Naslov
Investigation of electrochemical properties of some chlorogenic acids using differential pulse voltammetry

Autori
Tomac, Ivana ; Šeruga, Marijan

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

Izvornik
Book of abstracts 9th International Scientific and Professional Conference WITH FOOD TO HEALTH / Šubarić, Drago ; Jašić, Midhat - Osijek : Tuzla : Prehrambeno tehnološki fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku ; Farmaceutski fakultet Univerziteta u Tuzli, 2016, 63-63

ISBN
978-953-7005-41-2

Skup
9th International Scientific and Professional Conference WITH FOOD TO HEALTH

Mjesto i datum
Osijek, Hrvatska, 13.10.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Electrochemical properties; Chlorogenic acids; Differential pulse voltammetry; Coffee

Sažetak
The electrochemical properties of chlorogenic acids (CGAs) isomers: three caffeoylquinic acids, CQAs (5-CQA, 4-CQA, 3-CQA) and three dicaffeoylquinic acids, diCQAs (3, 4-diCQA, 3, 5- diCQA, 4, 5-CQA) were studied by differential pulse voltammetry (DPV) method. The study has shown that electrochemical properties of CQAs and diCQAs are strongly dependent on their chemical structure and electronic properties, particularly on presence of electron-donating – OH and –CH=CH– groups, and a strong electron- withdrawing effect of ester (–COOR) group presented in their structures. DPV measurements have shown that electrochemical oxidation/reduction process of investigated CQAs and diCQAs at a GCE is reversible, pH dependent, two electron-two proton process. The oxidation/reduction process occured on catechol moiety in the structure of these molecules. The electrochemical properties of 5-CQA (main CGAs in coffee) were investigated more in detail. It was observed that anodic oxidation peak current of 5-CQA show its maximum in PBS solution of pH 7. A linear relationship of the anodic peak current with the concentration of 5-CQA in the concentration range of 5-50 μmol L-1 was observed, with LOD of 1.2·10-6 mol L-1. DPVs of coffee samples have shown that electrochemical properties of coffee extracts were very similar to that of investigated CGAs. Therefore, DPV was used for determination of CGAs in coffees. It was shown that DPV is a very sensitive and selective method for determination of total CGAs content in coffee.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Prehrambena tehnologija

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