M.V. Sangaranarayanan

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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V., Sangaranarayanan
Sangaranarayanan, M. V.
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2012 - 20172
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    Publication
    Differential pulse voltammetry as an alternate technique for over oxidation of polymers: Application of electrochemically synthesized over oxidized poly (Alizarin Red S) modified disposable pencil graphite electrodes for simultaneous detection of hydroquinone and catechol
    (15-03-2017)
    Aravindan, N.
    ;
    M.V. Sangaranarayanan 
    We have demonstrated the effectiveness of differential pulse voltammetry (DPV) as a technique for the preparation of an over oxidized poly (Alizarin Red S) modified disposable pencil graphite electrode (o-PARS/PGE). The modified electrodes were analyzed using spectroscopic, electron microscopic and electrochemical techniques. As an application, the o-PARS/PGE was used for the simultaneous determination of hydroquinone (HQ) and catechol (CC) using DPV and double potential pulse chronoamperometry (DPCA). It was found that o-PARS/PGE exhibited an excellent electrocatalytic activity and differentiating ability towards HQ and CC with a peak separation of 100 mV. Under the optimized conditions, the calibration curves showed linearity in the range of 0.5–600 μM for both the isomers with a limit of detection (LOD, 3σ/m) of 0.452 μM and 0.122 μM for HQ and CC respectively. The practical viability of the fabricated electrode was demonstrated by the successful determination of HQ and CC in a tap water sample with satisfactory recovery. On comparison with other commonly employed electrochemical techniques for over oxidation, o-PARS/PGE prepared using DPV was found to be more sensitive.
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    Polypyrrole microfibres synthesized with Quillaja Saponin for sensing of catechol
    (01-10-2012)
    Ramya, R.
    ;
    M.V. Sangaranarayanan 
    The polypyrrole microfibres were synthesized potentiodynamically on platinum electrodes using the natural surfactant Quillaja Saponin. Employing amperometric and impedimetric techniques, the suitability of these electrodes as biosensors for catechol is investigated, in the presence of the enzyme Tyrosinase. The amperometric measurements reveal the linear concentration regime from 1 μM to 400 μM while the upper limit of detection using impedance studies is estimated as 200 μM. The fitting of the Nyquist and Bode' plots is carried to deduce the system parameters. The low magnitude of Michaelis-Menten constant (103 μM) suggests the high activity of the Tyrosinase enzyme. The temporal stability of the electrode has been estimated and the effect of interference from phenol, resorcinol and ascorbic acid is also investigated. © 2012 Elsevier B.V.