Comparative absorption kinetics of seven active ingredients of Eucommia ulmoides extracts by intestinal in situ circulatory perfusion in normal and spontaneous hypertensive rats

Eucommia ulmoides Oliv. (E. ulmoides) is a valuable and nourishing medicinal herb in China that has been used in the treatment of hypertension. Given the fact that most traditional Chinese medicine is mainly used to treat disease, investigating the pharmacokinetics of traditional Chinese medicines in the pathological state is more useful than that in the normal state. However, the differences in the absorption kinetics of active ingredients of E. ulmoides extract between pathological and physiological conditions have not been reported. Therefore, in this study, the rat intestinal in situ circulatory perfusion model was used to investigate the differences in absorption kinetics of seven active ingredients of E. ulmoides extract in normal and spontaneously hypertensive rats, namely, genipinic acid, protocatechuic acid, neochlorogenic acid, chlorogenic acid, cryptochlorogenic acid, (+)-pinoresinol di-O-β-D -glucopyranoside and (+)-pinoresinol 4′-O-β-D -glucopyranoside. Our results indicate that the pathological state of spontaneous hypertension may change the absorption of active components of E. ulmoides extracts, and these findings may provide a reference for improving the rational use of E. ulmoides in the clinic.     

杜仲氨基酸成份的研究

本文借助氨基酸自动分析仪对杜仲离体培养愈伤组织、树叶、树皮中氨基酸含量进行了系统研究，共检测出１６种氨基酸，其总含量为４１．４９～２０８．２２ｍｇ／ｇ，其中包括７种必需氨基酸。     

Rapid and high-resolution analysis of geometric polyprenol homologues by connected octadecylsilylated monolithic silica columns in high-performance liquid chromatography

A Chromolith Performance octadecylsilyl (ODS) monolithic silica column (Merck) was compared with a conventional microparticulate ODS-bonded silica column in the high-performance liquid chromatography separation of natural polyprenols. A system comprising two connected monolithic columns afforded an equivalent separation at half the analysis time of the conventional method. Furthermore, ten connected columns achieved a tremendously high-resolution separation, in which the complicated series of homologous polyprenols with geometric isomerism were fully separated.     

两种药用植物叶的营养成分和药用价值分析

本文对豆腐柴、杜仲两种药用植物叶的营养成分含量和氨基酸的组成、营养价值进行了研究评价,并对两种植物的药用价值进行了分析,为更好的开发利用这两种资源植物提供科学依据.     

两种醇沉方式对杜仲水提液中氯原酸含量的影响

对一次醇沉及多次醇沉后杜仲水提液中氯原酸的含量做了对比分析．结果表明，分次醇沉比一次醇沉所得的产品纯度高；当乙醇浓度最终为９０％时，一次醇沉的损失率为１８．９％，而分次醇沉的损失率仅为６．８％．     

当归水培苗的组织培养

以甘肃漳县当年的当归(Angelicasinensis(Oliv.)Diels)种子经萌发而得的幼嫩水培苗为材料进行组织培养研究,结果表明:最佳诱导愈伤组织的培养基是H 0 5mg/L2,4-D;产生愈伤组织的能力依次是叶柄,根尖,叶片;愈伤组织的最佳增殖培养基是MS 1 0mg/L2,4-D 0 2mg/L6-BA;水培苗的最佳壮苗、增殖培养基是MS 1 0mg/LIAA 300mg/LLH 5 0mg/L6-BA;最佳生根培养基是MS 1 0mg/LIAA 300mg/LLH.     

Anti-glycating and anti-oxidant compounds from traditionally used anti-diabetic plant Geigeria alata(DC) Oliv. & Hiern.

Abstract

A new sesquiterpene lactone geigerianoloide (1) and four known flavonoids axillarin (2), quercetin (3), 3-methoxy-5,7,3',4'-tetrahydroxy-flavone (4) and hispidulin (5) were isolated from Geigeria alata (DC) Oliv. & Hiern. (Asteraceae). Structures were deduced using ¹H- and ¹³C- NMR spectroscopy, mass spectrometry, while the structure of compound 1 was also deduced using X-ray crystallography technique.

Geigeria alata is traditionally used for diabetes, therefore compounds were tested for anti-glycation activity, in which compounds 2 and 3 showed potent activities (IC₅₀ values of 246.97?±?0.83 and 262.37?±?0.22 µM, respectively) compared to IC₅₀ value 294.50?±?1.5 µM of rutin. Moreover, compound 4 exhibited a comparable activity to rutin (IC₅₀?=?293.28?±?1.34 µM). Compound 5 showed a weak activity.

Compounds 2, 3, and 4 exhibited potent DPPH radical scavenging activity (IC₅₀?=?0.1?±?0.00, 0.13?±?0.00 and 0.15?±?0.01 µM, respectively). Compounds 2, 3, and 4 demonstrated significant superoxide anion scavenging activity with IC₅₀ values of 0.14?±?0.001, 0.17?±?0.00, and 0.11?±?0.006 µM, respectively.     

当归挥发性有机物的SPME/GC-MS分析

采用不同极性的SPME萃取吸附了当归的挥发性有机物,并用GC-MS定性和相对定量,比较了不同萃取时间和不同萃取温度下所获得的挥发性有机物的差异。结果表明:藁本内酯和α-蒎烯是其主要成分。随着萃取时间的延长,α-蒎烯含量逐渐减少,藁本内酯含量逐渐升高;随着萃取温度的升高,低沸点化合物含量逐渐减少,高沸点化合物含量逐渐增加。     

高效液相色谱法测定杜仲叶中的绿原酸

 采用高效液相色谱法测定杜仲叶中绿原酸的含量。所用色谱柱为Shim-packCLC-ODS柱,以巯嘌呤为内标,以甲醇-0.01mol/L磷酸二氢钾缓冲液(体积比为25∶75;pH3.9)为流动相,UV检测波长为328nm。在上述色谱条件下,当绿原酸质量浓度为25～300mg/L时,以绿原酸对照品溶液与内标液的峰面积比为纵坐标(Y),绿原酸的质量浓度为横坐标(X),二者呈良好的线性关系,线性方程为Y=8.0368X+1.275×10-3,r=0.9999;平均回收率为99.89%,RSD=1.45%(n=6)。     

杜仲树皮、新鲜叶片和杜仲愈伤组织块有效成分的含量测定

对杜仲树皮（市售）、杜仲新鲜叶片、杜仲幼苗各种愈伤组织块（茎段、幼叶、子房、花药经ＭＳ培养基附加生长调节素培养诱导而得的愈伤组织）的有效成分进行研究，证明它们有一些相同成分。用２，６－二氯酚靛酚滴定法测定了它们维生素Ｃ的含量；用紫外分光光度法测定了它们的桃叶珊瑚甙的含量；用薄层层析－分光光度法测定了它们的氯原酸的含量。