青蒿素脂质体的制备及性能研究

目的:通过对青蒿素脂质体的处方和制备工艺研究,研制高包封率和稳定的脂质体。方法:采用乙醇注入法制备脂质体,以正交实验优化处方,测定了脂质体中药物的包封率,并初步考察了脂质体的稳定性。结果:优化处方与工艺所得脂质体形态均匀,包封率大于85%,载药量达27.22%,粒径约为90 nm,Zeta电位约为-68.4 mV,具有良好的稳定性。结论:乙醇注入法制备脂质体工艺简便,包封率高,制备的脂质体稳定好。     

溶菌酶脂质体的制备及其对生物膜的剥离作用

采用逆向蒸发法制备了稳定的溶菌酶脂质体.在不锈钢表面培养出稳定生物膜后,分别利用溶菌酶和溶菌酶脂质体对其进行剥离.运用Zeta电位仪、扫描电子显微镜(SEM)和红外光谱(FT-IR)对脂质体和生物膜进行表征.结果表明制备的脂质体平均粒径为80~100 nm,包封率为82.4%.相同浓度下溶菌酶及其脂质体对混合菌种形成的生物膜剥离效率分别达到62.4%和86.5%.溶菌酶脂质体在24h内对生物膜和水体中微生物去除率分别达到89.6%和99.6%.因此,溶菌酶脂质体能够有效控制不锈钢表面生物膜污染风险.     

菊苣酸脂质体制备工艺研究

研究菊苣酸脂质体的最佳制备工艺。采用薄膜分散-超声法制备菊苣酸脂质体,以包封率为评价指标,采用Box-Behnken design响应面优化法优化制备工艺参数。结果显示最佳制备工艺为：磷脂与胆固醇的质量比为4.20:1,磷脂与药物的质量比为11.44:1,超声时间为6.54 min,采用最优工艺制备的脂质体包封率为75.18%。采用Box Behnken design响应面法优选出了最佳制备工艺,所得工艺合理可行。     

更昔洛韦脂质体的制备及稳定性考察

采用逆相蒸发法制备更昔洛韦脂质体,同时对所制脂质体进行了表征和稳定性分析.采用透射电镜观察其形态;采用激光粒度仪测定平均粒径;用葡聚糖凝胶层析柱分离含药脂质体和游离药物并测定包封率;用离心加速试验及室温冷藏法考察脂质体的稳定性.结果表明,得到的更昔洛韦脂质体的平均粒径为332.3 nm,多相分散系数为0.143,包封率为43.24%,在考察时间段内,所制脂质体稳定性良好.     

氟比洛芬脂质体的制备及其载药性能研究

利用薄膜蒸发-超声分散法制备氟比洛芬脂质体,通过鱼精蛋白凝聚法测定脂质体对氟比洛芬的包封率和载药率,研究了氟比洛芬脂质体载药性能的影响因素.结果表明,制得的氟比洛芬脂质体的粒径为100～250 nm,具有良好的分散性;氟比洛芬定位于脂质体的疏水基团区域,它在卵磷脂相和水相中的分配系数KD为815.6.当卵磷脂浓度为5.4×10-4mol.L-1时,所得脂质体对氟比洛芬的包封率和载药率比较理想;随着氟比洛芬与卵磷脂的质量比的增加,脂质体对氟比洛芬的载药率增大,包封率降低;胆固醇可以调节脂质体膜的稳定性,胆固醇与卵磷脂的质量比应该控制在0.3以下,过高浓度的胆固醇会大量插入膜内使得膜的刚性增强,导致脂质体对氟比洛芬的载药率和包封率降低.     

脂质体转移因子的制备及其活性研究

以转移因子为包裹对象，探讨提高脂质体肽类药物的包封率和减缓渗漏率的方法和条件，以及制备过程对活性的影响。采用逆相蒸发法制备、以正交试验设计筛选最佳配方组合，制备负电荷脂质体转移因子。通过巨噬细胞吞噬试验和E-玫瑰花结试验比较不同剂型、不同给药途径对小鼠免疫功能的影响。结果表明：负电荷脂质体转移因子包封率和稳定性均比其他文献报道的有较大的提高，包封率5次平均达43%，30d渗漏率12%，具有一定的稳定性；E-玫瑰花结试验显示：制备过程对转移因子活性无显著影响；巨噬细胞吞噬试验表明：不论注射或口服脂质体转移因子，均有提高机体免疫功能的作用，脂质体转移因子的药效优于游离转移因子。     

茶多酚前体脂质体的制备及稳定性研究

采用冷冻干燥法制备茶多酚前体脂质体,并对其稳定性进行研究。通过考察冷冻保护剂的种类、冷冻保护剂的用量、预冻时间、冷冻干燥时间等因素对茶多酚前体脂质体复水后包封率的影响。在最佳制备工艺条件下:海藻糖为冷冻保护剂,海藻糖与卵磷脂的质量比为4∶1,预冻时间为6h,冷冻干燥时间为36h,制备得到的茶多酚前体脂质体复水后包封率45.5%,稳定性高。该法制备的茶多酚前体脂质体包封率高,稳定性好,可以长时间贮藏。     

禽流感病毒核酸疫苗脂质体的研究

:用逆相法、脂膜法制得了禽流感病毒血凝素 (HA)基因重组质粒pSVH7DNA(核酸疫苗 )脂质体 ;用荧光法测定了质粒DNA脂质体的包封率 ,两种方法所得脂质体的包封率分别为 15 .5 8± 1.5 5 % ,6.0 8±0 .3 5 % ,当在磷脂成份中加入阳离子十八胺时 ,脂质体的包封率分别为 70 .4 1± 6.4 9% ,4 6.5 6± 1.92 % 磷脂浓度和离子强度均能影响脂质体的包封率 ,前者能增加包封率 ,而后者使其减少 电镜结果表明 ,两种方法所得的脂质体为单室或多室球形脂质体混合物 ,其粒径大小分别为 163nm和 2 3 5nm     

盐酸小檗碱脂质体的制备工艺研究

采用薄膜蒸发法制备盐酸小檗碱脂质体,紫外分光光度———透析法测定脂质体包封率;以盐酸小檗碱脂质体包封率为指标,考察影响脂质体包封率的各因素.结果表明,制备盐酸小檗碱脂质体的最佳条件为孵化温度60℃,孵化时间30 m in,胆固醇3.3 mg.mL-1,此时包封率达到最高,且脂质体的包封率随着卵磷脂浓度的增加呈线性增加.     

乙醇注入法制备司帕沙星脂质体

制备司帕沙星脂质体,单因素考察优化了制备工艺和处方,以提高脂质体的包封率.采用乙醇注入高压均质法制备了司帕沙星脂质体,以透析高效液相色谱法测定了含量和包封率.实验结果表明,司帕沙星脂质体的平均粒径为22.1nm,包封率为47%左右.乙醇注入高压均质法适用于制备司帕沙星脂质体,透析高效液相色谱法操作简单、准确、重复性好,可用于测定司帕沙星脂质体的含量和包封率.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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