白桦醇

Results Eleven compounds were purified and their structures were identified, they were identified as β-sitosterol, stigmasterol, nonacosanyl caffeate, daucosterol, betulinic acid, vanillic acid, inositol methyl ether, sucrose, soyasaponin Ⅰ, kaikasaponin Ⅲ, and dehy-drosoyasaponin Ⅰ.

结果 分得11个已知化合物，经鉴定为β-谷甾醇、豆甾醇、咖啡酸二十九醇酯、胡萝卜苷、白桦酸、香草酸、肌醇甲醚、蔗糖、soyasaponin Ⅰ、kaikasaponin Ⅲ和dehy-drosoyasaponin Ⅰ。

It is significant to study the pharmaceutical activities of betulin ,betulinic acid andtheir derivatives and to confirm the relationship between th...

研究白桦脂醇、白桦脂酸及其衍生物的药理活性，确定结构与活性间的关系，对筛选出更为经济、有效的药物成分具有重要意义。

In addition a simple process was also developed to obtain purified betulin using chloroform / NaOH two-phase solvent extraction.

另外还建立了一种在碱性条件下用氯仿/水溶液混合溶剂来一步纯化白桦树皮中的白桦酯醇的方法。

They are obtained from avariety of botanical sources and betulinic acid can be easily prepared from the more plentifulprecursor betulin in a simple two-step process.

它们可以从丰富的植物资源中获得，白桦脂酸也可由更丰富的前体白桦脂醇经简单的两步制得。

Betulin, betulinic acid and many of their derivatives exhibit great promise as bioactive agents for the treatment of HIV infection and cancer.

白桦酯醇、白桦酯酸及其衍生物作为生物制剂在HIV和癌症治疗方面表现出了巨大的潜能。

Betulin,betulinic acid and many of theirderivatives exhibit great promise as bioactive agents for the treatment of HIV infection andcancer.

白桦脂醇、白桦脂酸及其衍生物作为生物制剂在 HIV 和癌症治疗方面表现出了巨大的潜能。

MATERIAL AND METHODS: Betulin was isolated from dry powder of the bark of silver birch 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。

In the forth chapter, betulin was oxidized by Jones oxidation in step 1 and converted to betulonic acid, then betulonic acid was reduced by sodium borohydride in step 2 and converted to betulinic acid.

第四章使用琼氏氧化剂氧化白桦酯醇，硼氢化钠还原制得白桦酯酸。

Our strong products are: Rhodiola rosea extract, Luteolin, Chamomile extract, Apple extract, Betulin, Betulinic acid, Red wine P.E., Bamboo leaf extract, etc.

公司核心产品有红景天提取物，木犀草素，洋甘菊提取物，苹果提取物，红酒提取物，白桦酯醇，白桦酯酸，竹叶提取物等。

Betulin, extraction, solubility, betulinic acid, derivative, synthesis

关键字或关键词组：白桦酯醇，提取，溶解度，白桦酯酸，衍生物，合成

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。