Izvorni znanstveni članak
https://doi.org/10.5599/jese.2682
Rapid and sensitive electrochemical determination of flavonoids in Albanian wines using zeolite X and Prrenjasi clay as carbon paste modifiers
Nensi Isak
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
Muhamed Farruku
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
Xhensiana Ndreka
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
Sara Dervishi
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
Magdalena Cara
; Department of Plant Protection, Faculty of Agriculture and Environment, Agricultural University of Tirana, Albania
Edlira Baraj
; Departmentof Chemistry, Faculty of Mathematical Engineering and Physical Engineering, Polytechnic University of Tirana
Avni Berisha
; Faculty of Natural and Mathematics Science, University of Pristina, Pristina 10000, Kosovo
Arjan Korpa
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
Kledi Xhaxhiu
orcid.org/0000-0002-1798-3141
; Faculty of Natural Sciences, University of Tirana, Boulevard “Zogu I’’, 1001, Tirana, Albania
*
* Dopisni autor.
Sažetak
This study investigated the electrochemical determination of flavonoids in Albanian wines using carbon paste electrodes modified with various materials. We employed an ex-situ method to minimize interferences from complex wine matrices, focusing on catechins as flavonoids representatives. The modifiers included Zeolite type X, and clay from the Prrenjasi region in Albania. Differential pulse voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy were utilized to characterize the modified electrodes. Results indicated that the carbon paste electrode modified by Prrenjasi clay (PCME) exhibits the highest sensitivity, with the lowest electron transfer resistance and largest active surface area. Also, PCME was chosen for its linear background, low cost, and excellent sensitivity for total flavonoid determinations in Albanian wines. The method demonstrated a limit of detection of 99.3 nM and a limit of quantification of 331 nM. The catechin equivalent flavonoids in the analysed Albanian wine samples ranged between 513.13 and 2156.07 mg L⁻¹. The diffusion coefficient of catechin was determined to be 1.38×10-⁵ cm² s-1. A comparative analysis was also performed using UV-VIS spectrophotometry, which determined the total flavonoid content in each analysed wine. The study demonstrated the potential of using PCME carbon paste electrodes for reliable flavonoid quantification in Albanian wines.
Ključne riječi
Wine analysis; polyphenolic compounds; catechin oxidation; aluminosilicate solid; Albanian clay
Hrčak ID:
333147
URI
Datum izdavanja:
1.5.2025.
Posjeta: 521 *