载药聚合物膜中阿魏酸体外释放研究

目的:在模拟生物体液环境下建立HPLC测定聚合物膜中顺、反式阿魏酸总释放量的方法。方法:色谱柱为迪马DiamonsilC18(美国迪马公司,4.6mm×200mm×5μm),流动相为乙腈-0.1%(φ)磷酸(体积比15:85),流速1.0ml·min-1,检测波长为290nm。结果:在0.052～0.52μg·ml-1范围内阿魏酸浓度与色谱峰面积呈较好的线性关系(r2=0.9998),平均加样回收率为99.70%RSD=1.58%。结论:本方法快速、准确,适用于在模拟生物体液环境下测定载药聚合物膜中顺、反式阿魏酸的总释放量。     

HPLC法测定新疆阿魏不同部位阿魏酸的含量

建立新疆阿魏中不同部位阿魏酸的高效液相色谱含量测定方法.采用PLATISIL ODS(250 mm×4.6mm,5μm)色谱柱,甲醇～0.1％冰醋酸水溶液(35∶ 65)为流动相,流速1.0 mL/min,检测波长320 nm,柱温30℃.测得阿魏酸进样量在0.440～5.396μg/mL(r=0.9997)范围内与峰面积有良好的线性关系,平均回收率达97.8％,RSD为1.79％(n=9).新疆阿魏胶、根、茎和叶中的阿魏酸含量分别为0.2600、0.0362、0.0225和0.0275 mg/g,胶中阿魏酸的含量远高于根、茎和叶.该方法简便、准确、重复性好,可用于新疆阿魏中不同部位阿魏酸含量的测定.     

反相高效液相色谱法测定石榴皮多酚类物质方法的建立及分析

建立了同时测定石榴皮多酚中绿原酸、表儿茶素、鞣花酸和槲皮素含量的反相高效液相色谱方法。采用色谱柱Hypersil ODS2(250 mm×4.6 mm,5μm),其流动相为乙腈-0.4%磷酸溶液(体积比17∶83),流速为1.0m L/min,检测波长310 nm,柱温为30℃。建立安石榴甙测量方法,色谱柱为Hypersil ODS2(250 mm×4.6 mm,5μm);流动相为甲醇-2%冰醋酸(体积比7∶93);体积流量为1.0 m L/min;检测波长为232 nm;柱温25℃。结果表明:绿原酸、表儿茶素、鞣花酸、槲皮素和安石榴甙在一定浓度范围内与峰面积呈良好的线性关系,其平均回收率分别为100.66%(RSD=2.06%)、100.05%(RSD=0.58%)、100.05%(RSD=0.51%)、99.51%(RSD=1.22%)和99.79%(RSD=0.52%)。此结果说明反相高效液相色谱可用于测定石榴皮多酚类物质。     

高效液相色谱法测定西咪替丁片的含量

目的建立HPLC测定西咪替丁片含量的方法。方法固定相:sinochrom ODS-BP 5μm(4.6 mm×250 mm);流动相:甲醇∶水∶三乙胺(80∶20∶0.01),流量为1.0 ml/min;检测波长:218nm,进样量10μl。结果对照品溶液在0.25~2.0μg/ml范围内呈良好的线性关系,相关系数r=0.9996(n=6),平均回收率为99.23%(n=6),RSD为0.4%。结论本法快速、简便、准确、重复性好。     

高效液相色谱法测定川射干鸢尾苷元磺酸钠及其制剂泰克吉宁注射液含量和有关物质

建立高效液相色谱法测定鸢尾苷元磺酸钠(4′,5,7-三羟基-6-甲氧基异黄酮-5′-磺酸钠)及其制剂泰克吉宁注射液的含量及有关物质。采用C18色谱柱(150×4.6mm,5μm),流动相为甲醇-5%醋酸水(80:20),流速为1.0mL/min,检测波长为263nm。鸢尾苷元磺酸钠在11～100μg/mL范围内线性关系良好,回归方程Y=43.3609X-1.5973(r=0.99998),平均回收率为99.77%(n=9)。最低检测限为0.052μg/mL,与有关物质分离良好。本法快速、简便、准确,专属性强。     

RP-HPLC法测定加替沙星眼用凝胶剂含量

目的建立测定加替沙星眼用凝胶剂含量的方法。方法采用RP-HPLC法,色谱柱Diamonsil C18(250mm×4.6mm,5μm),流动相为乙腈-0.3%磷酸溶液(pH 3)(23∶77),流速1.0ml/min,检测波长290nm。结果标准曲线线性范围4.0~40.0μg/ml,r=0.9998;回收率为99.5%,RSD=1.23%;精密度RSD=2.54%。结论该法简便、快速、可靠,完全适合加替沙星眼用凝胶剂质量控制。     

顺式藁苯内酯口服给药在大鼠血浆和脑内的药动学特性(英文)

