乙醇注入法制备木犀草素脂质体

探讨乙醇注入法制备木犀草素脂质体的制备工艺.采用乙醇注入法制备木犀草素脂质体,微柱离心和HPLC法测定包封率,激光粒度仪测定粒径.运用正交实验设计L9(34)优选最佳处方为:磷脂600 mg,药脂比1∶7,类酯比8∶1,有机相水相比1∶1,包封率79.3%,形态,稳定性良好.注入法制备木犀草素脂质体工艺简单,制得剂型稳定,方法可行.     

单宁酸磷脂复合物的制备及其理化性质研究

以单宁酸和大豆卵磷脂为原料制备单宁酸磷脂复合物.以单宁酸与磷脂的复合率为评价标准,通过单因素实验考察反应温度、反应时间、反应物初始质量浓度和投料比例对复合率的影响,由正交试验得到最优条件.研究了单宁酸磷脂复合物的理化性质及溶解性能.结果表明,单宁酸磷脂复合物的最佳制备工艺为:以乙醇为反应溶剂,反应温度为60℃,反应时间为1.5 h,单宁酸质量浓度为4mg/m L,投料质量比例为2∶1.红外光谱和紫外光谱分析表明,单宁酸与磷脂未形成新的化合物而是通过分子间作用力形成的复合物.与单宁酸相比,复合物在水中溶解度有所降低,但在正辛醇中溶解性有明显改善.     

聚溴甲酚绿/碳量子点修饰电极测定木犀草素

采用循环伏安法分步聚合碳量子点和溴甲酚绿,制备聚溴甲酚绿/碳量子点修饰玻碳电极(PBG/CQDs/GCE),研究木犀草素在该修饰电极表面的电化学行为.实验结果表明,该修饰电极对木犀草素的氧化还原反应具有较强的电催化作用.在最佳实验条件下,氧化峰电流与木犀草素浓度在0.010～15.0 μmol·L~(-1)范围内呈良好的线性关系,检测限为4.0 nmol·L~(-1).使用该方法对中药胶囊中木犀草素含量进行测定的结果与高效液相色谱法结果一致.     

流动注射化学发光法测定木犀草素

在酸性条件下,木犀草素与Ce(Ⅳ)反应产生化学发光,罗丹明6G可以增强其化学发光,据此建立了一种简便、快速测定木犀草素的化学发光分析新方法．在优化的实验条件下,化学发光强度在5．0×10-8～2．0×10-6g／mL 范围内与木犀草素的浓度呈现良好的线性关系．根据IUPAC的建议,计算得到的检测限(3σ)为1．0×10-8g／mL, 对1．0×10-6g／mL的木犀草素进行11次平行测定,其相对标准偏差为0．87％．将本法用于血样和尿样中木犀草素的测定,结果令人满意．     

木犀草素与木犀草苷的抗炎活性对比研究

研究并比较木犀草素及其糖苷木犀草苷的抗炎活性.角叉菜胶所致大鼠足跖肿胀,醋酸致小鼠腹腔毛细血管通透性增加等体内实验表明木犀草素及木犀草苷具有一定的抗炎活性.木犀草素5 mg/kg组在1 h时对角叉菜胶所致大鼠足跖肿胀具有一定的抑制作用,而木犀草苷无明显的抑制作用;木犀草素20 mg/kg组对醋酸致小鼠腹腔毛细血管通透性增加有显著抑制作用,且作用强度优于木犀草苷20 mg/kg组.进一步以脂多糖(LPS)诱导的小鼠巨噬细胞RAW 264.7细胞株为炎症反应模型,采用MTT法、Griess法、Western blot法考察木犀草素和木犀草苷的抗炎活性并对比二者之间的活性差异.结果显示,木犀草素对LPS诱导RAW 264.7产生炎症介质NO和炎性蛋白iNOS、COX-2蛋白高表达表现出明显的抑制作用;木犀草苷对LPS诱导RAW 264.7细胞iNOS蛋白高表达具有抑制作用,以上实验结果表明木犀草素和木犀草苷具有显著抗炎活性,且木犀草素的抗炎活性在一定程度上优于木犀草苷.     

