诃子抑菌活性成分筛选和总鞣质含量测定新方法

为了建立一种HPLC检测抑菌活性成分诃子总鞣质含量的新方法,在HPLC条件:流动相为乙腈-0.05%磷酸溶液梯度洗脱,检测波长为270 nm,流速为1 m L/min,柱温为30℃,色谱柱为Sepax Sapphire C18(250 mm×4.6 mm,5μm)下利用诃子鞣质中含量最高的成分诃子酸对药材中总鞣质进行含量测定。诃子酸在相应浓度内与色谱峰面积呈良好线性关系,平均加样回收率在97.22%~101.38%之间,RSD为1.62%。研究结果表明,该方法与比色法相比操作更简单,结果更准确。利用HPLC法来测定抑菌成分诃子总鞣质含量,可以更准确地对诃子进行质量控制。     

玄参饮片质量控制方法研究北大核心CSCD

研究中药质量评价中一测多评与指纹图谱结合的考察模式,以重庆市售玄参饮片为研究对象,以肉桂酸为参照物建立玄参饮片HPLC指纹图谱及其与其余成分的相对校正因子,并计算其含量,实现一测多评。结合建立的玄参HPLC指纹图谱,对饮片进行相似度评价,并进行聚类分析和主成分分析。结果建立了玄参饮片HPLC指纹图谱,标定了18个共有峰,指认了其中3个共有峰,11批饮片相似度在0.731～0.960之间,16批饮片中只有11批饮片含量符合药典规定,并将其有效地区分为三类。结果表明一测多评结合指纹图谱的质量控制模式适合于玄参饮片质量评价,重庆市售玄参饮片质量参差不齐,应加强中药饮片的规范化生产。     

基于HPLC指纹图谱、化学计量学和网络药理学技术探讨锁阳的质量标志物

目的:建立锁阳的HPLC指纹图谱,结合化学计量学和网络药理学技术探讨锁阳的最佳质量标志物(Q-marker),为锁阳的质量控制与评价提供参考.方法:采用高效液相色谱法(HPLC)建立锁阳的指纹图谱,建立正交偏最小二乘(OPLS)模型探讨HPLC指纹图谱上的质量差异性成分;从TCMSP、TTD、BATMAN-TCM等数据...     

玄参饮片质量控制方法研究

研究中药质量评价中一测多评与指纹图谱结合的考察模式,以重庆市售玄参饮片为研究对象,以肉桂酸为参照物建立玄参饮片HPLC指纹图谱及其与其余成分的相对校正因子,并计算其含量,实现一测多评。结合建立的玄参HPLC指纹图谱,对饮片进行相似度评价,并进行聚类分析和主成分分析。结果建立了玄参饮片HPLC指纹图谱,标定了18个共有峰,指认了其中3个共有峰,11批饮片相似度在0.731~0.960之间,16批饮片中只有11批饮片含量符合药典规定,并将其有效地区分为三类。结果表明一测多评结合指纹图谱的质量控制模式适合于玄参饮片质量评价,重庆市售玄参饮片质量参差不齐,应加强中药饮片的规范化生产。     

黄花菜药材性状鉴别、HPLC指纹图谱建立及多组分含量测定

通过性状鉴别、含量测定和指纹图谱建立三个方面开展黄花菜药材质量研究,首先对不同产地黄花菜润湿后展开,测量各结构数据,并对测量结果进行相关性分析。其次采用HPLC法测定多批次黄花菜指纹图谱及主要成分含量,并对各批次指纹图谱进行相似性评价和主成分分析。本实验建立了黄花菜药材HPLC指纹图谱,确定了45个共有峰,根据对照品指认了4个共有峰,并对其含量进行测定。实验结果显示黄花菜药材的外部形态具有显著性差异,且和产地、海拔、经纬度等有一定的关联。研究结果可以为黄花菜药材的质量控制提供可靠评价方法。     

滁菊的HPLC指纹图谱制作及其化学计量学分析

建立滁菊的HPLC指纹图谱,结合化学计量学手段对不同滁菊的指纹图谱进行分析研究,以期为滁菊的质量控制和产地追溯提供依据。采用HPLC法建立指纹图谱,并用中药色谱指纹图谱相似度评价系统(2012版)和系统聚类、主成分分析2种化学计量学法对指纹图谱和特征峰进行分析。分析结果发现样品有27个共有峰,12个滁菊样品具有较高的相似度,杭菊与滁菊的相似度较差,聚类分析与主成分分析结果和相似度分析结果一致。将HPLC指纹图谱与化学计量学结合可对滁菊进行鉴别和质量评价,为其质量控制和追溯提供了理论参考。     

