본 연구는 구기엽(Lycium chinesis Miller Lycii folium)의 항산화 활성이 높은 최적추출 용매를 설정하고자 100% MeOH, 80% MeOH, 80% EtOH 및 water로 혼합 용매를 제조하여 구기엽 추출물을 제조하였다. 각 추출물의 총 페놀 화합물은 80% MeOH 1.420 mg/mL> 80% EtOH 1.382 mg/mL> 100% MeOH 1.085 mg/mL> water 1.084 mg/mL 순으로 나타났고, 전자공여능 및 SOD 유사활성에서도 80% MeOH 추출물에서 83.85%, 88.46%로 가장 높은 활성을 나타내었으며, water 추출물에서 54.65%, 67.47%로 가장 낮은 활성을 나타내었다. Hydroxyl radical 소거능에서는 80% MeOH 추출물에서 73.58%로 가장 높았고, 100% MeOH 추출물에서 66.65%로 가장 낮은 활성이었다. Hydrogen radical 소거능 또한 80% MeOH에서 35.40%로 가장 높은 활성을 보였고, 100% MeOH 추출물에서 11.70%로 가장 낮은 활성을 나타내었다. 본 실험 결과 아직 초기 단계에 불과하지만 구기엽의 항산화 활성 검토에서 80% MeOH 추출물에서 가장 높은 활성을 보여 구기엽 추출물의 기능성 소재로 개발 가능성이 시사되었다.
The aim of this study was to analyze the antioxidant properties of Lycii folium extracts prepared from different solvents. Lycii folium were extracted with water, 80% ethanol (80% EtOH), 80% methanol (80% MeOH) and 100% methanol (100% MeOH) in water bath at $40^{circ}C$. The antioxidant activity of the extracts was evaluated using DPPH, hydroxyl and hydrogen radical scavenging activities, and SOD-liked activity. Total phenolic acid contents were 1.085 mg/mL in 100% MeOH, 1.382 mg/mL in 80% EtOH, 1.420 mg/mL in 80% MeOH and 1.084 mg/mL in water. DPPH radical scavenging activity of the extracts were 65.60% in 80% EtOH, 56.80% in 80% MeOH, 83.85% in 100% MeOH and 54.65% in water. Hydroxyl radical scavenging activities were 66.65% in 100% MeOH, 73.13% in 80% ethanol, 73.58% in 80% MeOH and 70.73% in water. Hydrogen radical scavenging activity of the extracts prepared from Lycii folium were 11.70% in 100% MeOH, 33.73% in 80% EtOH, 35.40% in 80% M eOH and 23.86% in water. SOD-liked activity of the extracts prepared from Lycii folium was 71.58% in 100% MeOH, 74.29% in 80% EtOH, 88.46% in 80% MeOH and 67.47% in water. Our result showed that Lycii folium extracts prepared from 80% methanol were found to be promising biomaterials with antioxidant effects.
