanotechnology Characterization and Evaluation of Materials Analytical Chemistry Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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