白桦树皮

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

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

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

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。

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

本研究从白桦树皮中提取了桦木醇。

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

结果表明：从白桦树皮中提取桦木醇粗品的得率为34.52%；

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

我爱抚着光滑的白桦树皮或粗糙的松树皮。

I pass my hands lovingly about the smooth skin of a sliver birch , or the rough shaggy bark of a pine .

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。

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 .

写下的手稿在中世纪被用来教学，写在白桦树皮和棕榈叶上，直到16世纪出现印刷机为止。

While written manuscripts were used for teaching in medieval times , they were written on birch bark or palm leaves , until the advent of the printing press from the16th century .