锆镁磷脂膜色谱固定相的制备及其在评价药物-膜相互作用中的应用

基于锆基质与磷脂之间强烈的路易斯酸碱作用,制备了锆镁磷脂膜色谱固定相,并使用红外光谱、X射线光电子能谱对该色谱固定相进行了表征;使用与体内环境类似的生理缓冲液体系为流动相,评价了该模拟生物膜色谱固定相预测药物膜渗透性的能力,结果表明药物在锆镁磷脂膜色谱中的保留(log Kmbm)与表观渗透率(log Papp)在预测药物的膜渗透性、跨膜吸收等方面具有非常好的相关性,相关系数为0.970,斜率接近1。通过理论推导,引入了直观、方便的热力学指标吉布斯自由能差值（Δ(ΔG°)）对药物-膜之间的相互作用强弱进行了评价。     

脱叔丁基杯[8]芳烃键合固定相的制备及其液相色谱性能

杯芳烃(Cahixarenes)是一类由苯酚单元经亚甲基相连而成的大环化合物,与β-环糊精类似,它能与多种溶质形成主客体包容配合物,并通过超分子作用识别离子和中性分子等客体,利用杯芳烃的分子识别作用可提高色谱分离性能,Glennon等制备了酯化杯[4,6]芳烃键合固定相,     

光声喇曼光谱的理论分析

对光声喇曼光谱(PARS)作了系统的理论分析,分别导出固体和液体介质中的光声喇曼光谱的信号表达式,并进行了数值估算。 关键词：     

Solvent and concentration effects on the properties of electrospun poly(ethylene terephthalate) nanofiber mats

This study describes the preparation and characterization of nanofibrous mats obtained by electrospinning poly(ethylene terephthalate) (PET) solutions in trifluoroacetic acid/dichloromethane (TFA/DCM). Special attention was paid to the effect of polymer concentration and solvent properties on the morphology, structure, and mechanical and thermal properties of the electrospun nonwovens. The results show that the spinnable concentration of PET solution in TFA/DCM solvents is above 10 wt %. Mats have nanofibrous morphology with fibers having an average diameter in the range of 200–700 nm (depending on polymer concentration and solvent composition) and an interconnected pore structure. Higher solution concentration favors the formation of uniform fibers without beads and with higher diameter. Morphology and fiber assembly changed with the solvent properties. Solvent mixtures rich in TFA, i.e., those with higher dielectric constant and lower surface tension, originated fibers with small diameter. However, due to the lower volatility, those solvent mixtures also produced more branched and crosslinking fibers, with less morphologic uniformity. Mechanical properties (Young's modulus, ultimate strength, and elongation at break) and thermal properties (glass transition, crystallization, and melting) have been studied for the PET electrospun nanomats and compared with those of the original polymer. Solvent effect on fiber crystallinity was not significant, but a complex effect was observed on the mechanical properties of the electrospun mats, as a consequence of the different structural organization of the fibers within the mat network. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 460–471, 2008     

香豆素类化合物的一种新合成方法

香豆素类化合物是一类重要的有生物活性的天然产物,也可用作香料、阻凝剂和三线态光敏剂。用 Meldrum 酸合成该类化合物,已有一些报道。我们在研究 Meldrum 酸系列     

十二烯基丁二酸改性氧化锆色谱固定相性能研究

本文用十二烯基丁二酸（DSA）改性氧化锆得到一种新的锆基质色谱固定相。改性前后的红外光谱的差异表明，DSA以两个羧基与氧化锆结合，由于多位点结合方式提高了固定相的稳定性，因此固定相可以在碱性（pH8．5）条件下稳定使用。锆基质色谱固定相具有较强的疏水性，用于中性及碱性化合物的分离取得了满意的结果。     

龙爪芦荟和库拉索芦荟中微量锗的测定与红外光谱区别

采用吸光光度法对龙爪芦荟和库拉索芦荟中的微量锗进行了测定,并探讨了两种芦荟的红外光谱的区别。结果表明,龙爪芦荟中含锗量在26.1～28.6μg·g-1,回收率为91.6%～97 5%。库拉索芦荟中含锗量在16.8～20.0μg·g-1,回收率为87.1%～94.5%。两种芦荟的FT IR光谱图在2100cm-1处有明显差异,由此可区别两种芦荟。     

微波促进的N-取代2,3,3a,4,7,7a-六氢异吲哚-1,3-二酮的Beller法合成

A rapid and facile synthesis of N-substituted 2,3,3a,4,7,7a-hexahydroisoindole-l,3-dione derivatives via microwave-promoted Beller three-component domino reaction of α,β,-unsaturated aldehydes, amides and N-substituted maleimides was described.     

On Mixed Pressure-Velocity Regularity Criteria to the Navier-stokes Equations in Lorentz Spaces,Part Ⅱ:The Non-slip Boundary Value Problem

This paper is a continuation of the authors recent work [Beir?o da Veiga, H.and Yang, J., On mixed pressure-velocity regularity criteria to the Navier-Stokes equations in Lorentz spaces, Chin. Ann. Math., 42(1), 2021, 1–16], in which mixed pressure-velocity criteria in Lorentz spaces for Leray-Hopf weak solutions of the three-dimensional NavierStokes equations, in the whole space R~3 and in the periodic torus T~3, are established. The purpose of the present work is to extend the result of mentio...