Selective Detection of Ascorbic Acid Using Octacyanomolybdate‐Doped‐Glutaraldehyde‐Cross‐Linked Poly‐L‐Lysine Film Modified Glassy Carbon Electrode

Abstract

The present work describes oxidation of ascorbic acid (AA) at octacyanomolybdate-doped-glutaraldehyde-crosslinked poly-l-lysine (PLL-GA-Mo(CN) ). Cyclic voltammetry and rotating disk electrode (RDE) techniques are used to investigate the electrocatalytic oxidation of ascorbic acid and compared with its oxidation at bare and undoped PLL-GA film coated electrodes. The rate constant of catalytic reaction k obtained from RDE analysis was found to be 9.5 Â 10 5 cm 3 mol À1 s À1. The analytical determination of ascorbic acid has been carried out using RDE technique over the physiological interest of ascorbic acid concentrations with a sensitivity of 75 mA mM

The immobilisation and reactivity of Fe(CN)63−/4− in an intrinsically microporous polyamine (PIM-EA-TB)

“…With Fe(CN) 6 3−/4− immobilised in the PIM-EA-TB electrode coating, it is possible to explore catalytic behaviour. Ferrocyanide (and related cyanometalates) has been employed as a homogeneous catalyst, for example, for the detection of ascorbic acid [54] or hydrogen sulphide [6]. Furthermore, ferrocyanide immobilised into Prussian blue derivatives has been used widely for many types of redox catalytic processes.…”

Economical, facile synthesis of network-like carbon nanosheets and their use as an enhanced electrode material for sensitive detection of ascorbic acid

“…3,44 To further evaluate the analytical performance of the NCN/ GCE for AA detection, different comparison aspects including applied potential, linear range and detection limit are listed in Table 1. The proposed method exhibits better than or comparable performance to those of the previous reports, 34,[45][46][47][48] suggesting that the carbon nanosheets can be directly used as an enhanced material for sensitive determination of AA.…”

Fe(CN)$\rm{ {_{6}^{4-}}}$‐Doped‐Glutaraldehyde‐Cross‐Linked Poly‐L‐Lysine Film Electrode. Part 1: Electrochemical Characterization and Its Electrocatalytic Activity Towards Oxidation of Ascorbic Acid

“…As shown in the inset, peak currents are deceases cycle after cycles, and only 40% of initial response was retained after 50 cycles. This is quite high compare to less than 15% decrease when Mo(CN) 4À 8 -doped-PLL-GA film electrode was cycled 50 cycles continuously in 0.1 M H 2 SO 4 [54]. However, original doping level could be achieved when the modified electrode was immersed in mediator solution after cycling 50 cycles in pure supporting electrolyte.…”