NDLI: One step electrochemical synthesis of gold-nanoparticles–polypyrrole composite for application in catechin electrochemical biosensor

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One step electrochemical synthesis of gold-nanoparticles–polypyrrole composite for application in catechin electrochemical biosensor

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Analytical Methods Vol - 5 Issue - 3

Analytical Methods Vol -4

Analytical Methods Vol -3

Analytical Methods Vol -2

Analytical Methods Vol -1

One step electrochemical synthesis of gold-nanoparticles–polypyrrole composite for application in catechin electrochemical biosensor

Content Provider	Royal Society of Chemistry (RSC)
Author	Singla, M. L. Singh, Suman Jain, D. V. S.
Copyright Year	2013
Abstract	An electrochemical biosensor has been fabricated for catechin detection using the nanoparticle–polymer composite as a matrix. The composite has been electrochemically synthesized and tyrosinase enzyme was entrapped during polymerization of the composite material. The composite has been characterized for its morphology, optical, structural, and electrochemical behavior. Studies revealed that the presence of gold nanoparticles (AuNPs) in the polymer matrix resulted in an increase in conductivity, enhanced current intensity and diffusion coefficient. The AuNPs–PPy composite provided large surface area for enzyme immobilization and facilitated electron transfer, evident from almost 10% enhancement in biosensor response in the presence of nanoparticles (NPs). For catechin detection, the biosensor showed well defined redox peaks at 0.24 V/0.14 V for the redox reaction of the hydroxyl group present in the catechol moiety of the catechin and a weak oxidation peak at 0.62 V corresponding to the oxidation of the hydroxyl group present in the central ring of catechin. The linearity was achieved from 1 × 10−9 M to 1 × 10−8 M, with a sensitivity of 6.8 × 10−5 A M−1. The limit of detection (3 × SD/sensitivity) and Km value are 1.2 × 10−9 M and 4.5 × 10−9 M respectively. The response time of the biosensor was about 10–12 s with an optimum pH at 7.0. The biosensor has been tested for catechin detection in water and apple juices and the response was within 10% error.
Starting Page	1024
Ending Page	1032
Page Count	9
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	5
Issue Number	4
Journal	Analytical Methods
DOI	10.1039/c2ay26201k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Catechin Enzyme Polymerization Redox Polymer Catechol Composite material Hydroxy group Biosensor Electrochemistry PH Diffusion Immobilized enzyme Tyrosinase
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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