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master's thesis
Elektrokemijska detekcija vitamina C u realnim uzorcima
2020. urn:nbn:hr:182:128518
Blažević, Jelena
Josip Juraj Strossmayer University of Osijek
Department of Chemistry

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Blažević, J. (2020). Elektrokemijska detekcija vitamina C u realnim uzorcima (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:128518

Blažević, Jelena. "Elektrokemijska detekcija vitamina C u realnim uzorcima." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2020. https://urn.nsk.hr/urn:nbn:hr:182:128518

Blažević, Jelena. "Elektrokemijska detekcija vitamina C u realnim uzorcima." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2020. https://urn.nsk.hr/urn:nbn:hr:182:128518

Blažević, J. (2020). 'Elektrokemijska detekcija vitamina C u realnim uzorcima', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 26 October 2024, https://urn.nsk.hr/urn:nbn:hr:182:128518

Blažević J. Elektrokemijska detekcija vitamina C u realnim uzorcima [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2020 [cited 2024 October 26] Available at: https://urn.nsk.hr/urn:nbn:hr:182:128518

J. Blažević, "Elektrokemijska detekcija vitamina C u realnim uzorcima", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:182:128518

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Metadata
TitleElektrokemijska detekcija vitamina C u realnim uzorcima
Title (english)Electrochemical detection of vitamin C in real samples
AuthorJelena Blažević
MentorMartina Medvidović-Kosanović (mentor)
Committee memberElvira Kovač-Andrić (predsjednik povjerenstva)
Committee memberMartina Medvidović-Kosanović (član povjerenstva)
Committee memberMartina Šrajer Gajdošik (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
Osijek
Defense date and country2020-09-21, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Elektrokemijska svojstva vitamina C (poznatoga i kao L-askorbinska kiselina) ispitivana su cikličkom i diferencijalnom pulsnom voltametrijom u modelnim sustavima, kako bi se razvila jednostavna i prihvatljiva metoda kojom bi se detektirao vitamin C u realnim uzorcima. Rezultati su pokazali da je oksidacija vitamina C kvazi-reverzibilni i difuzijski kontrolirani proces. Utvrđeno je i da se produkt oksidacije askorbinske kiseline, dehidroaskorbinska kiselina, adsorbira na površinu elektrode od staklastog ugljika. Konstruirana je kalibracijska krivulja i linearni odgovor je dobiven u rasponu koncentracija od 2,5 mmol/dm3 do 1000 mmol/dm3. Vitamin C je uspješno određen u realnim uzorcima (voćnim sokovima i dodacima prehrani) s cikličkom voltametrijom u rasponu koncentracija od 33,9 mmol/dm3 do 367,1 mmol/dm3. Određena je i antioksidativna aktivnost vitamina C u realnim uzorcima koristeći DPPH metodu te je dobivena dobra linearna korelacija između rezultata cikličke voltametrije i rezultata dobivenih DPPH metodom za ispitivane uzorke.
Abstract (english)
Electrochemical properties of vitamin C (also known as L-ascorbic acid) have been studied by cyclic and differential pulse voltammetry in the model systems in order to develop simple and suitable method for vitamin C detection in real samples. The results indicated that vitamin C oxidation is a quasi-reversible and diffusion-controlled process. It was also determined that the oxidation product of ascorbic acid, dehydroascorbic acid, is adsorbed on the glassy carbon electrode surface. Calibration curve was constructed, and the linear response was obtained in a concentration range from 2.5 mmol/dm3 to 1000 mmol/dm3. Vitamin C was successfully determined in real samples (fruit juices and food supplement) with cyclic voltammetry within concentration range from 33.9 mmol/dm3 to 367.1 mmol/dm3. In addition, antioxidant activity of vitamin C in real samples was determined using DPPH assay, with a good linear correlation obtained between the cyclic voltammetry results and the results evaluated by DPPH assay of the investigated samples.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:128518
Study programmeTitle: Graduate University Study of Chemistry; research direction
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-11-03 09:56:47