The study of antioxidant capacity of varieties of nalewka, a traditional Polish fruit liqueur, using EPR, NMR and UV–vis spectroscopy

Autor:	Justyna Polak, Mariola Bartoszek
Rok vydání:	2015
Předmět:	DPPH Trolox equivalent antioxidant capacity Nuclear magnetic resonance spectroscopy law.invention chemistry.chemical_compound Ultraviolet visible spectroscopy chemistry law Polyphenol Organic chemistry Trolox Electron paramagnetic resonance Spectroscopy Food Science Nuclear chemistry
Zdroj:	Journal of Food Composition and Analysis. 40:114-119
ISSN:	0889-1575
Popis:	The antioxidant properties of various kinds of the traditional Polish alcoholic beverage nalewka were investigated using electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR) and ultraviolet–visible (UV–vis) spectroscopy. The antioxidant capacity was measured by EPR spectroscopy in μmol Trolox (TE) in a 100 mL nalewka sample. The total phenolic content was measured by Folin–Ciocalteu (FC) assays while aromatic proton content ( H ar ) was determined by NMR spectroscopy; subsequently the correlation among these values was explored. All of the investigated nalewkas exhibited antioxidant properties. The values of Trolox equivalent antioxidant capacity (TEAC DPPH ) were in the range 45–1045 μmol TE/100 mL. It was found that the value of the TEAC DPPH corresponded to the TP ( r = 0.96) and H ar ( r = 0.95). Moreover, the TEAC DPPH values depended on the kinds of fruits used for nalewkas’ preparation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9623e09806c7db0a6969e36e1b62a439 https://doi.org/10.1016/j.jfca.2015.01.006 Zobrazit plný text záznamu Full Text from ScienceDirect