中药黄连有效成分盐酸小檗碱与牛血清白蛋白的相互作用

从天然中药材黄连中提取分离并精制得到盐酸小檗碱(BC),采用UV光谱和荧光光谱(FS)研究其与牛血清白蛋白(BSA)的相互作用,解释了BC导致BSA的荧光发射光谱峰裂分的现象,其二重峰分别归属于色氨酸及酪氨酸残基.结果表明,静态猝灭和非辐射能量转移是导致BC对BSA荧光猝灭的两大原因,BC与BSA的表观结合常数K_A为8.66×10⁴L/mol(30℃)和8.72×10⁴L/mol(37℃),BC在BSA分子上的结合位点数为(3.1±0.2).BC与BSA分子中荧光性氨基酸残基之间的距离为3.75nm(30℃)和3.62nm(37℃),表明BC的部分片段能够插入BSA分子内部.热力学函数计算结果表明,该作用过程是一个熵增加、Gibbs自由能降低的自发超分子作用过程,并由此推断BC与BSA之间以疏水相互作用为主.     

A-Study of the Constituents of the Bark of Tsuga Chinensis Pritz. Var. Formosana (Hay.)

The bark of the Taiwan hemlock was found to contain long-chain alcohols, acids and esters, campesterol, β-sitosterol, 13-epimanool, larixol, dihydroconiferyl alcohol and the corresponding esters, p-hydroxybenzoic acid, kaempferol, epiafzelechin, epicatechin and a novel compound of (3,5-dihydroxy-2-methyl)phenyl 4′-hydroxybenzoate.     

紫荆花与玫瑰茄微量元素含量的比较研究

首次报道紫荆花十种微量元素含量，并与玫瑰茄作了含量比较研究．     

NMR-based metabolic study of leaves of three species of Actinidia with different degrees of susceptibility to Pseudomonas syringae pv. actinidiae

Abstract

Bacterial canker of Actinidia, caused by the bacterium Pseudomonas syringae pv. actinidiae (Psa), is the most serious disease of these plants worldwide. Leaves of three species of Actinidia, namely A. chinensis var. chinensis, A. chinensis var. deliciosa and A. arguta, having different degrees of tolerance to Psa, were analyzed by Nuclear Magnetic Resonance spectroscopy. Aqueous extracts of leaves were studied and several metabolites, classified as organic acids, amino acids, carbohydrates, phenols and other metabolites, were identified by 1D and 2D NMR experiments and quantified. The metabolic profiles of these species were compared through univariate statistical analysis ANOVA and multivariate PCA. Levels of metabolites with known antibacterial activity, such as caffeic and chlorogenic acids, were observed to be higher in the A. arguta samples. Moreover, these metabolites have different Pearson correlation patterns among the three Actinidia species, suggesting a difference at the phenylpropanoid biosynthetic pathway.     

紫荆花红色素的提取及其稳定性研究

报道了从苏木科植物紫荆（CersischinensisBunge）的花中提取天然红色素的方法。对提取条件进行了优化实验，并在不同条件下考察了紫荆花红色素的稳定性。     

中药白头翁化学成份的核磁共振研究

中药白头翁为莨科白头翁属植物,临床用于治疗阿耙和细菌性痢疾。 其化学成份主要为三萜苷,苷元为羟基白桦酸。从该植物根茎中分得一新的皂苷,本文采用最近提出的二维解力HOHAHA,一维多重接力COSY和选择性远程~13CDEPT 等新技术进行了研究,其结构确定为23-羟基白桦酸-28--O-β-D-吡喃葡萄糖-C-67-β-D-吡喃葡萄糖。     

Two New Triterpenes from Astilbe chinensis

Astilbe chinensis (Maxim.) Franch. et Sav. is a perennial herbaceous plant growing in China, Russia, Japan, and Korea. Its rhizome has been used for headache, arthralgia, chronic bronchitis and stomachalgia in traditional Chinese medicine1. Pharmacologica…     

反相高效液相色谱法同时测定黄连中巴马亭及小檗碱的含量

采用反相高效液相色谱法同时测定黄连中巴马亭及小檗碱的含量,色谱条件:ODSC18色谱柱(4.6mm×250mm);流动相为乙腈∶0.05mol/L磷酸二氢钠水溶液(pH2.5)=30∶70(V/V);流速0.6mL/min;测定波长268nm.巴马亭和小檗碱的回归方程分别为C=1.696×10-5A+0.8401,R2=0.9999;RSD=0.015%和C=1 580×10-5A+0.5114,R2=0.9999,RSD=0.14%.回收率分别为99.09%～101.30%和98.96%～101.86%.此方法准确、快速、简单.     

超分子有序聚集凝固液相微萃取及其对五味子中木脂素类化合物的测定及质量评价

通过分析比较漂浮有机液滴凝固液相微萃取(SFODLPME)对木脂素类化合物萃取前后紫外光谱的变化, 提出了超分子有序聚集凝固液相微萃取(SSMOALPME)机理; 建立了简单、 快速、 灵敏的SSMOALPME高效液相色谱法(HPLC)同时测定中药五味子中5种低丰度木脂素类化合物含量的方法, 并对不同产地五味子的质量进行比较和评价. 在最佳的SSMOALPME条件下, 测得五味子醇甲, 五味子酯甲, 五味子甲素, 五味子乙素和五味子丙素的线性范围分别为2.48×10^-3~6.21, 2.27×10^-3~28.5, 2.31×10^-3~28.8, 2.27×10^-3~5.69和1.05×10^-3~5.25 μg/mL; 检出限分别为0.4, 0.4, 0.4, 0.08和0.08 ng/mL; 日内及日间精密度RSD<9.7%; 药材中分析物的回收率为91.9% ~104.7%; SSMOALPME对5种分析物的富集倍数分别在39 ~529倍之间. 本法测定结果与药典法测定结果相比无显著差异(P=95%). SSMOALPME方法的提出为液相微萃取的理论研究奠定了基础, 为反映中药多成分、 多靶点及协同作用的特性, 建立科学的质量控制方法提供了理论依据和实验基础.     

生态技术栽培黄连的红外指纹图谱分析与表征

分析研究不同的遮荫条件(人工棚架、杉树林下、玉米林下等)和不同的生长年限(1～5年)栽培黄连的红外光谱的“指纹特征”,凭借直观而相对量化的红外特征峰的相对强度来阐明对黄连生长影响的整体变化规律,确定生态技术栽培黄连药材的可行性。采用傅里叶变换红外光谱技术(FTIR),从分子水平上快速准确无损地检测由于生长环境的不同而影响黄连生长的原因。遮荫条件不同对黄连根茎的整体质量无明显影响。生长年限对黄连药材中盐酸小檗碱的含量略有影响, 与HPLC的测定结果基本吻合。生态技术栽培黄连与传统人工搭棚方式栽培黄连其质量基本上是一致的。这一方法和技术对道地药材的规范化种植具有指导意义。