이상일
(Dept. of Food, Nutrition and Cookery, Keimyung College)
이예경
(Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
김순동
(Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
성금화
(Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
양승환
(Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
서주원
(Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
Aspergillus oryzae로 발효시킨 청미래덩굴잎 용매추출분획물의 xanthine oxidase (XO) 및 aldehyde oxidase (AO) 저해활성과 항고요산혈증에 미치는 영향을 조사하였다. 용매별 추출수율(g/kg)은 80% ethanol (EtOH)은 13.56이었으며, n-hexane, dichloromethane (DICM), ethylacetate (EtOAc) 및 n-butanol fraction (BuOH)은 1.35-3.33 범위였다. Total polyphenol 함량(mg/g-extract)은 EtOAc fraction 478.07-501.26, BuOH fraction 259.49-289.02, DICM fraction 165.03-232.27, EtOH fraction 134.02-196.54이었으며 EtOAc 및 DICM fraction에서는 발효시킨 경우가 비발효에 비하여 각각 4.85 및 40.74%가 높았으나 그 외 모든 fraction에서는 발효시킨 경우가 낮았다. 총 flavonoid 함량은 EtOAc fraction이 여타 fraction에 비하여 높았다. EtOAc 및 BuOH fraction의 TF 함량은 발효시킨 경우가 비 발효에 비하여 각각 10.56% 및 60.17%가 높았으나 여타 fraction들에서는 발효시킨 경우가 낮았다. XO 저해활성은 모든 분획물에서 발효시킨 경우가 비발효에 비하여 현저하게 높았으며 EtOAc 및 BuOH fraction의 경우 발효시킨 경우는 각각 75.02 및 65.59%로 비발효 경우 39.42 및 5.34% 보다 현저하게 높았다. AO 저해활성은 DICM과 EtOAc fraction에서 각각 81.82 및 77.93%로 여타 fraction들에 비하여 높았으며 XO의 경우와 마찬가지로 발효시킨 경우가 비발효에 비하여 현저하게 높았다. 고요산혈증 mouse의 혈중 요산(SU) 함량에 미치는 영향을 조사한 결과, 고요산혈증 대조군의 SU 함량은 6.98 mg/dL로 정상대조군 (NC)의 3.82 mg/dL에 비하여 1.83배가 높았으나, EtOAc fraction은 투여량에 의존적으로 SU의 함량이 감소하였으며, 발효시킨 경우가 비발효에 비하여 유의적인 감소를 보였다. 이상의 결과, A. oryzae와 청미래덩굴잎의 발효과정을 통해, glycoside형태의 flavonoid를 aglycone화하여 비발효에 비해 높은 XO 및 AO 저해활성과 함께 항고요산혈증 효과를 나타내는 것으로 사료된다.
To evaluate the inhibitory effect of xanthine oxidase (XO) and aldehyde oxidase (AO), and antihyperuricemic effect by Aspergillus oryzae fermented Smilax china L. leaf extracts and fractions, we observed extracted yield by each solvent, the content of total polyphenol and total flavonoid (TF), the activities of XO and AO, and serum uric acid level. Extracted yield (g/kg) by 80% ethanol (EtOH) was 13.56, those of n-hexane, dichloromethane (DICM), ethylacetate (EtOAc) and n-butanol fraction (BuOH) were 1.35-3.33. Furthermore, total polyphenol content (mg/g-extract) of EtOAc fraction, BuOH fraction, DICM fraction and EtOH fraction is 478.07-501.26, 259.49-289.02, 165.03-232.27, 134.02-196.54, respectively. Those of fermented EtOAc and DICM fraction was 4.85 and 40.74% higher than that of non-fermented fraction, respectively, while the other fermented fractions were lower than those of non-fermented fractions. And total flavonoid content (mg/g-extract) of EtOAc fraction was higher than those of other fractions. Additionally, TF of fermented EtOAc and BuOH fraction is 10.56 and 60.17% higher, than that of fermented fraction, respectively, although those of the other fermented fractions was lower than that of non-fermented fractions. On the other hand, XO inhibitory activities of all fermented fractions was significantly higher than that of all non-fermented fraction, while those of fermented EtOAc (75.02%) and BuOH fraction (65.59%) was markedly higher than that of non-fermented fraction (39.42 and 5.34%), respectively. In addition, AO inhibitory activities of DICM and EtOAc fraction was 81.82 and 77.93% higher, respectively, than those of the other fractions, and those of fermented fractions as with XO were significantly higher than that of non-fermented fractions. Meanwhile, serum uric acid level (SU) of hyperuricemic control mice (HC, 6.98 mg/dL) was 1.83 folds higher than that of normal control (NC, 3.82 mg/dL). Furthermore, SU in the group treated with EtOAc fraction decreased in a dose dependent manner compared with the allopurinol control group, although those of fermented fractions were significantly lower than those of non-fermented fractions. This study suggests that fermented Smilax china L. leaf extracts may regulate the XO and AO inhibitory activities and antihyperuricemic effect due to aglycone components from glycoside form flavonoids by fermentation of A. oryzae.