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Total phenol content and antioxidant activity of water solutions of plant extracts

Mirela Kopjar ; University of Josip Juraj Strossmayer in Osijek, Faculty of Food Technology Osijek, Osijek, Croatia
Vlasta Piližota ; University of Josip Juraj Strossmayer in Osijek, Faculty of Food Technology Osijek, Osijek, Croatia
J. Hribar ; University of Ljubljana, Biotechnical Faculty, Ljubljana, Slovenia
M. Simčić ; University of Ljubljana, Biotechnical Faculty, Ljubljana, Slovenia

Puni tekst: engleski, pdf (132 KB) str. 1-7 preuzimanja: 3.185* citiraj
APA 6th Edition
Kopjar, M., Piližota, V., Hribar, J. i Simčić, M. (2009). Total phenol content and antioxidant activity of water solutions of plant extracts. Croatian journal of food science and technology, 1 (1), 1-7. Preuzeto s https://hrcak.srce.hr/53238
MLA 8th Edition
Kopjar, Mirela, et al. "Total phenol content and antioxidant activity of water solutions of plant extracts." Croatian journal of food science and technology, vol. 1, br. 1, 2009, str. 1-7. https://hrcak.srce.hr/53238. Citirano 18.09.2019.
Chicago 17th Edition
Kopjar, Mirela, Vlasta Piližota, J. Hribar i M. Simčić. "Total phenol content and antioxidant activity of water solutions of plant extracts." Croatian journal of food science and technology 1, br. 1 (2009): 1-7. https://hrcak.srce.hr/53238
Harvard
Kopjar, M., et al. (2009). 'Total phenol content and antioxidant activity of water solutions of plant extracts', Croatian journal of food science and technology, 1(1), str. 1-7. Preuzeto s: https://hrcak.srce.hr/53238 (Datum pristupa: 18.09.2019.)
Vancouver
Kopjar M, Piližota V, Hribar J, Simčić M. Total phenol content and antioxidant activity of water solutions of plant extracts. Croatian journal of food science and technology [Internet]. 2009 [pristupljeno 18.09.2019.];1(1):1-7. Dostupno na: https://hrcak.srce.hr/53238
IEEE
M. Kopjar, V. Piližota, J. Hribar i M. Simčić, "Total phenol content and antioxidant activity of water solutions of plant extracts", Croatian journal of food science and technology, vol.1, br. 1, str. 1-7, 2009. [Online]. Dostupno na: https://hrcak.srce.hr/53238. [Citirano: 18.09.2019.]

Sažetak
Water solutions of extracts were investigated for total phenol content, flavonoid content and antioxidant activity. Susceptibility to degradation of water solutions of plant extracts, under light and in the dark, during storage at room temperature was investigated in order to determine their stability prior to their application for fortification of food products. Large dispersion of total phenol (TP) content in the investigated model solutions of selected extracts (olive leaves, green tea, red grape, red wine, pine bark PE 5:1, pine bark PE 95 %, resveratrol), ranging from 11.10 mg GAE/100 mL to 92.19 mg GAE/100 mL was observed. Consequently, large dispersion of total flavonoids (TF) content (8.89 mg to 61.75 mg CTE/100 mL) was also observed. Since phenols have been mostly responsible for antioxidant activity of extracts, in most cases, antioxidant activity followed the TP content. That was proven by estimation of correlation coefficient between the total phenol content and antioxidant activity. Correlation coefficients between investigated parameters ranged from 0.5749 to 0.9604. During storage of 5 weeks at room temperature loss of phenols and flavonoids occurred. Antioxidant activity decreased with the decrease of TP and TF content. Degradations of phenols and flavonoids were more pronounced in samples stored at light.

Ključne riječi
polyphenols; flavonoids; extracts solutions; antioxidant activity; storage

Hrčak ID: 53238

URI
https://hrcak.srce.hr/53238

Posjeta: 3.483 *