几种香茶菜属二萜类化合物的抗氧化作用

目的　了解香茶菜属二萜类化合物冬凌草乙素(Pon)、香茶菜醛 (Ame)、毛叶香茶菜醇 (Iso)是否具有抗氧化作用。方法　用分光光度法测定Fenton反应体系中细胞色素C(Ⅱ )的含量 ,了解清除·OH的能力 ;用紫外分光光度法测定N-2 的含量 ,了解清除O-·2 的能力 ,用DTNB法测定GSH的含量。结果　Orid、Pon、Ame、Iso ,5 0、10 0、2 0 0 μmol·L-1可清除H2 O2 Fe2 + 反应体系中产生的·OH ,且呈剂量依赖关系。Orid、Pon、Ame、Iso ,4 0 0、80 0 μmol·L-1可清除黄嘌呤 -黄嘌呤氧化酶系统产生的NO-2 。Orid、Pon、Ame、Iso ,1、2 μmol·L-1可明显的减少LPS刺激巨噬细胞产生的NO-2 。Orid、Pon、Ame、Iso ,2、4 μmol·L-1可明显抑制CCl4造成的GSH含量降低 ,具有剂量依赖性。结论　Orid、Pon、Ame、Iso能有效地清除羟自由基和一氧化氮 ,抑制脂质过氧化而产生抗氧化作用

Studies on the antioxidant effect of diterpenoid compounds

AIM To study the scavenging free radicals and antioxidant effect of diterpenoid compounds. METHODS Reductive cytochrome C (cytc Ⅱ) in fenton reaction system was detected by spectrophotometer to indicate the scavenging capability of the test compounds scavenging. The NO - 2 content was measured by spectrophotometery. DNTB method was used to measure the content of GSH. RESULTS oridonin (Orid), ponicidin (Pon), amethystonal(Ame), Isodonoiol(Iso) 50,100,200 μmol·L -1 could scavenge hydroxyl radicals(·OH) in Fenten's reaction. Orid, Pon, Ame, Iso 400, 800 μmol·L -1 could scavenge superoxide anion(O -· 2) in xanthine/xanthine oxidase system. Orid, Pon, Ame, Iso 2,4 μmol·L -1 decreased the content of NO - 2, in macrophages stimulated by LPS and also inhibited the decrease of GSH content in liver cell caused by CCl 4. CONCLUSION Orid, Pon, Ame, Iso all have antioxidative effect through scavenging ·OH, NO - 2 and inhibiting lipid peroxidation.