본 연구는 탱자(Poncirus trifoliata) 과피의 80% 에탄올 추출물(PTP)에 대한 항산화 활성과 면역 활성을 유자(Citrus junos) 과피 추출물(CJP)과 비교하였다. 총 phenol 함량과 총 flavonoids 함량은 PTP가 각각 $60.75{pm}1.15$ mg/100 g과 $33.75{pm}0.15$ mg/100 g이었으며, 이는 CJP에 비해 다소 낮았다. PTP의 항산화 활성은 농도 의존적으로 증가하였으며 CJP의 항산화 활성과 비슷하게 나타났다. 면역반응 중 대식 세포가 생성하는 NO 생성량을 측정한 결과 CJP와 PTP를 단독으로 처리한 경우와 LPS와 혼합하여 처리한 경우 모두 1 mg/ml까지는 대조구와 비교하여 농도 의존적으로 증가하였으나 고농도에서는 감소하는 경향을 나타내었다. 비장세포를 이용한 면역세포 증식능에서 CJP와 PTP를 첨가한 경우, 1 mg/ml까지는 대조구와 비교하여 농도 의존적으로 증가하였으나 고농도에서는 감소하였다.
In this study, we compared with 80% ethanol extracts from peel of Poncirus trifoliata (PTP) and peel of Citrus junos (CJP) against antioxidant and immune activities. Total phenolics and flavonoids contents in PTP extracts were $60.75{pm}1.15$ and $33.75{pm}0.15$ mg/l00 g, respectively, and those were lower than CJP extracts. Antioxidant activities of PTP were increased with the more concentration, and were similar to CJP. Antioxidant activities of PTP were increased with increasing of concentration, and were similar to those of CJP. The NO production in macrophage cell lines were increased in a dose-dependent manner, until 5 mg/ml of CJP and 1 mg/ml of PTP compared with control cells, but decreased at higher concentrations. The proliferation of mouse spleen cells were increased in a dose-dependent manner, until 1 mg/ml of CJP and PTP compared with control cells but decreased at higher concentrations. The NO production in macrophage cell lines treated with PTP and CJP were increased in a dose-dependent manner, compared with untreated control cells until the concentrations of $1{sim}5$ mg/ml (CJP) and 1 mg/ml (PTP) but decreased at higher concentrations than that. The proliferation of mouse spleen cells treated with PTP and CJP were increased in a dose-dependent manner, compared with untreated control cells until the concentration of 1 mg/ml but decreased at higher concentrations than that.
