高效液相梯度洗脱法测定灵杞黄斑颗粒中毛蕊花糖苷和丹酚酸B含量

目的建立同时测定灵杞黄斑颗粒中毛蕊花糖苷和丹酚酸B含量的反相高效液相梯度洗脱法。方法采用Agilent Eclipse XDB-C18(250mm×4.6mm,5μm)色谱柱,流动相:乙腈(A)-0.1%磷酸水溶液(B)进行梯度洗脱,梯度洗脱程序为进样0～8min,调节流动相A∶B(20∶80,V/V);8～20min,流动相A∶B(30∶70,V/V);20～23min,流动相A∶B(20∶80,V/V);流速:1.0mL·min-1,检测波长:334nm,柱温:30℃,进样量:10μL。结果毛蕊花糖苷和丹酚酸B分别在1.50～14.97mg·L-1和18.92～189.23mg·L-1范围内与峰面积呈良好的线性关系,相关系数分别为0.9998和0.9999,平均加样回收率毛蕊花糖苷为(99.7±s1.1)%,RSD=1.12%,丹酚酸B为(99.5±1.0)%,RSD=1.02%,3批样品中毛蕊花糖苷平均含量均不低于36.9μg·g-1,RSD均不大于1.54%,丹酚酸B平均含量均不低于344μg·g-1,RSD均不大于1.94%。结论该方法简便、快速、准确、灵敏度高、专属性强,可用于灵杞黄斑颗粒剂的质量控制。     

地黄叶总苷浸膏真空带式干燥工艺优化研究

目的研究地黄叶总苷浸膏真空带式干燥的最佳工艺,并与其他干燥方法进行比较。方法以干燥产品含水率及有效成分保留率为评价指标,对影响干燥效果的因素进行考察。在单因素实验结果的基础上,采用L9（34）正交试验法,结合方差分析与多指标综合评分结果,获得地黄叶总苷浸膏真空带式干燥的最佳工艺参数,并将其干燥效果与真空烘箱干燥、微波真空干燥进行比较。结果地黄叶总苷浸膏真空带式干燥的最佳工艺条件为传送带速度4cm·min-1,浸膏进料速度25mL·min-1,加热系统温度75℃,75℃,该条件下地黄叶总苷浸膏干燥产物含水率为2.54%,毛蕊花糖苷保留率和地黄叶总苷保留率分别为94.54%和90.49%。结论优选得到的地黄叶总苷浸膏真空带式干燥工艺稳定可靠。与真空烘箱干燥和微波真空干燥相比,真空带式干燥具有干燥产品含水率低、有效成分保留率高、干燥时间短和可连续生产等优点,为中药浸膏的真空带式干燥工艺设计和过程控制提供了参考。     

近红外光谱法快速分析玄参药材中毛蕊花糖苷含量

目的建立玄参药材指标成分毛蕊花糖苷的近红外光谱快速定量模型。方法采用偏最小二乘法建立玄参药材中毛蕊花糖苷的近红外光谱多元校正模型,并对未知样品进行含量预测。结果校正模型相关系数r=0.998 53,验证集预测误差平方根为0.027 3,验证集平均相对误差为3.7%。结论近红外光谱检测快速,模型预测效果好,可用于玄参药材中毛蕊花糖苷的快速测定。     

高效液相色谱法测定藿香清胃片中毛蕊花糖苷含量

目的测定藿香清胃片中毛蕊花糖苷的含量。方法采用高效液相色谱法,色谱柱为C18柱(250mm×4.6 mm,5μm),以乙腈-0.1%醋酸为流动相,检测波长为334 nm。结果毛蕊花糖苷在0.042~0.42μg范围内线性关系良好,加样回收率为98.43%,RSD为0.44%。结论该法快速、准确,可用于该制剂的质量控制。     

车前子及车前草中毛蕊花糖苷与异毛蕊花糖苷的含量比较

目的:分析比较车前子及车前草中毛蕊花糖苷、异毛蕊花糖苷含量差异,为车前质量控制与临床用药提供实验依据。方法:采用反相高效液相色谱法(RP-HPLC),Diamonsil C18色谱柱(4.6 mm×250 mm,5μm),流动相甲醇-0.1%甲酸水溶液(40∶60),同时测定车前子及车前草中毛蕊花糖苷、异毛蕊花糖苷的含量,流速0.6 m L·min-1,柱温25℃,检测波长330nm。结果:车前子与车前草中毛蕊花糖苷质量分数分别为9.70,0.32 mg·g-1,异毛蕊花糖苷质量分数分别为1.28,1.51 mg·g-1。结论:车前子中毛蕊花糖苷含量高于车前草,异毛蕊花糖苷含量低于车前草,临床应合理用药,并建议车前增加异毛蕊花糖苷为质控指标。     

Mechanism of action of verbascoside on the isolated rat heart: increases in level of prostacyclin

The mechanism of the positive cardioactive effects induced by verbascoside in the Lagendorff rat heart has been investigated. Isolated rat hearts treated with α‐ or β‐ adrenergic agents did not show significant reduction of the positive chronotropism, inotropism and increased coronary perfusion rate mediated by verbascoside. A significant increase in prostacyclin levels (142%) observed following the administration of verbascoside suggests that prostacyclin stimulates formation of cAMP which induces the cardioactivity associated with verbascoside. Copyright © 1999 John Wiley & Sons, Ltd.     

