Determination of the total polyphenols content and antioxidant activity of Echinacea Purpurea extracts using newly manufactured glassy carbon electrodes modified with carbon nanotubes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15510%2F20%3A73603978" target="_blank" >RIV/61989592:15510/20:73603978 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/2227-9717/8/7/833/htm" target="_blank" >https://www.mdpi.com/2227-9717/8/7/833/htm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/pr8070833" target="_blank" >10.3390/pr8070833</a>

Result language

angličtina

Original language name

Determination of the total polyphenols content and antioxidant activity of Echinacea Purpurea extracts using newly manufactured glassy carbon electrodes modified with carbon nanotubes

Original language description

A sensitive electrochemical method was used for the determination of the total phenolic content and antioxidant activity of Echinacea purpurea extracts. In this study, 3 glassy carbon electrodes (GCE) were used: one unmodified and the other two newly manufactured glassy carbon electrodes modified with carbon nanotubes (CNTs) and chitosan (CS) in different concentrations, having the following composition: 1 mg/mL CNTs/CS 5%/GCE and 20 mg/mL CNTs/CS 0.5%/GCE. The determinations were performed on 3 diferent pharmaceutical forms (capsules, tablets and tincture), which contain E. pururea extract from the root or aerial part of the plant. Standard chicoric and caftaric polyphenolic acids, as well as food supplements extracts, were characterized using voltammetry, in a Britton-Robinson (B-R) electrolyte buffer. The modified 1 mg/mL CNTs/CS 5%/GCE electrode has superior properties compared to the other two (the unmodified and 20 mg/mL CNTs/CS 0.5%/GCE-modified) electrodes used in the study. Echinacea tincture had the highest antioxidant capacity and the biggest total amount of polyphenols (28.72 mg/equivalent of 500 mg powder). Echinacea capsules had the lowest antioxidant capacity, but also the lowest total amount of polyphenols (19.50 mg/500 mg powder); similarly, tablets had approximately the same values of polyphenols content (19.80 mg/500 mg powder), and also antioxidant capacity. The total polyphenol content was consistent with the one indicated by the manufacturers. Pulse-differential cyclic voltammetry represents a rapid, simple and sensitive technique to establish the entire polyphenolic amount and the antioxidant activity of the E. purpurea extracts.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10406 - Analytical chemistry

Project

—

Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2020

Confidentiality

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

Name of the periodical

Processes

ISSN

2227-9717

e-ISSN

—

Volume of the periodical

8

Issue of the periodical within the volume

JUL

Country of publishing house

CH - SWITZERLAND

Number of pages

8

Pages from-to

1-8

UT code for WoS article

000554300600001

EID of the result in the Scopus database

2-s2.0-85088513709