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Articles by A.T. Lawal
Total Records ( 3 ) for A.T. Lawal
  A.T. Lawal and G.G. Wallace
  Gas phase electrochemical polymerization of pyrrole was investigated in which platinum electrode coated with Nafion dopant was exposed to pyrrole vapour. Homogeneous and thin conductive films were uniformly fabricated at nano level thickness. The polypyrrole obtained were characterized by cyclic voltammetry. Experimental parameters such as the Nafion concentration, polymerization time and current density were investigated. The parametric study has been investigated in order to synthesize homogeneous film in a reproductive manner.
  A.T. Lawal and S.B. Adeloju
  A biosensor is developed by co-entrapment of Purin Nucleoside Phosphorylase (PNP) and xanthine oxidase (XOD) and potassium ferrocyanide (K4Fe(CN)6 into a polypyrrole (PPy) film via galvanostatic polymerisation of pyrrole. The optimum conditions for formation of the PPy-PNP-XOD-Fe(CN)64- film are 0.3 M pyrrole. 6.2 U mL-1 XOD, 49 U mL-1 PNP, 40 mM K4Fe (CN)6, polymerisation period of 200 sec and an applied current density of 0.5 mA cm-2. The optimum potential for the amperometric biosensing of phosphate was 200 mV vs Ag/AgCl (3 M KCl) in 0.05 M barbitone buffer. The achievable linear concentration range was between 0.1 and 1 mM, while the minimum detectable amount was 10 μM.
  A.T. Lawal and S.B. Adeloju
 

A biosensor is developed for the determination of hypoxanthine (Hx) by entrapment of XOD and a mediator, ferrocene or potassium ferrocyanide, (K4Fe(CN)6, into a PPy film during galvanostatic film formation. The optimum conditions for the formation of PPy-XOD-Fe(CN)64- film include 0.4 M pyrrole, 6.2 U mL-1 XOD, 40 mM K4Fe(CN)6, polymerisation period of 200 sec and an applied current density of 0.5 mA cm-2. Potentiometric modes of detection, was investigated. The potential for the potentiometric biosensing of Hx was 0.0 mV vs. Ag/AgCl (3 M KCl) in 0.05 M phosphate buffer. It is revealed that potentiometric detection was sensitive and gave a wider linear concentration range. The PPy-XOD potentiometric biosensor was successfully used for the determination of fish freshness.

 
 
 
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