摘要
目的:比较16味中药炮制前后的抗氧化活性。方法:采用氧自由基清除能力(ORAC)法测定样品的抗氧化活性。荧光素(FL)为荧光探针。2,2-偶氮-2-氨基氢氯化丙烷在37℃时以稳定的速率产生过氧化氢(H2O2),H2O2氧化FL从而造成其荧光衰减。抗氧化剂的存在可以清除H2O2,延迟FL的荧光衰减,动态记录样品35min内的荧光变化。以水溶性维生素E为标准品绘制标准方程,根据Trolox标准方程计算样品的ORAC值。表儿茶素为阳性对照。结果:16味中药炮制前、后均具有一定的ORAC值,酒黄芩的ORAC值最高,为4241μmol TE·g-1;炒薏苡仁的ORAC值最低,为17μmol TE·g-1。10味中药炮制品的ORAC值低于生品,其中7味有显著性差异(P<0.05);6味炮制品的ORAC值高于生品,其中3味有显著性差异(P<0.05)。结论:16味中药炮制前、后抗氧化活性的变化可能与其所含的化学成分含量改变有关。
OBJECTIVE: To investigate the antioxidant activity of 16 ingredients of traditional Chinese medicine (TCM) and their processed products. METHODS: Antioxidant capacity of samples was measured by the Oxygen Radical Absorbance Capacity (ORAC) with fluorescein (FL) as fluorescent probe. Hydrogen peroxide (H2O2) was induced by 2’-Azobis(2-amidinopropane) dihydrochloride(AAPH) at 37 ℃ and stable velocity. Oxidation of FL which was induced by H2O2 resulted in fluorescence decay of FL. Anti-oxidant could scavenge H2O2 and delay the fluorescence decay of FL. The fluorescence change of samples was recorded within 35 min. Standard equation was established using water-soluble vitamin E (Trolox) as standard to calculate ORAC value of samples with epicatichin as positive control. RESULTS: 16 ingredients of TCM and their processed products all showed ORAC values. ORAC value of processed Scutellaria baicalensis was 4 241 μmol TE·g-1 and the highest value among 16 ingredients of TCM while processed Coix lacryma-jobi was 17 μmol TE·g-1 and the lowest value among them. ORAC value of 10 ingredients of raw TCM was higher than processed ones, there was significant difference among 7 ingredients of TCM(P〈0.05). ORAC value of 6 ingredients of processed TCM was higher than raw TCM, there was significant difference among 3 ingredients of TCM(P〈0.05). CONCLUSION: The difference of antioxidant activity of 16 ingredients of TCM and their processed products may be related to change of chemical components.
出处
《中国药房》
CAS
CSCD
北大核心
2010年第47期4436-4438,共3页
China Pharmacy
关键词
中药
炮制品
抗氧化活性
氧自由基清除能力
Traditional Chinese medicine
Processed product
Antioxidant activity
ORAC