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Changes of Antioxidant Activity in Juglans mandshrica Maxim. Leaves by Far Infrared Ray Irradiation  

Eom, Seok-Hyun (Plant Biotechnology, School of Bioscience & Biotechnology, Kangwon Natl. Univ.)
Park, Hyoung-Jae (Plant Biotechnology, School of Bioscience & Biotechnology, Kangwon Natl. Univ.)
Jin, Cheng-Wu (Plant Biotechnology, School of Bioscience & Biotechnology, Kangwon Natl. Univ.)
Park, Seung-Moon (Research Center of Bioactive Materials, Chonbok National University)
Kim, Myong-Jo (Bioberb Research Institute of Kangwon Natl. Univ.)
Yu, Chang-Yeon (Bioberb Research Institute of Kangwon Natl. Univ.)
Cho, Dong-Ha (Plant Biotechnology, School of Bioscience & Biotechnology, Kangwon Natl. Univ.)
Publication Information
Korean Journal of Medicinal Crop Science / v.15, no.4, 2007 , pp. 266-270 More about this Journal
Abstract
This research was conducted to investigate antioxidant activities of Juglans mandshrica forages by the irradiation of far infrared ray during leaf drying processes before compound extraction, with its potential use for activating antioxidants. The contents of total phenolics and flavonoids in the basis of a gram leaf dry weight were maximized in 20 min at 30 V of far infrared irradiation. Total phenolic content was 25.43 mg/g in the FIR treatment, while it was 21.12 mg/g in the non-FIR treatment control. Total flavonoid content was 39.38 mg/g in the FIR treatment, while it was 32.78 mg/g in the non-FIR treatment control. The contents were decreased when the condition of far infrared ray irradiation was higher voltage and longer treatment time, exhibiting 16.93 mg/g of total phenolics and 23.78 mg/g of total flavonoids in 30 min at 50 V of far infrared irradiation. The antioxidant activities were shown to positive relationships with the contents of total phenolics and total flavonoids. In this study, we concluded that content of bioactive molecules relating antioxidant activity in Juglans mandshrica forages is optimized in 20 min at 30 V of far infrared irradiation for leaf drying process.
Keywords
Juglans mandshrica; far infrared ray; phenolics; flavonoids; antioxidant activity;
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