Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Antimicrobial Activities, Antioxidant Effects, and Total Polyphenol Contents of Extracts of Prickly Pear, Opuntia ficus indica

신안산 손바닥선인장의 생리활성 검정

  • Published : 2009.12.30
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Abstract

The antimicrobial activities, antioxidant effects, and total polyphenol contents of extracts of Prickly Pear Opuntia ficus indica, were investigated. In antimicrobial activity assays of solvent extract fractions, methanol and butanol extracts showed higher activities than did hexane and ether extracts. The stem showed a higher antimicrobial activity than did the fruit. When the antimicrobial activities of fruit and stem extracts was tested using 10 bacterial strains, strong activity was evident against Escherichia coli, with a lowest minimum inhibitory concentration of 100 mg/disk. However, no antimicrobial activities against lactic bacteria or yeasts were evident, even with disks containing more than 500 mg extract/disk. Antimicrobial substances in butanol extracts of fruit and stem maintained activity after heating at $100^{\circ}C$ for 30 min and were not affected by changes in pH. DPPH free radical-scavenging activities of solvent extracts were in the order of water, ethyl acetate, butanol, ether, and ethanol. The stem showed greater DPPH free radical-scavenging activity than did the fruit. The total polyphenol contents in fruit and stem were 520.57 and 203.26 mg%, respectively.

신안산 손바닥선인장 butanol 추출물과 methanol 추출물이 10균주 중 세균에 대하여 항균활성이 강하였으나, 젖산균 및 효모에 대해서는 항균활성이 나타나지 않았다. 부위별 항균활성은 줄기 추출물이 열매 추출물 보다 강한 활성을 나타내었다. 손바닥선인장의 butanol 추출물의 최소저해 농도는 세균은 100 mg/mL 이었고, 효모와 젖산균은 500 mg/mL이었다. 손바닥선인장 추출물의 열 안정성은 $100^{\circ}C$에서 30분 가열시에도 항균활성이 거의 감소되지 않아 열에 안정한 물질로 확인 되었다. 손바닥선인장 butanol 추출물에 함유된 항균활성 물질의 pH 안정성은 산성인 pH 3과 알칼리인 pH 9 에서도 항균활성이 감소되지 않아 산과 알칼리에서도 안정한 물질로 확인되었다. 손바닥선인장의 추출물별 DPPH free radical scavenging activity는 열매와 줄기 모두 water, methanol, butanol, ethyl-acetate 및 diethylether 순으로 나타냈고, 시료 부위별로는 줄기가 열매에 비해 항산화성 활성이 높게 나타냈다. 손바닥선인장의 폴리페놀함량은 열매가 520.57 mg%로 줄기 203.26 mg% 보다 2배정도 높은 함량을 나타내었다.

Keywords

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