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Zeolite encapsulated Ni(II)-Schiff-base complex: A novel size-selective electro-catalyst for the determination of the purity of stevioside

Rashvand Avei, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.talanta.2013.02.055
  3. Publisher: 2013
  4. Abstract:
  5. Ship-in-a-bottle complex of nickel(II) containing the ligand N,N′-bis(2,4-dihydroxyacetophenone)-2,2-dimethylpropandiimine (H 2{salnptn(4-OH)2}) has been synthesized in zeolite Y. The characteristics of the encapsulated complex are identified by the methods of EDX, SEM, XRD, FT-IR and cyclic voltammetry. A catalytic effect in the electrochemical oxidation of glucose, fructose and sucrose, and a blocking effect in stevioside oxidation are demonstrated on the Ni II{salnptn(4-OH)2}-Y/CPE. The effects of some parameters, such as potential scan rate and concentration of carbohydrates are investigated. The rate constants for the catalytic reaction (k′) of carbohydrates are also obtained. The size-selective electro-catalyst shows a good linear dependency on carbohydrates' concentration in the range of 0.01-0.06 M with the detection limit of 6.4 mM at the signal-to-noise ratio of 3. Furthermore, the modified electrode exhibits no interference with the simultaneous presence of stevioside. In brief, these results demonstrate that NiII{salnptn(4- OH)2}-Y composites have a great potential for synthesizing size-selective electrocatalysts for determining the purity of stevioside
  6. Keywords:
  7. DFT ; Modified electrodes ; NaY zeolite ; Schiff-base complexes ; Steviosides ; Bottles ; Catalytic oxidation ; Cyclic voltammetry ; Electrocatalysts ; Electrochemical oxidation ; Encapsulation ; Rate constants ; Catalyst activity ; Glucoside ; kaurane derivative ; Schiff base ; Stevioside ; Zeolite ; Chemistry ; Electrode ; Infrared spectroscopy ; Scanning electron microscopy ; Carbohydrates ; Catalysis ; Diterpenes, Kaurane ; Electrodes ; Glucosides ; Microscopy, Electron, Scanning ; Nickel ; Powder Diffraction ; Spectroscopy, Fourier Transform Infrared ; X-Ray Diffraction ; Zeolites
  8. Source: Talanta ; Volume 108 , April , 2013 , Pages 19-29 ; 00399140 (ISSN)
  9. URL: http://www.sciencedirect/science/article/pii/S003991401300129X