Betulin

Abstract : Objective To investigate the effects and mechanism of betulin on rats with alcoholic liver disease .

目的：观察白桦脂醇对大鼠酒精性肝损伤的保护作用及其机制。

Research progress and foreground of betulin and betulinic acid

白桦脂醇、白桦脂酸的研究进展及其前景

Betulin and betulinic acid are remarkable natural products .

白桦脂醇和白桦脂酸是非常有价值的天然产物。

Betulin relative advantages of betulinic acid modified with three points , looked after the modification activity strengthened .

桦木醇相对桦木酸的优势有三个修饰位点，进行修饰后望给予活性加强。

The contain of betulin and betulinic acid are analyzed by GC .

利用GC色谱法测定了长白山白桦树皮中白桦脂醇和白桦脂酸的含量。

Selective oxidation of betulin for betulinic acid preparation

非金属选择性催化氧化桦木醇制备桦木酸

HPLC Determination of Catechin and Betulin in White Birch Bark

高效液相色谱法测定白桦树皮中儿茶素和白桦酯醇的含量

Preliminary Study on Betulinic Acid and Betulin Derivatives ' Anti-cancer Acitivity and Mechanism in Inducing Cell Apoptosis

桦木酸及桦木醇衍生物抗癌活性和诱导凋亡机理初步研究

Betulin and betulinic acid are remarkable natural products . They are obtained from a variety of botanical sources .

白桦酯醇和白桦酯酸是非常有价值的天然产物，它们可以从丰富的植物资源中获得。

Yield of crude betulin extracted from bark of birch was34.52 % by weight .

结果表明：从白桦树皮中提取桦木醇粗品的得率为34.52%；

Betulin extracted from bark of birch ( Betula platyphylla Suk . )

本研究从白桦树皮中提取了桦木醇。

All the results were as follows : ( 1 ) 3,28-di-O-itaconic-betulin was successfully obtained by itaconic anhydride and betulin as raw materials .

研究结果如下：（1）以桦木醇、衣康酸酐为原料合成了桦木醇衣康酸酯。

Negotiation on Diplomatic Normalization of Japan & Soviet Union and Struggle of Political Parties in Japan ; HPLC Determination of Catechin and Betulin in White Birch Bark

日苏邦交正常化谈判与日本国内党派斗争高效液相色谱法测定白桦树皮中儿茶素和白桦酯醇的含量

Several countries have already has extensive research into the chemical composition of birch bark , Birch in the result indicates that it is rich in Betulin and part of betulinic acid .

国外早已对白桦树皮化学组成进行了广泛的研究，结果显示它含有丰富的桦木醇和部分桦木酸等。

MATERIAL AND METHODS : Betulin was isolated from dry powder of the bark of silver birch ( Betula platyphylla Suk ) by using ethanol circumfluence , decompress concentration and methanol-chloroform recrystallization .

材料与方法取一定量的白桦树皮干粉，通过乙醇回流，减压浓缩和甲醇-氯仿重结晶等步骤获得白桦酯醇纯品。

OBJECTIVE In the present study , the hepatoprotective activitis and molecular mechanism of Betulin and Betulinic acid ( BT & BA ) were investigated on acute liver failure induced by D-galactosamine ( D-GalN ) / Lipopolysaccharides ( LPS ) in vitro .

目的：探讨白桦酯醇和白桦酯酸对D-氨基半乳糖联合内毒素诱导急性肝衰竭动物模型的保护作用及其分子机制。

The most excellent mix-solvent was tetrahydrofuran-benzene . At the ratio of tetrahydrofuran to benzene 1:2 by volume , and ratio of betulin to mix-solvent was 1:30 ( g : mL ), yield of purified betulin was 31.19 % , with a purity of 94.53 % .

混合溶剂四氢呋喃-苯是纯化桦木醇的优良试剂，其体积比为1：2，桦木醇与混合溶剂比为1：30（g：mL），纯化桦木醇得率为31.19%，纯度为94.53%。