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KMID : 1134820120410070914
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Journal of the Korean Society of Food Science and Nutrition
2012 Volume.41 No. 7 p.914 ~ p.920
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Effects of Heat Treatment and Extraction Method on Antioxidant Activity of Several Medicinal Plants
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Jang Gwi-Yeong
Kim Hyun-Young
Lee Sang-Hoon
Kang Yu-Ri
Hwang In-Guk
Woo Koan-Sik
Kang Tae-Soo
Lee Jun-Soo
Jeong Heon-Sang
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Abstract
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We investigated the effects of heat treatment and extraction method on the antioxidant activities of five medicinal plants: Cyperus rotundus, Eucommia ulmoides, Bupleurum falcatum, Achyranthes japonica Nakai, and Akebia quinata. Extraction was performed with only ultrasound, ultrasound after heating at 130oC for 2 hours, and reflux extraction with distilled water. The phenolic contents of reflux extraction and ultrasound extraction after heating were higher than only ultrasound extraction, and ultrasound extraction after heating samples was higher than reflux extraction except for Eucommia ulmoides and Cyperus rotundus. Total flavonoid content was higher in reflux and ultrasound extraction after heating samples than only ultrasound extraction, except for Cyperus rotundus. ABTS radical scavenging activity was higher in reflux extraction and ultrasound extraction after heating a sample, than only ultrasound extraction. DPPH radical scavenging activity was higher in reflux extraction except for Achyranthes japonica Nakai and Akebia quinata. The reducing power of ultrasound extraction after heating was higher with Achyranthes japonica Nakai. From the results of this study, we can expect to increase the antioxidant activity of medicinal plant extracts by applying suitable extraction and pretreatment conditions on the type of medicinal plant.
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KEYWORD
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medicinal plants, heat treatment, extraction methods, total polyphenol, antioxidant activity
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