建立大鼠血浆和脑中Z-槀苯内酯(LIG)浓度测定的高效液相色谱法。采用Agilent Hypersil ODS C18色谱柱(150mm×4.6mm,5μm),流动相为甲醇-5%异丙醇水溶液(60:40,v/v),流速为1.0mL/min,检测波长为280nm。血浆与脑中槀苯内酯浓度线性检测范围分别为93.75~3750ng/m(r=0.9999)和93.75~3750ng/g(r=0.9997),日内及日间精密度RSD10%。本法适用于大鼠口服LIG后血浆及脑中药物浓度的研究。     

HPLC 法测定不同来源槐角中槐角苷含量

目的:建立HPLC法测定槐角中槐角苷含量测定方法并检测不同来源槐角中槐角苷的含量。方法:Luna 5u C18(2)100A柱(250 mm×4.60 mm,5μm),柱温为35℃,流动相为甲醇-乙腈-1%冰醋酸(40:5:55),流速为1.0 ml/min,检测波长为260 nm。结果:槐角苷质量浓度在14.58 mg/L～53.46 mg/L范围内呈良好的线性关系,回归方程为y=110353x-274717(r=0.9999),平均回收率为99.5%,RSD为1.27%;不同来源槐角中槐角苷含量范围4.27%～8.78%。结论:该方法简便、快速、灵敏、可靠;不同来源的槐角中槐角苷含量有较大差异,其中以陕北黄土高原品种含量最高,可为槐角的质量保证提供依据。     

HPLC测定海风藤药材中海风藤酮的含量

建立了HPLC法测定海风藤药材中海风藤酮含量的方法,采用Hypersil ODS2柱(4.6×250mm,5μm),甲醇-水(70∶30)为流动相,流速为1.0mL/min;检测波长280nm;海风藤酮在116~1160μg/mL范围内线性关系良好,回归方程为Y=4561.1X-10927(r=0.9994),平均回收率为99.83%,RSD=1.08%(n=6)。用本方法测得海风藤酮在风藤、石南藤和山蒟中的含量分别为0.25%,0.0057%和0.0014%。     

HPLC法测定直立白薇中对羟基苯乙酮和2,4-二羟基苯乙酮的含量

建立了中药直立白薇中对羟基苯乙酮和2,4-二羟基苯乙酮的HPLC含量测定方法。色谱条件为:ZOR-BAXSB-C18(4.6mm×250mm,5μm),流动相甲醇:0.1%醋酸水溶液(35:65),流速1.0mL/min,检测波长275nm。对羟基苯乙酮在1.04～104.00μg/mL范围内线性关系良好(r=0.9999),2,4-二羟基苯乙酮在0.25～25.00μg/mL范围内线性关系良好(r=0.9999),其平均加样回收率分别为95.40%和93.28%,RSD分别为3.71%和1.63%。本方法操作简便,结果可靠,重现性好,为白薇的质量标准研究提供了实验依据。     

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.     

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     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

Entwicklungsgeschichte und Ultrastruktur von Pollenkitt und Exine bei nahe verwandten entomophilen und anemophilen Angiospermensippen derAlismataceae,Liliaceae, Juncaceae,Cyperaceae, Poaceae undAraceae

Some closely related members of the monocotyledonous familiesAlismataceae, Liliaceae, Juncaceae, Cyperaceae, Poaceae andAraceae with variable modes of pollination (insect- and wind-pollination) were studied in relation to the ultrastructure of pollenkitt and exine (amount, consistency and distribution of pollenkitt on the surface of pollen grains). The character syndromes of pollen cementing in entomophilous, anemophilous and intermediate (ambophilous or amphiphilous) monocotyledons are the same in principal as in dicotyledons. Comparing present with former results one can summarize: 1) The pollenkitt is always produced in the same manner by the anther tapetum in all angiosperm sub-classes. 2) The variable stickiness of entomophilous and anemophilous pollen always depends on the particular distribution and consistency of the pollenkitt, but not its amount on the pollen surface. 3) The mostly dry and powdery pollen of anemophilous plants always contains a variable amount of inactive pollenkitt in its exine cavities. 4) A step-by step change of the pollen cementing syndrome can be observed from entomophily towards anemophily. 5) From the omnipresence of pollenkitt in all wind-pollinated angiosperms studied one can conclude that the ancestors of anemophilous angiosperms probably have been zoophilous (i.e. entomophilous) throughout.

     

Identification and Characterization of the First Equine Parainfluenza Virus 5

正Dear Editor,Parainfluenza virus 5 (PIV5), known as canine parainfluenza virus in the veterinary field, is a negative-sense,nonsegmented, single-stranded RNA virus belonging to the Paramyxoviridae family (Chen 2018). The virus was first reported in primary monkey kidney cells in 1954 (Hsiung1972), then it has been frequently discovered in various