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http://dx.doi.org/10.3746/jkfn.2015.44.8.1206

Correlation between Antioxidant Capacities and Color Values in Korean Red Grape Juices  

Kim, Joo-Young (School of Food Science and Biotechnology, Kyungpook National University)
Seong, Gi-Un (School of Food Science and Biotechnology, Kyungpook National University)
Hwang, In-Wook (Food and Bio-industry Research Institute, Kyungpook National University)
Chung, Shin-Kyo (School of Food Science and Biotechnology, Kyungpook National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.44, no.8, 2015 , pp. 1206-1211 More about this Journal
Abstract
Grape juice is consumed worldwide and studied due to the high antioxidant activities and contents. The color of grape juice is due to the presence of phenolic compounds such as anthocyanins. Therefore, color values can be an indicator of antioxidant capacities of grape juice. However, the correlation between color values and antioxidant activities in grape juice has not been well studied. In this study, the physicochemical characteristics and correlation between color values and antioxidant capacities of Korean red grape juices (five commercial juices from market and two juices prepared in the laboratory) were investigated to estimate antioxidant capacities. Antioxidant capacities were determined by 1,1-diphenlyl-2-picrylhydrazyl radical scavenging assay, ferric ion reducing antioxidant power assay, and oxygen radical absorbance capacity assay. Total phenolic contents, total flavonoid contents, and total anthocyanin contents, including five kinds of polyphenolic compounds, were examined by high performance liquid chromatography (HPLC). The results for physicochemical properties showed similar values, except titratable acidity. The color hue values of the prepared juices were higher than those of commercial juices, which was in contrast to the lower color intensity values (P<0.05). The Hunter L, a, and b values showed almost no difference between commercial and prepared juices. The antioxidant activities and total phenolic contents of commercial juices were higher than those of prepared ones. Gallic acid, catechin, and quercetin were confirmed by HPLC in all samples. The total phenolic and total flavonoid contents showed positive correlation with antioxidant activities. In addition, antioxidant activities and contents correlated with color values. Thus, estimation of antioxidant capacity could be feasible through the spectrophotometric measurement of color values.
Keywords
Korean grape juice; antioxidant; quercetin; correlation; color intensity;
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