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Antioxidant and antimicrobial activities of black Doraji (Platycodon grandiflorum)

흑도라지의 항산화 및 항균 활성

Lee, Soo-Jin;Bang, Woo-Suk;Hong, Ju-Yeon;Kwon, O-Jun;Shin, Seung-Ryeul;Yoon, Kyung-Young
이수진;방우석;홍주연;권오준;신승렬;윤경영

  • Received : 2013.06.05
  • Accepted : 2013.08.01
  • Published : 2013.08.30

Abstract

This study was conducted to investigate the antioxidant and antimicrobial activities of the hot-water and methanol extracts of raw and black Doraji to increase its utilization. In order to prepare the black Doraji, it was steamed for 15 days at a temperature of $60^{\circ}C$ and then it was dried at a temperature of $30^{\circ}C$ for 3 hr. The methanol extract from the black Doraji (BM) contained the highest levels of total polyphenols among the extracts, and the total polyphenol content of the extract from a black Doraji was higher than that of the extract from a raw Doraji. The total flavonoid contents of the hot-water extract from a black Doraji (BW) was the highest (7.94 mgQE/g) among the samples. The DPPH and ABTS radical scavenging activities increased according to the increase in the concentrations of the Doraji extracts. The BM has the highest radical scavenging activity among the extracts. Each extract showed a slight difference in the antibacterial activity according to the tested strains. The Black Doraji showed a higher antimicrobial activity compared to the raw Doraji. The hot-water extracts demonstrated higher activities than the methanol extracts, and the BW revealed the strongest activity. In this study, the black Doraji showed more effect of the antioxidant and anti-microbial activities than the raw Doraji. These results will provide fundamental data for improving the sitological value and the black Doraji can be used as a valuable resource for the development of nutraceutical foods.

Keywords

Platycodon grandiflorum;black Doragi;antioxidant activity;antimicrobial activity

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