目的:对有活性的茜草氯仿提取部位进行化学成分的分离筛选。方法:首次利用DPPH(1,1-d iphenyl-2-p icrylhydrazy)方法,对茜草提取部位进行抗氧化筛选。结果:从有活性的氯仿部位分离得到11个化合物,经波谱分析鉴定为Mollugin(1),Furomollugin(2),6-hydroxyrub iad in(3),A lizarin(4),6-m ethxylqu in izarin(5),1-hy-droxy-2-m ethylanthraqu inone(6),Xanthopurpurin(7),Anthragallol(8),Rub iad in(9),Ursolic ac id(10),β-sitos-terol(11)。结论:其中化合物3,4,8具有抗氧化活性,化合物10为首次从该属中分离得到。
首次采用反相高效液相色谱法测定茜草根中1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]的含量。色谱柱为Purospher star RP C18色谱柱(250mm×4.6mm,5μm),流动相为甲醇:水:四氢呋喃(65:34.7:0.3),流速为1.0mL/min,检测波长为276nm,柱温为25℃。该方法的线性范围为0.020~0.160μg,r=0.9998,平均回收率为101.5%,RSD为2.0%(n=6)。该方法测定1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]含量灵敏、准确、重现性好。
Neonauclea sessilifolia belongs to Rubiaceae and its chemical constituents and pharmacological investigations were seldom reported. To search the active constituents of the plant, the ethanol of the dried stem of Neonauclea sessilifolia was separated via reflux with ethanol, then the crude product was extracted with ethyl acetate and n-butanol in sequence. The ethyl acetate extract was further isolated by silica gel and Sephadex LH-20 column chromatography. A new triterpene was obtained, and the structure was identified as 3β, 7β, 21β, 23-tetrahydroxyolean-12-ene-28-oic acid via 1D, 2D NMR techniques and HR-EI-MS analysis.
本文用反相高效液相色谱法测定垫状卷柏药材中的穗花杉双黄酮。选用Purospher star RP-C18色谱柱（250mm×4．6mm，5μm），以甲醇-0．1％磷酸水溶液（65：35）为流动相，流速为O．8mL／min，检测波长337nm，柱温25℃进行检测。结果显示，穗花杉双黄酮的含量在0．038—0．342μg范围内时进样量与峰面积积分值呈良好的线性关系，r=0．9999，平均回收率为101．2％，RSD为2．3％（n=6）。该方法测定垫状卷柏药材中的穗花杉双黄酮含量灵敏、准确、重现性好。
