Naslov
Measurement of Stevioside by Square-Wave Polarography

Autori
Komorsky-Lovrić, Šebojka ; Novak, Ivana ; Novak, Bruno

Izvornik
Electroanalysis (1040-0397) 22 (2010), 19; 2211-2215

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Stevia ; steviol ; stevioside ; square-wave voltammetry

Sažetak
Steviol glycosides are electroactive compounds and can be detected by mercury electrode. The maxima of square-wave voltammograms of steviol and stevioside appear at -1.3 V vs Ag/AgCl in 1 M NaCl at approximately pH 11. The responses are quasireversible and probably caused by electro-reduction of carboxyl, or ester groups, respectively. The net peak current is linearly proportional to steviol concentration between 1 x 10-6 mol/L and 3.5 x 10-5 mol/L. This calibration plot can be used for the determination of the concentration of stevioside in extracts of stevia (Stevia rebaudiana Bertoni) leaves. The proposed method is applicable for routine analysis of stevioside in commercial products.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Poljoprivreda (agronomija), Prehrambena tehnologija

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