Abstract
Potatoes were first introduced outside the Andes region four centuries ago, and have become an integral part of much of the world's food. Potatoes were first introduced into Europe in the 16th century and Korea in the early 19th century. In the nutritional aspects, potatoes contain abundant vitamins and minerals, as well as an assortment of phytochemicals such as carotenoids and natural phenols. Chlorogenic acid constitutes up to 90% of potato natural phenols. Due to the high content of potato functional compounds, it has known that potatoes are effective in the prevention of various human diseases. Recently, color-fleshed potatoes 'Hongyoung' and 'Jayoung' were developed by RDA, and it has reported that they have high content of anthocyanin. Additionally they show higher radical scavenging activity compared to white or yellow fleshed potatoes. So it will be expected that the consumption of color-fleshed potatoes grandually increase by pre-peeled potatoes and color potato chips. This study was conducted to enhance the peel of color-fleshed potatoes utilization and to determine the biological activity of peel of color-fleshed potatoes extract. The anti-inflammatory effects on ethanol extract and its solvent fraction were also evaluated. The anti-inflammatory activities of $CHCl_3$ fraction was evaluated for inhibitory activities against lipopolysacchride(LPS) induced nitric oxide(NO) and prostaglandin $E_2(PGE_2)$ production as well as inducible nitric oxide synthase(iNOS) and cyclo oxygenase-2(COX-2) protein expressions in RAW264.7 cell lines. The fraction inhibitory activity for both tests with $IC_{50}$ values showed in the ranges of $25{\sim}50{\mu}g/ml$. This result revealed that $CHCl_3$ fraction of Jayoung's peel is expected to be good candidate for development into source of anti-inflammatory agent.
본 연구센터에서는 백색과 황색의 기존 품종의 감자보다 anthocyanin함량이 높고 생리활성이 우수한 것으로 확인된 신품종인 컬러감자 '홍영'과 '자영'을 개발하였으며, 차후 컬러감자를 산업화 용도로 가공 시 전량 폐기되는 외피의 활용도를 높이기 위하여 다음과 같은 생리활성 연구를 실시하였다. 컬러감자외피의 추출물과 분획물을 이용하여 항염증 효과를 검토한 결과, 대식세포인 RAW264.7 cell에서 염증매개물질인 lipopoly sacchride(LPS)로 염증을 유발시켜 nitric oxide(NO), prostagland-in $E_2(PGE_2)$ inducible nitric oxide synthase(iNOS), 그리고 cyclo oxygenase-2(COX-2)같은 염증유발인자들의 억제효과를 확인하였다. 자색감자인 자영외피 Chloroform분획물의 염증유발인자 억제 시 $IC_{50}$ value를 측정하여 $25{\sim}50{\mu}g/ml$의 농도에서 유의성 있는 항염증 효과를 보였다. Nitric oxide 생성을 농도의존적으로 현저하게 저해하는 농도는 $36.15{\mu}g/ml$이며, 세포독성이 없는 최고 농도인 $100{\mu}g/ml$의 농도에서 LPS에 의해 유도된 $PGE_2$를 76.68%만큼 유의성 있는 저해 효과를 보였다. 그리고 iNOS와 COX-2단백질을 유의성 있게 저해하는 농도는 $50{\mu}g/ml$ 처리였으며, 특이적으로 iNOS는 $25{\mu}g/ml$을 처리하였을 때부터 유의성 있는 저해효과를 보였다. 따라서 본 연구 결과는 자영외피의 chloroform 분획물이 유의성 있는 항염증 효과를 나타내며, 이러한 효능은 예방의학적 기능성을 충분이 가지고 있기에 염증성질환의 예방을 위한 건강기능성식품의 개발가능성을 제시할 수 있을 것으로 사료된다.