金银花配方颗粒、标准汤剂含量测定及指纹图谱研究

本文主要为金银花配方颗粒的质量评价提供依据,并建立金银花配方颗粒、标准汤剂含量测定及HPLC指纹图谱的研究方法。主要采用HPLC法测定金银花饮片、标准汤剂、配方颗粒绿原酸、木犀草苷含量,建立三者指纹图谱共有模式。结果显示金银花饮片、标准汤剂、配方颗粒中绿原酸、木犀草苷含量差异较大;分别建立金银花饮片、标准汤剂、配方颗粒的指纹图谱;金银花配方颗粒HPLC指纹图谱中的12个共有峰均可在标准汤剂中追踪到,有11个可以在饮片中得到追踪,并指认出绿原酸、芦丁、木犀草苷3种成分。表明所建立的定性、定量分析方法简便,准确度高,专属性强,对金银花配方颗粒的鉴定及质量控制具有指导意义和参考价值。     

化学模式识别结合HPLC指纹图谱的僵蚕质量评价研究

建立HPLC指纹图谱结合化学模式识别技术对僵蚕药材进行质量评价。采用Insertsil ODS-3(4.6 mm×250 mm,5μm)色谱柱,以乙腈-0.1%磷酸水溶液为流动相梯度洗脱,检测波长365 nm,流速0.8 mL/min,进样量10μL,柱温30℃。采用相似度评价、聚类分析、主成分分析等化学模式识别方法,对不同来源的20批僵蚕药材进行质量分析和评价。建立的指纹图谱标定了9个共有峰,指认了5个峰,1号峰为芦丁,2号峰为金丝桃苷,4号峰为紫云英苷,6号峰为槲皮素,7号峰为山奈酚,并将9个共有峰峰面积与其性状、总灰分、酸不溶性灰分、浸出物及白僵菌素含量进行相关性分析。结果表明本研究建立的僵蚕HPLC指纹图谱结合化学模式识别的方法可靠、易行,方法重复性好、专属性强,与药材性状、总灰分、浸出物及白僵菌素含量等质控指标均有一定的相关性,为后续僵蚕药材的质量控制提供依据和参考。     

不同品种玫瑰花药材的HPLC指纹图谱研究

目的:建立中药玫瑰花的高效液相色谱指纹图谱,为科学评价和有效控制其质量提供可靠的方法。方法:用HPLC-UV方法测定了11份玫瑰花样品,采用中国药典委员会颁布的"中药色谱指纹图谱相似度评价"2004A系统建立了玫瑰花药材指纹图谱,并进行相似度评价和聚类分析。结果:11份玫瑰花样品的HPLC指纹图谱有18个共有峰,有10份样品相似度都在0.8以上,聚类分析时归为一类。结论:建立了玫瑰花不同品种的HPLC指纹图谱,并比较了其之间的差异,该方法稳定、可靠、精密度高、重复性好,可为中药玫瑰花的质量评价体系的建立提供科学依据。     

不同产地桔梗HPLC指纹图谱及化学模式识别研究

为建立桔梗HPLC指纹图谱并对其质量控制方法进行探讨。研究采用YMC Hydrosphere C_(18)分析色谱柱(250×4.6 mm,5μm),以水和乙腈为流动相进行梯度洗脱,检测波长210 nm。建立不同产地15批桔梗药材HPLC指纹图谱。采用相似度评价、聚类分析、主成分分析和正交偏最小二乘判别分析等化学模式识别方法对不同产地桔梗质量及其控制方法进行分析和评价。建立的桔梗HPLC指纹图谱共标定21个共有峰,并通过对照品指认其中7个成分;不同产地桔梗相似度在0.927～0.991之间;聚类分析和主成分分析结果都将15批桔梗分为3类,利用正交偏最小二乘判别分析筛选出造成桔梗差异的13个色谱峰。本研究建立的HPLC指纹图谱结合化学模式识别的方法简便准确,能够为桔梗的质量控制和品质评价提供依据。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.