Digitální knihovnaUPCE
 

Voltammetric determination of ethylvanillin and methylvanillin sum at carbon paste electrode modified by sodium dodecyl sulfate in selected foodstuffs

Článekpeer-reviewedpublished

Abstrakt

A new voltammetric method without using high cost and health risk nanomaterials has been developed for quantitative determination of ethylvanillin and methylvanillin sum, compounds that are used as food additives. The method is based on direct electrochemical oxidation of these biologically active compounds using square wave voltammetry at carbon paste electrode with surface modified by sodium dodecyl sulfate (SDS/CPE) performed in 0.1 M phosphate pH 6.0 buffer. Working conditions such as pH value of supporting electrolyte, type of surfactant, accumulation time of surfactant, and parameters of square wave voltammetry were optimized. In comparison with bare carbon paste electrode, excellent reproducibility characterized by a relative standard deviation of approximately 0.3% was obtained at the SDS/CPE. Linear range from 1.0 x 10(-6) to 2.0 x 10(-5) M, limits of quantification 9.8 x 10(-8) M and detection 2.9 x 10(-8) M were found at pulse amplitude 70 mV and frequency 50 Hz selected as optimum for ethylvanillin quantification. For methylvanillin, a linear range from 7.0 x 10(-8) to 2.0 x 10(-5) M and limits of quantification 7.0 x 10(-8) M and detection 2.0 x 10(-8) M were also determined. The procedure was validated using standard high-performance liquid chromatography method in the analysis of selected complex foodstuffs such as commercial baking sugar, biscuits, and an alcoholic drink. The results showed that a direct voltammetric approach is economically advantageous and reliable for the determination of ethyl- and methylvanillin, which is fully comparable to the reverse phase HPLC used as the ISO standard.

Rozsah stran

p. 1945-1953

ISSN

0026-9247

Trvalý odkaz na tento záznam

Projekt

Zdrojový dokument

Monatshefte fur Chemie, volume 149, issue: 11

Vydavatelská verze

https://link.springer.com/content/pdf/10.1007%2Fs00706-018-2266-z.pdf

Přístup k e-verzi

pouze v rámci univerzity

Název akce

ISBN

Studijní obor

Studijní program

Signatura tištěné verze

Umístění tištěné verze

Přístup k tištěné verzi

Klíčová slova

Carbon paste electrode, surfactant, square wave voltammetry, ethylvanillin, methylvanillin, food additives, food analysis, Uhlíková pastová elektroda, povrchově aktivní látka, square wave voltametrie, ethylvanilin, methylvanilin, aditiva potravin, analýza potravin

Endorsement

Review

item.page.supplemented

item.page.referenced