A new transducer based on a screen-printed carbon electrode has been developed for the quantification of thiram. Detection this fungicide is performance two enzymes: (1) aldehyde dehydrogenase catalyzes oxidation using NAD+ as cofactor and simultaneously, (2) diaphorase reoxidizes NADH formed in first enzymatic process due to presence hexacyanoferrate(III) which reduced hexacyanoferrate(II). Ta...

A method for the colorimetric estimation of manganese by reduction of the phosphomolybdicphosphotungstic acid phenol reagent has been described (Abul-Fadl, 1948). Cobalt was also found to give a similar colour reaction in the presence (but not in the absence) of amino-acids. Conversion of cobalt into the cobaltinitrite did not affect its response to this reaction. As methods for the estimation ...

Metal hexacyanometallates, or Prussian blue analogs (PBAs), are active materials in important electrochemical technologies, including next-generation sodium- and potassium-ion batteries. They have tunable properties, reduction potential, ionic conductivity, color. However, little is known about their electronic conductivities. In this work, we use density-functional theory to model the structur...

Anaerobic reactions of Rhus vernicifera laccase and its type-2 copper-depleted derivatives with hexacyanoferrate(II) were investigated by absorption and e.s.r. spectroscopy. When native laccase was treated with excess hexacyanoferrate(II), the type-1 and type-2 coppers were immediately reduced and the e.s.r. signal due to type-3 copper was transiently observed. After incubation, a novel e.s.r. ...

A novel electrochemical immunosensor based on the principles of liposome signal ampli®cation and immunochromatography has been developed for the determination of theophylline. The immunosensor is composed of two major parts including a screen-printed electrode and an immunochromatographic nitrocellulose membrane strip. On the membrane, anti-theophylline antibody is immobilized in an antibody co...

L-Ascorbic acid (AsA) is known for its reductive properties and for its use on a wide scale as an antioxidant agent in foods and drinks; it is also important for therapeutic purposes and biological metabolism. Therefore, recent advances in the food and pharmaceutical industries and the need for nutritional assessments necessitate the development of a selective, simple and accurate method to det...