Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated...Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.展开更多
目的研究流动剪应力与活血化瘀药物丹参山楂提取物联合应用抗血栓的作用机制。方法采用生物力药理学的研究方法,利用Bio Flux1000控剪应力微流培养系统,分别施加0.1、0.9 Pa剪应力并联合不同剂量丹参山楂提取物对血管内皮细胞(HUVECs)...目的研究流动剪应力与活血化瘀药物丹参山楂提取物联合应用抗血栓的作用机制。方法采用生物力药理学的研究方法,利用Bio Flux1000控剪应力微流培养系统,分别施加0.1、0.9 Pa剪应力并联合不同剂量丹参山楂提取物对血管内皮细胞(HUVECs)进行预处理后,用ox-LDL诱导内皮细胞损伤,采用酶联免疫吸附法(ELISA)检测细胞上清液中PAI-1、t-PA、ICAM-1的含量;采用RT-PCR法分别测定PAI-1、t-PA、ICAM-1基因表达。结果丹参山楂提取物能下调内皮细胞中PAI-1 m RNA的相对表达,减少内皮细胞中PAI-1的分泌;与低剪应力相比,正常剪应力联合大剂量丹参山楂提取物能够上调内皮细胞中t-PA m RNA的表达,增加内皮细胞分泌t-PA;在低剪应力条件下,丹参山楂提取物可明显抑制ICAM-1的表达。结论正常水平剪应力联合丹参山楂提取物能够通过调节纤溶系统的稳定性来抑制血栓形成;丹参山楂提取物能够通过抑制内皮细胞中PAI-1的表达产生抗血栓效应;在病理剪应力条件下,丹参山楂提取物对抑制ICAM-1表达的药效更加显著。展开更多
The content of polyphenolic compounds including chlorogenic acid,vitexin-4″-O-glucoside,vitexin rhamnoside,rutin,vitexin,hyperoside in leaf of Crataegus pinnatifida Bunge var.major N.E.Br.at different times was deter...The content of polyphenolic compounds including chlorogenic acid,vitexin-4″-O-glucoside,vitexin rhamnoside,rutin,vitexin,hyperoside in leaf of Crataegus pinnatifida Bunge var.major N.E.Br.at different times was determined by HPLC.The results show that the content of polyphenolic compounds in different times is various.In April,the total content of polyphenolic compounds and the contents of chlorogenic acid,vitexin-4″-O-glucoside,vitexin rhamnoside,rutin reach the peak.And the content of every compound and the total content of these compounds decrease gradually with the plant growing,and reach the lowest point in July to August.Therefore,in order to extract polyphenolic compounds,the optimal harvest time for C.pinnatifida var.major leaf is April.展开更多
文摘Two new C-glucoside flavonoids, namely 8-C-b-D-(2-O-acetyl) glucofuranosyl apigenin and 3-O-acetylvitexin, were isolated from leaves of Crataegus pinnatifida Bge. var. major N. E. Br.. Their structures were elucidated by the spectroscopic means and chemical evidence.
文摘目的研究流动剪应力与活血化瘀药物丹参山楂提取物联合应用抗血栓的作用机制。方法采用生物力药理学的研究方法,利用Bio Flux1000控剪应力微流培养系统,分别施加0.1、0.9 Pa剪应力并联合不同剂量丹参山楂提取物对血管内皮细胞(HUVECs)进行预处理后,用ox-LDL诱导内皮细胞损伤,采用酶联免疫吸附法(ELISA)检测细胞上清液中PAI-1、t-PA、ICAM-1的含量;采用RT-PCR法分别测定PAI-1、t-PA、ICAM-1基因表达。结果丹参山楂提取物能下调内皮细胞中PAI-1 m RNA的相对表达,减少内皮细胞中PAI-1的分泌;与低剪应力相比,正常剪应力联合大剂量丹参山楂提取物能够上调内皮细胞中t-PA m RNA的表达,增加内皮细胞分泌t-PA;在低剪应力条件下,丹参山楂提取物可明显抑制ICAM-1的表达。结论正常水平剪应力联合丹参山楂提取物能够通过调节纤溶系统的稳定性来抑制血栓形成;丹参山楂提取物能够通过抑制内皮细胞中PAI-1的表达产生抗血栓效应;在病理剪应力条件下,丹参山楂提取物对抑制ICAM-1表达的药效更加显著。
文摘The content of polyphenolic compounds including chlorogenic acid,vitexin-4″-O-glucoside,vitexin rhamnoside,rutin,vitexin,hyperoside in leaf of Crataegus pinnatifida Bunge var.major N.E.Br.at different times was determined by HPLC.The results show that the content of polyphenolic compounds in different times is various.In April,the total content of polyphenolic compounds and the contents of chlorogenic acid,vitexin-4″-O-glucoside,vitexin rhamnoside,rutin reach the peak.And the content of every compound and the total content of these compounds decrease gradually with the plant growing,and reach the lowest point in July to August.Therefore,in order to extract polyphenolic compounds,the optimal harvest time for C.pinnatifida var.major leaf is April.