3.1.2.5. Chitosan-Modified Voltammetric Electrodes for Trace
Analysis:
Chemically modified Chitosan with electrochemical voltammetry has
enormous potential as efficient sorbent material for the detection of
environmental pollutants including pesticides, heavy metals and dyes.
The current difference between the reference and working electrodes
created by the reduction or oxidation of an electrochemical biosensor is
measured using a voltammetric biosensor. Anodic stripping voltammetry,
sweep voltammetry and cyclic voltammetry are used for determining heavy
metals with great sensitivity. Janegitza et al. (2009) demonstrated the
use of chitosan-supported adsorptive stripping voltammetry for the
quantification of Cu (II), Cd (II), and Hg (II) with good sensitivity in
electroanalysis of heavy metals.
Nickle oxide coupled chitosan electrochemical biosensor has been applied
for the estimation of an infective pathogen like E. coli andSalmonella typhi from environment and clinical samples (Solanki
et al., 2015). A large number of chitin and chitosan-based biosensors
have been designed till now and the above mentioned are the some of the
representative in this category (Suginta et al., 2013).