Inhibitory Effect of Verbascoside Isolated from Buddleja brasiliensis Jacq. ex Spreng on Prolyl Oligopeptidase Activity

The phenylpropanoid glycoside verbascoside [2‐(3,4‐dihydroxyphenylethyl)‐1‐O‐α‐l ‐rhamnopyranosyl‐(1→3)‐β‐d ‐(4‐O‐caffeyl)‐glucopyranoside] (1) has been isolated as the main constituent of the crude extract of Buddleja brasiliensis Jacq. ex Spreng from Southern Brazil. The crude extract, main fractions and the compound 1 were evaluated for inhibition of the enzymes acetylcholinesterase (AChE), dipeptidyl peptidase‐IV (DPP‐IV) and prolyl oligopeptidase (POP). Compound 1 showed weak activity against DPP‐IV with an IC₅₀ >> 150 µm and was inactive against AChE, with a pMIQ determined by bioautography of 9.6. In contrast, 1 displayed significant inhibition of POP in a dose‐dependent manner with an IC₅₀ value of 1.3 ± 0.2 µm , similar to the positive control, baicalin, with a POP IC₅₀ of 12 ± 3 µm . Copyright © 2012 John Wiley & Sons, Ltd.     

HPLC测定不同产地广东紫珠中3种苯乙醇苷的含量

目的:采用RP-HPLC-DAD测定不同产地广东紫珠的叶与茎枝中金石蚕苷、毛蕊花糖苷及连翘酯苷B的含量.方法:采用Phenomenex Luna C18色谱柱(4.6 mm ×250 mm,5μm),柱温30℃,流动相乙腈-0.1％乙酸水(20:80),流速1.0mL·min-1,检测波长330 nm.结果:金石蚕苷、毛蕊花糖苷及连翘酯苷B依次在9.96 ～ 498,20.8-1004,10.1～505mg·L-1与峰面积呈良好线性关系;三者平均加样回收率分别为101.3％ (RSD 0.59％),98.7％ (RSD 1.1％),104.2％(RSD 0.71％).不同产地广东紫珠的叶与茎枝中金石蚕苷、毛蕊花糖苷及连翘酯苷B的质量分数范围分别为0.076％ ～ 1.87％,0％～3.19％,0.102％ ～ 1.59％.结论:建立的方法准确、快速、重复性好,可用于同时测定广东紫珠中金石蚕苷、毛蕊花糖苷及连翘酯苷B的含量,为广东紫珠的质量控制提供实验依据.     

Corrective Effect of Verbascoside on Histomorphological Differences and Oxidative Stress in Colon Mucosa of Rats in Which Colon Ischemia–Reperfusion Injury was Induced

BackgroundThis study aims to show the corrective effect of verbascoside on histomorphological and biochemical differences in the colon mucosa of rats in which colon ischemia–reperfusion (I/R) injury was induced.Methods: Fifty Sprague Dawley male rats were divided into 5 groups, of control, sham, ischemia (I), I/R, and I/R+verbascoside.Ischemia and reperfusion were applied to the suitable groups for 30 minutes and 120 minutes respectively, and 10 mg/kg verbascoside was administered intraperitoneally. Histomorphological assessment was done in the colon tissues obtained, and the goblet cells were assessed using the Alcian blue method. Proliferating cell nuclear antigen (PCNA), TUNEL, and hypoxia-induced factor 1 (HIF-1α) assays were used to assess oxidative stress with the immunohistochemical method. Malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), total antioxidant status (TAS), total oxidant status (TOS), oxidative stress index (OSI), and total thiol (TT) levels were checked, for a biochemical analysis of oxidative stress.Results: Compared with the I/R group, histomorphological differences were seen to be corrected in colon epithelium in the I/R+verbascoside group. The goblet cell number increased and cell proliferation was increased, as seen with the PCNA assay; and apoptosis was decreased, as seen with the TUNEL assay. HIF-1α expression also decreased in the drug group. In the drug group, SOD, GSH-Px, TAS, and TT levels increased, but TOS, OSI, and MDA levels decreased.Conclusion: It was seen that verbascoside had a corrective effect on histomorphological and biochemical differences caused by I/R injury.     

苯乙醇苷合成的研究进展

苯乙醇苷（PeGs）是众多药材中的天然活性成分,具有抗氧化、保肝、美白、神经保护等多方面的作用。然而,药材中PeGs含量低且不稳定。近年来,为获得富含PeGs的药材,PeGs生物合成及代谢调控方面的研究被广泛开展。对PeGs在植物和微生物中生物合成与代谢调控研究及其化学全合成和半合成研究进行综述,以期为阐明PeGs的生物合成机制,稳定并提高植物药材中PeGs的含量、提升药材品质,综合利用微生物代谢工程法或化学合成法合成PeGs提供参考。