Development of a Cholesterol Biosensor by Chronoamperometric Deposition of Polyaniline-Ag Nanocomposites

Polyindole-ZnO Nanocomposite: Synthesis, Characterization and Heterogeneous Catalyst for the 3,4-Dihydropyrimidinone Synthesis under Solvent-free Conditions

“…UV-Vis spectra of polyindole show three characteristic bands at 352 nm, 398 nm and at 532 nm, respectively, Figure 1(b). UV-Vis spectra of Polyindole-ZnO shows additional peaks at 294 and 312 nm, which indicates ZnO inserted in polyindole matrix Figure 1(c) [17][18][19][20] .…”

“…Transition metal oxides have special physicochemical properties arising from quantum size effects and high surface areas, which may be different from their bulk counterparts [17][18][19][20] . Transition metal nanoparticles of ZnO are encapsulated into a shell of the conducting polymer resulting in the host nanocomposite.…”

“…The XRD analysis shows the major reflections between 30 to 70 o (2H values), which indicate more crystalline regions in the zinc oxide. The average crystalline size is $60 nm[17][18][19][20][21][22][23] .The XRD pattern of polyindole(Fig. 4b) shows sharp peaks at 11.4 , 12.4 , 17.6 , 20.06 , 23.6 , 26.2 , 27.3 and unusual sharp peak at 7.5 o , which indicates the partially crystalline nature of polyindole.…”

Fabrication and Optimization of ChE/ChO/HRP-AuNPs/c-MWCNTs Based Silver Electrode for Determining Total Cholesterol in Serum

“…Conversion of reduced state to oxidized state is done through direct transfer of electrons. In its 3D configuration HRP has heme group present in outer region which enhances the direct transfer of electrons between redox centre and conducting sites present on transducer [ 11 ]. Regeneration of HRP is done via direct electron transfer: Immobilizing enzyme on suitable support may lower the Michaelis constant K m or it may enhance bimolecular rate constant, which improves the biosensor performance [ 12 – 15 ].…”

“…Regeneration of HRP is done via direct electron transfer: Immobilizing enzyme on suitable support may lower the Michaelis constant K m or it may enhance bimolecular rate constant, which improves the biosensor performance [ 12 – 15 ]. Cholesterol hydrolysing enzymes ChO and ChE have been immobilized on conducting polymers [ 16 ] like polypyrrole films [ 17 ], PVC Strip [ 18 ], PB/polypyrrole (PPy) composite film [ 19 ], cellulose acetate/carbon electrode [ 20 ], cellulose acetate/Pt electrode [ 21 ], electropolymerised PPy films [ 22 ], poly 3-thiopheneacetic acid film/Pt electrode [ 23 ] and PANI–pTSA-Ag/ITO [ 11 ], and sol-gel films [ 24 ]. Evolution of nanoscale materials has revolutionised the field of biosensors also.…”