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An automated sequential injection (SI) spectrophotometric system has been developed for evaluation of tyramine oxidase (TOD) inhibitory activity. The method is based on the inhibition of TOD that catalyzes the oxidation of tyramine substrate to produce aldehyde and hydrogen peroxide (H 2 O 2 ). The produced H 2 O 2 reacts with vanillic acid and 4-aminoantipyrine (4-AA)...
A sequential injection (SI) spectrophotometric method with absorbance detection at 475nm has been developed for evaluating activity of some compounds on an inhibition of the mushroom tyrosinase. The method involved a reaction of 3,4-dihydroxyphenylalanine (l-DOPA) and mushroom tyrosinase to form the o-dopaquinone. The decrease of the o-dopaquinone was related to an increase of tyrosinase-inhibitory...
. Chitosan resin functionalized with 3,4-dihydroxy benzoic acid (CCTS-DHBA resin) was used as a packing material for flow injection (FI) on-line mini-column preconcentration in combination with inductively coupled plasma-atomic emission spectrometry (ICP-AES) for the determination of trace elements such as silver, bismuth, copper, gallium, indium, molybdenum, nickel, uranium, and vanadium in environmental...
A new type of a reactor column, a crushed BaSO 4 reactor column used for the flow injection spectrophotometric determination of sulfate ion using the exchange reaction of sulfate ion and barium-dimethylsulfonazo III is proposed. The column is very simple and economical. It can be continuously used for 8h before washing with water for repeated usage of at least 1 month. The procedure is sensitive...
New spectrophotometer was designed for the simultaneous assay of copper and iron using flow injection analysis and moreover, new 50 mm light path cells were equipped in the spectrophotometer to enhance the sensitivity. Both copper and iron at 2-10 ppb level were determined simultaneously and rapidly using water soluble reagent, 5-Br-PSAA. Determination limits were 1 ppb for copper and 1 ppb for iron...
A modified FIA method was developed for the determination of sulphur dioxide (SO 2 ) in ambient air collected by a passive sampler. SO 2 was oxidized by hydrogen peroxide and determined as sulphate ion in solution. Barium-dimethylsulfoazo-III complex was used as spectrophotometric reagent. A BaSO 4 -immobilized in-line reaction column was introduced into the flow system to...
Photo-sensitized oxygenation of phenethylguanidoxime led to the effective production of an expected urea derivative along with generation of nitric oxide (NO) or its equivalent. The formation of both products could be reasonably explained by the mechanism based on singlet oxygen ene reaction of olefins. This should give a possible chemical model for the biological oxidation of N ω -hydroxy-L-arginine...
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