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Study of a Landolt-type reaction with ascorbic acid in a vesicular system by means of the quenching effect of iodine

✍ Scribed by Bernard Juskowiak; Walenty Szczepaniak

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
669 KB
Volume
262
Category
Article
ISSN
0003-2670

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✦ Synopsis

Ah&act

The lodme quenciung effect on the fluorescence of the bmaphthyl-based ampluphde CsBNC,N, was applied to the momtormg of a Landolt-type reaction between hydrogen peroxide, potassium iodide and ascorbtc aad The veszular system presented takes advantage of both the extremely high sensltmty of mdme detection (10-s M level) and the nucellar "concentration effect" which pemuts the mduzator reaction to be monitored at very low concentrations of substrates S~ficant differences are observed compared urlth the conventtonal Landolt reactlon first, the optimum pH range IS shIfted towards tugher pH values (PH 4-6), and second a strong concentration effect IS observed for negatnrely charged Ions which allows the sensitive detemunatlon of catalysts and substrates A very sensitive method for the determmatlon of ascnrblc acid at levels down to 10 ng ml-' IS proposed The usefulness of the method was evaluated by the determmation of ascorbic and m food and body fluid samples

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