香豆素

Osthole and TCFC reduced the bone lose by decreasing the osteoclast formation, its TRAP activity, and osteoclastic bone resorption.

蛇床子素和蛇床子总香豆素是通过抑制破骨细胞的形成、抗酒石酸酸性磷酸酶的活性和骨吸收作用减少骨质丢失的。

In fuits, flavonoides showed higher content in young fruits stage and fruit mature period, coumarins and polyshaccharides in fruit developmemt time and mature period, oleanolic acid in young fruit stage and fruit overripen stage.

果实中黄酮含量高峰期出现在幼果期和果实成熟期、香豆素和多糖含量高峰期出现在座果期和果实成熟期，齐墩果酸含量高峰期出现在幼果期和果实过熟期。

In leaves, flavonoids showed higher ammount in fruits premature time and fruit overripen period, coumarins in fruit development stage and ripening stage, polyshaccharides in leaf development time and fruit mature period, oleanolic acid in fruit mature period

沙棘叶片中黄酮类成分含量高峰期出现在果实停止生长时期和过熟期，香豆素含量高峰期出现在座果期和果实成熟期，多糖在展叶期和果实成熟期出现含量高峰，齐墩果酸在果实成熟期出现含量高峰

The method is simple and accurate; and it can be used for determining of the total coumarins in Angelica polymorpha Maxim.

该方法简单、准确，可用于白根独活药材中总呋喃香豆素的含量测定。

An UV spectrophotometry for determining total coumarins in Angelica polymorpha Maxim.

建立紫外分光光度法测定白根独活中总香豆素的含量。

The total yield and ee value of the enantiomer were 12% and 98.7% respectively. The total yield of the racemic one was 17%, 2.5 fold more than the previously publishable route.

整条路线具有高产率高ee值的特点，将会成为合成此类直型二氢苯并呋喃香豆素的流行方法。

Results: Nine compounds were obtained from the ethyl acetate fraction of C. speciosa and were identified as methyl chlorogenate, 5-O-cafeoyl quinic acid butyl ester, quinic acid butyl ester, 5-hydroxymethyl-furan-2-carbaldehyde, triacontanoic acid,-epicatichin, 7,8-dihydroxy-coumanrin, protocatechuic acid ethyl ester, and protocatechuic acid.

结果：从皱皮木瓜的乙酸乙酯萃取部位分离鉴定了9种化合物，分别为绿原酸甲酯，5-O-咖啡酰基－奎宁酸丁酯，奎宁酸丁酯，5-羟甲基－2-糠醛，三十烷酸，-表儿茶素，7，8-二羟基香豆素，3，4-二羟基苯甲酸乙酯，原儿茶酸。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydride has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

The yield of coumarin could be reached up to 86.6% with lower consumption of acetic anhydride in case the total molar ratio of acetic anhydride to salicylaldehyde=1 9∶1 and the reaction was...

水杨醛与乙酸酐的总摩尔比为 1∶1.9，反应近终点时在( 2 14± 2 )℃保温反应 0 。5h，香豆素收率达 86.6%。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydri de has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

摘 要 对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。