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http://dx.doi.org/10.11623/frj.2018.26.4.05

Determination of Antioxidant Activity of Edible Calendula Flowers by Hot-air Drying Time  

Oh, Sang Im (Department of Environmental Horticulture, Dankook University)
Kim, Seo Young (Department of Environmental Horticulture, Dankook University)
Lee, Ja Hee (Department of Environmental Horticulture, Dankook University)
Lee, Ae Kyung (Department of Environmental Horticulture, Dankook University)
Publication Information
FLOWER RESEARCH JOURNAL / v.26, no.4, 2018 , pp. 202-208 More about this Journal
Abstract
This experiment was conducted to determine optimal hot-air drying time for producing antioxidative calendula tea. The edible calendula was dried in hot air at $60^{\circ}C$ for 5, 10, 15 hours and Hunter's color value was measured and extracted with 95% ethanol as a solvent. The contents of total polyphenol, total flavonoid, total carotenoid and DPPH (2,2 Dipheny-1-picrylhydrazyl) radical scavenging activity were investigated. The correlation between the amount of antioxidant and antioxidant activity was analyzed. As the treatment time increased, the Hunter values of L, a, and b tended to decrease, and the L value and b value decreased significantly at 15 hours. The color change was occurred in all treatments compared with the control, and the total color difference (${\Delta}E$) was the largest at 15 hours treatment. The contents of total flavonoids, total carotenoids and DPPH scavenging activity increased in the 5 hours, but decreased in the 15 hours compared to the 10 hours. The content of total polyphenol was not changed with different treatment time. A positive correlation ($p{\leq}0.01$, r = 0.610) between carotenoids and DPPH radical scavenging activity was demonstrated. The DPPH radical scavenging activity was increased at 5 and 10 hours compared to the control and decreased at 15 hours. Therefore, 5 hours or 10 hours of treatment is appropriate and further studies are needed to determine the specific treatment time.
Keywords
Calendula officinailis; carotenoid; DPPH radical scavenging activity; flavonoid; herbal tea;
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