Study of a Landolt-type reaction with ascorbic acid in a vesicular system by means of the quenching effect of iodine
Authors:
- Bernard Juskowiak,
- Walenty Szczepaniak
Abstract
The iodine quenching effect on the fluorescence of the binaphthyl-based amphiphile C
8
BNC
6
N, was applied to the monitoring of a Landolt-type reaction between hydrogen peroxide, potassium iodide and ascorbic acid. The vesicular system presented takes advantage of both the extremely high sensitivity of iodine detection (10
-8
M level) and the micellar "concentration effect" which permits the indicator reaction to be monitored at very low concentrations of substrates. Significant differences are observed compared with the conventional Landolt reaction: first, the optimum pH range is shifted towards higher pH values (pH 4-6), and second a strong concentration effect is observed for negatively charged ions which allows the sensitive determination of catalysts and substrates. A very sensitive method for the determination of ascorbic acid at levels down to 10 ng ml
-1
is proposed. The usefulness of the method was evaluated by the determination of ascorbic acid in food and body fluid samples. © 1992.
- Record ID
- UAM747d74b4ab98447291abe9e15ed31d9a
- Author
- Journal series
- Analytica Chimica Acta, ISSN 0003-2670
- Issue year
- 1992
- Vol
- 262
- Pages
- 79-86
- ASJC Classification
- ; ; ;
- DOI
- DOI:10.1016/0003-2670(92)80010-5 Opening in a new tab
- Language
- (en) English
- Score (nominal)
- 0
- Score source
- journalList
- Publication indicators
- = 11; = 13; : 1999 = 1.182; : 2006 (2 years) = 2.894 - 2007 (5 years) =3.348
- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAM747d74b4ab98447291abe9e15ed31d9a/
- URN
urn:amu-prod:UAM747d74b4ab98447291abe9e15ed31d9a
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.