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master's thesis
Elektrokemijska karakterizacija p-kumarinske kiseline
2024. urn:nbn:hr:182:165757
Vukić, Maja
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry

Cite this document

Vukić, M. (2024). Elektrokemijska karakterizacija p-kumarinske kiseline (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:165757

Vukić, Maja. "Elektrokemijska karakterizacija p-kumarinske kiseline." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2024. https://urn.nsk.hr/urn:nbn:hr:182:165757

Vukić, Maja. "Elektrokemijska karakterizacija p-kumarinske kiseline." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2024. https://urn.nsk.hr/urn:nbn:hr:182:165757

Vukić, M. (2024). 'Elektrokemijska karakterizacija p-kumarinske kiseline', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 08 July 2024, https://urn.nsk.hr/urn:nbn:hr:182:165757

Vukić M. Elektrokemijska karakterizacija p-kumarinske kiseline [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2024 [cited 2024 July 08] Available at: https://urn.nsk.hr/urn:nbn:hr:182:165757

M. Vukić, "Elektrokemijska karakterizacija p-kumarinske kiseline", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:182:165757

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Metadata
TitleElektrokemijska karakterizacija p-kumarinske kiseline
Title (english)Electrochemical characterization of p-coumaric acid
AuthorMaja Vukić
MentorMartina Medvidović-Kosanović (mentor)
Committee memberElvira Kovač-Andrić (predsjednik povjerenstva)
Committee memberMartina Medvidović-Kosanović (član povjerenstva)
Committee memberOlivera Galović (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry)
Osijek
Defense date and country2024-07-08, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Physical Chemistry
Abstract
Ovim radom ispitivana su elektrokemijska svojstva p-kumarinske kiseline cikličkom i diferencijalnom pulsnom voltametrijom. Cilj ovog diplomskog rada bio je ispitati utjecaj pH vrijednosti, brzine polarizacije elektrode i koncentracije p-kumarinske kiseline na njena oksido-redukcijska svojstva, te ispitati adsorpciju p-kumarinske kiseline na površinu radne elektrode i detektirati p-kumarinsku kiselinu u realnim uzorcima. Mjerenja su provedena pomoću PalmSens potenciostata/galvanostata kontroliranog s PSTrace 1.2. računalnim programom. Mjerenja su izvedena u elektrokemijskoj ćeliji s troelektrodnim sustavom koji se sastoji od radne elektrode od staklastog ugljika, referentne Ag/AgCl elektrode i protuelektrode platinske žice. Sustav je prije svakog mjerenja propuhan argonom visoke čistoće (φAr = 99,999 %). Ciklički voltamogrami pokazali su oksidacijski strujni vrh, što ukazuje na oksidaciju hidroksilne skupine p-kumarinske kiseline, pri čemu je utvrđeno da je proces kontroliran difuzijom. Diferencijalni pulsni voltamogrami pokazali su da se visina oksidacijskog strujnog vrha p-kumarinske kiseline mijenja s promjenom pH vrijednosti, pri čemu je optimalna pH vrijednost za oksidaciju pri pH = 3,0. U realnim uzorcima (sok od jabuke, mrkve, limuna i šipka) detektirana je p-kumarinska kiselina u koncentracijskom području od 2 μM. do 9 μM.
Abstract (english)
In this study, the electrochemical properties of p-coumaric acid were determined by using cyclic and differential pulse voltammetry. The study aimed to examine the influence of pH, scan rate, and p-coumaric acid concentration on its redox properties, to study the adsorption of p-coumaric acid on the surface of the working electrode and to detect p-coumaric acid in real samples. Measurements were performed by using a PalmSens potentiostat/galvanostat controlled by the PSTrace 1.2 software. The measurements were conducted in an electrochemical cell with a three-electrode system consisting of a glassy carbon working electrode, an Ag/AgCl reference electrode, and a platinum wire counter electrode. Before each measurement, the system was purged with high-purity argon (φAr = 99.999%). Cyclic voltammograms showed an oxidation peak corresponding to the oxidation of the hydroxyl group of p-coumaric acid, indicating that the process is diffusion-controlled. Differential pulse voltammograms revealed that the height of the oxidation peak of p-coumaric acid changes with pH, while the optimal pH for oxidation was at the pH= 3.0. In real samples (apple juice, carrot juice, lemon juice, and pomegranate juice), p-coumaric acid was detected in the concentration range from 2 μM to 9 μM.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:165757
Study programmeTitle: University Graduate Study of Chemistry; Educational Program; specializations in: Educational Program
Course: Educational Program
Study programme type: university
Study level: graduate
Academic / professional title: sveučilišni/a magistar/magistra edukacije kemije (sveučilišni/a magistar/magistra edukacije kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2024-07-08 11:47:25