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http://dx.doi.org/10.11002/kjfp.2014.21.2.199

Quality characteristics and antioxidant activity of black Doraji-apple juice mixed with jujube extracts  

Kim, Ja-Min (Department of Food and Nutrition, Yeungnam University)
Moon, Yong-Sun (Department of Horticulture, Yeungnam University)
Yoon, Kyung-Young (Department of Food and Nutrition, Yeungnam University)
Publication Information
Food Science and Preservation / v.21, no.2, 2014 , pp. 199-205 More about this Journal
Abstract
This study was conducted to investigate the physicochemical properties and antioxidant activity of black Doragi-apple juice to increase the utilization of Doragi, which is known as a high-functional horticultural crop. To prepare the black Doragi, it was steamed for 15 days at $60^{\circ}C$ and was then dried at $30^{\circ}C$ for 3 h. The five types of black Doragi-apple juice were prepared based on different mixing ratios of black Doraji extract, apple extract, and jujube extract. The mixing ratios of black Doraji extract, apple extract, and jujube extract were 3:3:1, 4:2:1, 2:4:1, 2:2:1, and 2:6:1 for samples A, B, C, D, and E, respectively. The pH and acidity of black Doragi-apple juice were within the ranges of 3.9-4.15 and 1.26-1.51%, respectively. Black Doraji-apple juice E showed the highest sugar content (9.33 $^{\circ}Brix$), reducing sugar content (85.05 mg/mL), and sugar content/acid ratio (6.98). Based on the sensory evaluation, sample C was most preferable in terms of color, taste, sugar-acid ratio, and overall preference, except for the flavor. Black Doragi-apple juice D showed a higher total polyphenol content (706 ${\mu}g/mL$) than sample C (586.22 ${\mu}g/mL$), but there was no statistically significant difference between samples C and D in terms of antioxidant activities. Therefore, it is suggested that the best mixing ratio of black Doraji extract, apple extract, and jujube extract for the production of the best black Doragi-apple juice with excellent taste and antioxidant activities is 2:4:1 (sample C).
Keywords
Platycodon grandiflorum; apple; jujube; mixing ratio; antioxidant activity;
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Times Cited By KSCI : 14  (Citation Analysis)
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