槲

Their structures were identified by physico-chemical properties and spectral analysis. RESULTS Seven compounds were isolated as kaempferol,quercetin,astragalin,isoquercitrin,kaempferol-3-O-β-D-glucuronic acid methyl ester,4-hydroxybenzonic acid,hentriacontane.

结果分离得到7个已知化合物，分别为山柰酚、槲皮素、山柰酚-3-O-β-D-吡喃葡萄糖苷、槲皮素-3-O-β-D-吡喃葡萄糖苷、山柰酚-3-O-β-D-吡喃葡萄糖醛酸甲酯、对羟基苯甲酸、三十一烷。

Objective: To develop a HPLC method for the determination of quercetin in Quercetin capsule .

目的 ：建立反相高效液相色谱法检测槲皮素胶囊中槲皮素含量方法。

After being purified by the B-8 resin, the contents of the total flavonoids and quercitrin were raised 2.48 times and 3.29 times more than those before purification respectively.

总黄酮与槲皮苷的保留率达70%、95%以上，峰1~3的保留率达90%以上，纯化后总黄酮及槲皮苷的含量分别提高了2.48倍和3.29倍。

Results Eleven compounds were isolated and identified as:quercetin(1),kaempferol(2),quercitrin(3),protocatechuic acid(4),gallic acid(5),protocatechuic acid ethyl ester(6),ethyl gallate(7),vanillic acid(8),1,5,7-trihydroxyl-3methylan...

结果得到11个化合物，分别鉴定为：槲皮素(1)、山柰酚(2)、槲皮苷(3)、原儿茶酸(4)、没食子酸(5)、原儿茶酸乙酯(6)、没食子酸乙酯(7)、香草酸(8)、1，5，7-三羟基-3-甲基蒽醌(9)、琥珀酸(10)、5-羟甲基糠醛(11)。结论化合物6、7、9、11为首次从该属植物中分离得到。

With the increase of microwave extraction time,extraction yields of rutin,epicatechin,quercitrin and quercetin were firstly increased and then decreased.

在提取压力超过400kPa时，芦丁开始失去一个芸香糖转化为槲皮素；随着微波照射时间的延长，芦丁、表儿茶素和槲皮素提取产率先增加，而后下降。

Methods Spectrophotometric method was used to detect the total flavonoids, and HPLC was used to determine quercitrin and analyze the characteristic peaks of Fingerprint.

以总黄酮、槲皮苷含量结合指纹图谱主要特征峰面积保留率为考察指标；采用可见分光光度法测定总黄酮含量，HPLC法测定槲皮苷含量，HPLC法分析指纹图谱主要特征峰面积。

Flavonoids (hyperin, rutin, quercitrin and quercetin) and saponins compounds from Acanthopanax Senticosus Harms have been extracted by means of a microwave-assisted extraction technique.

利用微波辅助萃取法萃取刺五加中的黄酮类(金丝桃苷、芦丁、槲皮苷、槲皮素)化合物和皂苷类化合物。

Microbial transformation offers new access to gain quercetin and rhamnose.

种新型的槲皮素、鼠李糖生产方法。关键词：微生物转化；芦丁；槲皮素；鼠李糖

Their chemical structures were characterizd on the basis of spectral and chemical evidences to be: Sarracenin (1), 2-methyl-5-hydroxy-7-O-ethyl caffeate chromome (2), Naringenin(3), 2-methyl-5, 7-dihydroxychromome (4), 2-methyl-6-hydroxyl-cinnamic acid methyl ester (5), eriodictyol (6), quercetin (7), Naringenin-7-O-β-D-glucoside( 8 ), eriodictyol-7-O-α-D-glucoside (9), quercetin-3-O-β-D-glucoside(10). In addition, one compound was abtained from the n-butanol frationk, which was finally identified as Morrosiside(11) by spectral and chemical evidences.

以波谱数据及其理化性质鉴定为：Sarracenin(1)，2-甲基-5-羟基-7-O-咖啡酸乙酯色原酮(2)，柚皮素(3)，2-甲基-5，7-二羟基色原酮(4)，2-甲基-6-羟基苯丙烯酸甲酯(5)，圣草酚(6)，槲皮素(7)，柚皮素-7-O-β-D-葡萄糖苷(Naringenin-7-O-β-D-glucoside)(8)，圣草酚-7-O-α-D-葡萄糖苷(eriodictyol-7-O-α-D-glucoside)(9)，槲皮素-3-O-β-D-葡萄糖苷(quercetin--3-O-β-D-glucoside)(10)；另外从正丁醇萃取部位分离得到1个化合物，以波谱数据和文献对照鉴定为：Morroniside(11)。

A determination method was established for quercetin and kaempferol by HPLC. The contents of quercetin and kaemprol in Chenopodium ambrosioides L.

采用HPLC建立了槲皮素和山柰素的含量测定方法，土荆芥中槲皮素和山柰素的平均含量分别为0.25mg/g和1.03mg/g。

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。