期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 153, 期 -, 页码 546-549出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.09.022
关键词
EPR spectroscopy; UV-vis spectroscopy; Antioxidant capacity; Fruit juices; Drinks; Nectars
类别
The differences in the Trolox Equivalent Antioxidant Capacity (TEAC) values at the same incubation time obtained by two different techniques: electron paramagnetic resonance (EPR) spectroscopy and ultraviolet visible (UV-vis) spectroscopy, which use the same antioxidant-free radical reaction mechanism, were determined for fruit juices, nectars and drinks. For this study, the stable free radical 1,1-Dipheny1-2-picryl-hydrazyl (DPPIT) was used. The antioxidant capacity was presented in Trolox Equivalents, e.g., mu M trolox per 100 ml of sample. All of the studied fruit juices, drinks and nectars showed antioxidative properties. Dependencies between TEAC values and the percent fruit content and sample color were observed for the studied beverages. It was found that EPR spectroscopy is the more adequate method for determining TEAC values for these kinds of samples. (C) 2015 Elsevier B.V. All rights reserved.
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