木犀草素固体脂质颗粒包封率测定及抗氧化研究

测定木犀草素固体脂质颗粒的包封率并对其抗氧化能力进行研究,为木犀草素固体脂质颗粒的进一步开发应用提供依据.低速离心法分离木犀草素固体脂质颗粒与游离木犀草素,紫外分光光度法测定木犀草素固体脂质颗粒中木犀草素的质量比;通过对羟自由基、超氧阴离子、DPPH·清除能力和还原力的测定,确定木犀草素固体脂质颗粒的抗氧化能力.当离心强度1 000 r/min,离心时间120 s时,可实现较好的分离效果,并测得3批包封率分别为74.41%、76.41%、74.24%;以Vc作对比,木犀草素和木犀草素固体脂质颗粒对DPPH·、·OH和O_2~-·三种自由基的清除能力均随样品质量浓度的增加而升高.本实验测定包封率的方法操作简单快捷,可用于测定木犀草素固体脂质颗粒的包封率;木犀草素固体脂质颗粒提高了木犀草素的抗氧化活性,具有潜在应用价值.     

木犀草素在电沉积石墨烯修饰电极上的电化学研究及测定

将正己基吡啶六氟磷酸盐与石墨粉混合制备一种离子液体修饰碳糊电极,用电化学还原的方法将氧化石墨烯沉积于该电极表面得到电化学沉积石墨烯修饰电极.通过循环伏安法和示差脉冲伏安法研究了木犀草素在该修饰电极上的电化学行为.在p H为2.0的磷酸缓冲液中对木犀草素溶液进行循环伏安扫描,出现了一对良好的氧化还原峰,考察了扫速和p H等条件对电化学反应的影响.在最佳条件下木犀草素的浓度在4.0×10-8mol/L~4.0×10-6mol/L之间与氧化峰电流呈良好的线性关系,检测限为1.0×10-8mol/L.     

木犀草素的药理作用及制剂研究进展

木犀草素(Luteolin)是一种黄酮类化合物,具有抗炎、抗菌、抗肿瘤、抗氧化和抗病毒等多种药理作用.近年来,对木犀草素制剂的开发研究逐渐增多,固体分散体、纳米制剂、金属离子配合物以及包合物等制剂技术的应用,不仅提高了木犀草素的生物利用度,还促进了中药现代化制剂研究的发展.本文对木犀草素的药理作用及其制剂的最新研究进展进行综述,为后续相关研究提供参考.     

木犀草素在钯-石墨烯复合材料修饰电极上的电化学测定

用正己基吡啶六氟磷酸盐作为粘合剂制备了离子液体修饰碳糊电极(CILE),将钯-石墨烯(Pd-GR)复合材料修饰于CILE表面制得修饰电极(Pd-GR/CILE),并利用循环伏安法和示差脉冲伏安法(DPV)对木犀草素在该修饰电极上的电化学行为进行研究.结果表明在pH 1.5的磷酸盐缓冲溶液中木犀草素在该电极上循环伏安扫描得一对峰形良好的氧化还原峰,说明木犀草素的电化学反应得以实现.在优化条件下木犀草素的氧化峰电流与其浓度在1.0×10~(-9)~1.0×10~(-6)mol/L内存在线性关系,检测限为3.3×10~(-10)mol/L(3σ).利用本方法测定独一味胶囊中木犀草素的含量,回收率在95.6%~104.8%范围内,相对标准偏差(RSD)低于3.43%.     

微波法制备木犀草素

报道了在碱性水溶液中,利用微波辐射,以保险粉（Na2S2O4）还原芦丁制备木犀草素的反应。采用功率为250 W条件下,加热回流1 h（20 min×3）,收率67%。与已知方法相比,本法原料易得,操作简单,工艺稳定,反应时间短,收率较好。同时,对微波加热的机制和优点进行了分析和总结。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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