Naslov
A spectrophotometric Study on Amylose-Iodine Complex Formation in Aqueous and Nonaqueous Solvent

Autori
Gojmerac Ivšić, Astrid ; Crnogaj, Irena

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28th International Conference on Solution Chemistry Book of Abstracts / - Deberecen, 2003

Skup
28th International

Mjesto i datum
Debrecen, Mađarska, 23.08.2003. - 28.08.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
amylose-iodine complex; iodide; iodine; nonaqueous solvent; spectrophotometry;

Sažetak
The blue iodine-starch adsorption compound has found widespread application for determination of iodine or starch concentration in various samples as well as the color indicator in iodimetric and iodometric methods. The nature of the coloured species has been the subject of much speculation and controversy. In the present work the reaction between amylose and iodine has been studied by spectrophotometry in water and water containing varying proportions of nonaqueous solvents. It has been established that the characteristic blue complex exhibits a broad and asymetric absorption peak with its maximum near 600 nm and a shoulder at about 480 nm. The position and the intensity of the absorption bands depend on the amylose iodine ratio, presence of the iodide and the amount of the nonaqueous solvent added. The increased iodide koncentration is accompained by corresponding shift in the positions of the UV/VIS absorption maxima. The amount of the nonaqueous solvent added remarkably reduce the intensity values around 600 nm. In order to resolve overlapping peaks that appeared in the absorption spectrum, the derivatives of these spectra were analysed.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA