Simultaneous determination of vitamin E and vitamin K in food supplements using adsorptive stripping square-wave voltammetry at glassy carbon electrode

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916074" target="_blank" >RIV/00216275:25310/20:39916074 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3390/app10144759" target="_blank" >https://doi.org/10.3390/app10144759</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/app10144759" target="_blank" >10.3390/app10144759</a>

Result language

angličtina

Original language name

Simultaneous determination of vitamin E and vitamin K in food supplements using adsorptive stripping square-wave voltammetry at glassy carbon electrode

Original language description

A new voltammetric method for the simultaneous determination of vitamin E and vitamin K present in different types of commercially available food supplements has been developed. This electroanalytical method is based on the ex situ adsorptive accumulation of these biologically active compounds onto the surface of a solid glassy carbon electrode (GCE) with subsequent electrochemical detection by square-wave adsorptive stripping voltammetry in 0.01-mol L(-1)HNO(3)containing 0.1-mol L-1KCl at pH 2.08. Due to reversible electrochemical reactions of phylloquinone, a subsequent voltammetric detection of both vitamins in anodic mode can be performed. Since individual forms of vitamins E and K usually exhibit nearly identical electrochemical behavior, it is therefore impossible to distinguish individual forms (quinones and tocopherols) and determine their molar concentrations in this way. Thus, the values of vitamin content were expressed as mass equivalent of phylloquinone and alpha-tocopherol as they are the most biologically active forms. Despite the high sensitivity, relatively short linear ranges were obtained due to the interaction (competition) of both vitamins during adsorption onto the freshly polished surface of the GCE from a 50% aqueous-acetonitrile mixture. The obtained results showed that the voltammetric approach is a very simple and low-cost analytical method that can be used in analyses of food supplements.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/GA20-01589S" target="_blank" >GA20-01589S: New strategies for improving sensing properties of novel electrode materials via their surface pretreatment or modification</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Science - Basel

ISSN

2076-3417

e-ISSN

—

Volume of the periodical

10

Issue of the periodical within the volume

14

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

4759

UT code for WoS article

000554772200001

EID of the result in the Scopus database

2-s2.0-85088628661