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A highly simplified and rapid enzymatic procedure for the determination of lactulose was developed. Lactulose was hydrolysed to fructose and galactose by β-galactosidase, and the amount of fructose was determined by using immobilized fructose dehydrogenase and K 3 [Fe(CN) 6 ] as mediator. The reduced mediator was re-oxidised at a screen-printed Pt-electrode at a potential of 385 mV...
Acetylcholinesterase was immobilised on magnetic particles and integrated in a flow-injection system via a magnetic reactor. Enzyme activity was determined amperometrically using acetylthiocholine chloride as enzyme substrate. This system was applied to enzyme inhibition tests. Inhibition constants and lower detection limits were determined for carbofuran, paraoxon, malaoxon and paraoxon-methyl...
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