Antioxidative activities of various solvent extracts from haw (Crataegus pinnatifida Bunge)

The objective of this study was to investigate the antioxidative acitivities of various solvent extracts from haw (Crataegus pinnatifida Bunge) pulpy. The Freeze-dried pulpy of haw was extracted with five solvents (70% methanol, 70% ethanol, chloroform:methanol (CM, 2:1, v/v), n-butanol, and ethyl acetate or EA), and the DPPH, reducing power, ferric-reducing antioxidant power (FRAP), ABTS, NO, hydroxyl radical scavenging activity were then measured. The DPPH radical scavenging activity of the 70% methanol and 70% ethanol extracts were 92.89% and 91.17% in the 0.8 mg/mL concentrations, respectively, which were higher than those of the other extracts. The reducing power and FRAP decreased in the following order: 70% methanol, 70% ethanol, n-butanol, EA, and CM extracts. The ABTS radical scavenging activity was high in the 70% methanol and 70% ethanol extracts and low in the n-butanol extract. The NO radical scavenging activity was high in the 70% methanol and 70% ethanol extracts but low in the CM extracts. On the other hand, the hydroxyl radical scavenging activity was high in the n-butanol and 70% methanol extracts but low in the EA extract. These results suggest that the 70% methanol and 70% ethanol extracts from haw will be useful as natural antioxidant and biohealth foods.

산사(Crataegus pinnatifida Bunge)의 추출 용매별 항산화 활성

산사과육을70% methanol, 70% ethanol, chloroform:methanol(CM, 2:1, v/v), n-butanol, ethyl acetate(EA)로 추출하여 시료농도 0.2 mg/mL, 0.5 mg/mL, 0.8 mg/mL 농도에서 각 추출물의 항산화 활성을 비교하였다. DPPH radical 소거 활성은 70% methanol, 70% ethanol, chloroform:methanol(2:1, v/v), ethyl acetate, n-butanol 추출물 순으로 높게 측정되었고 특히 70% methanol 및 70% ethanol 추출물은 다른 추출물에 비하여 유의적으로 높은 것으로 나타났으며(p<0.05), 0.8 mg/mL 농도에서 각각 92.89%, 91.17%의 높은 활성을 나타내었다. 환원력과 ferric reducing antioxidant power(FRAP)는 동일한 경향을 나타내었는데 활성은 70% methanol, 70% ethanol, n-butanol, ethyl acetate, chloroform: methanol(2:1, v/v) 추출물 순으로 높게 나타났으며, 70% methanol 및 70% ethanol 추출물이 다른 추출물에 비하여 높은 것으로 측정되었다(p<0.05). ABTS radical 소거 활성은 DPPH와 동일한 경향이었으며 0.8 mg/mL 농도에서 70% methanol 및 70% ethanol 추출물은 각각 75.81%, 74.73%의 활성을 나타내었다. NO radical 소거 활성은 70% methanol, 70% ethanol, ethyl acetate, n-butanol, chloroform:methanol(2:1, v/v) 추출물 순으로 나타났고, hydroxyl radical 소거 활성은 n-butanol, 70% methanol, 70% ethanol, chloroform: methanol(2:1, v/v), ethyl acetate 추출물 순으로 측정되었다. Hydroxyl radical 소거 활성을 제외한 다른 실험 결과에서 70% methanol 및 70% ethanol 추출물은 다른 용매 추출물에 비하여 유의적으로 높은 것으로 나타났고 chloroform: methanol(2:1, v/v), ethyl acetate, n-butanol 추출물 간에는 대부분 유의성이 없는 것으로 측정되었다(p<0.05). 본 실험 결과 산사 과육 추출물의 항산화 활성은 우수한 것으로 나타났고 특히, 70% methanol 및 70% ethanol 추출물에서 높은 활성을 보였다. 따라서 산사는 천연 항산화제 및 기능성 식품 소재로서 활용될 수 있을 것으로 생각된다.