高效液相色谱法测定布洛芬与羟丙基-β-环糊精的包合作用

利用相溶解度曲线研究不同浓度的羟丙基-β-环糊精(HP-β-CD)与布洛芬(BF)的超分子相互作用。采用高效液相色谱法(HPLC)建立布洛芬的标准工作曲线。配制系列浓度的HP-β-CD溶液,加入过量的布洛芬,采用HPLC法测定布洛芬的溶解度,绘制相溶解度图。结果显示,HP-β-CD与布洛芬的相溶解度曲线为线性关系,说明两者之间包合模型为AL型,布洛芬与HP-β-CD以1∶1包合,其包合常数K为7.23×10~3 L/mol。羟丙基-β-环糊精对布洛芬形成的超分子化合物均有较好的增溶作用。     

高效液相色谱法测定布洛芬与羟丙基-β-环糊精的包合作用

利用相溶解度曲线研究不同浓度的羟丙基-β-环糊精(HP-β-CD)与布洛芬(BF)的超分子相互作用。采用高效液相色谱法(HPLC)建立布洛芬的标准工作曲线。配制系列浓度的HP-β-CD溶液,加入过量的布洛芬,采用HPLC法测定布洛芬的溶解度,绘制相溶解度图。结果显示,HP-β-CD与布洛芬的相溶解度曲线为线性关系,说明两者之间包合模型为AL型,布洛芬与HP-β-CD以1∶1包合,其包合常数K为7.23×10³ L/mol。羟丙基-β-环糊精对布洛芬形成的超分子化合物均有较好的增溶作用。     

呋塞米-羟丙基-β-环糊精包合物的制备及增溶效果评价

采用包合法制备呋塞米与羟丙基-β-环糊精(HP-β-CD)包合物并对其包合常数等进行测定。配制HP-β-CD溶液,加入过量呋塞米制备包合物,使用红外光谱法和薄层色谱法对包合物进行鉴定,通过相溶解度法对HP-β-CD与呋塞米的相互作用进行考察。结果表明,相溶解度曲线为线性关系,表明两者之间为AL型包合,包合比例1∶1。包合常数随温度升高而增大。37℃、HP-β-CD浓度为0.486 5 mol/L时,呋塞米的增溶倍数可高达32.10倍。采用HP-β-CD包合法,可显著改善呋塞米的溶解性,为呋塞米新剂型的开发提供依据。     

呋塞米-羟丙基-β-环糊精包合物的制备及增溶效果评价

采用包合法制备呋塞米与羟丙基-β-环糊精(HP-β-CD)包合物并对其包合常数等进行测定。配制HP-β-CD溶液,加入过量呋塞米制备包合物,使用红外光谱法和薄层色谱法对包合物进行鉴定,通过相溶解度法对HP-β-CD与呋塞米的相互作用进行考察。结果表明,相溶解度曲线为线性关系,表明两者之间为AL型包合,包合比例1∶1。包合常数随温度升高而增大。37℃、HP-β-CD浓度为0.486 5 mol/L时,呋塞米的增溶倍数可高达32.10倍。采用HP-β-CD包合法,可显著改善呋塞米的溶解性,为呋塞米新剂型的开发提供依据。     

羟丙基-β-环糊精对β-(3,5-二叔丁基-4-羟基苯基)丙酰肼的包合及增溶作用研究

为了提高β-(3,5-二叔丁基-4-羟基苯基)丙酰肼(3,5-丙酰肼)的水溶性,采用饱和水溶液法制备了3,5-丙酰肼-羟丙基-β-环糊精包合物(包合物),并通过TLC、IR和DSC等分析手段对包合物进行鉴定。利用紫外分光光度法考察了羟丙基-β-环糊精(HP-β-CD)和3,5-丙酰肼的投料摩尔比对包合效果的影响及HP-β-CD对3,5-丙酰肼的增溶作用。结果表明,随HP-β-CD与3,5-丙酰肼投料摩尔比的增大,所得包合物中3,5-丙酰肼的含量减小,包合物产率和3,5-丙酰肼的包合率均有所增大。当HP-β-CD与3,5-丙酰肼的投料摩尔比为3∶1时,包合物产率和3,5-丙酰肼的包合率均为100%,达到最优包合效果。经HP-β-CD包合后,3,5-丙酰肼的水溶性得到显著提高,由不溶于水变为可溶于水。当HP-β-CD与3,5-丙酰肼投料摩尔比为1∶1时,包合物的溶解度最高,可达9.0 g/100 g水。     

青藤碱与羟丙基-β-环糊精的包合作用研究

通过溶液共混法制备青藤碱-羟丙基-β-环糊精包合物,纯化后利用体视显微镜观察包合物的结晶形态,通过差热示重扫描、红外光谱、X射线粉末衍射及核磁共振等方式对包合物进行性质分析,并通过相溶解度法计算包合物的包合常数。结果表明青藤碱-羟丙基-β-环糊精包合物性质发生明显变化,羟丙基-β-环糊精能显著增加青藤碱的溶解度,青藤碱-羟丙基-β-环糊精包合物是一种稳定的新物质,青藤碱与HP-β-CD形成的包合物的包合分子比为1∶1,其包合常数为150.0。     

β-环糊精及其衍生物对烯酰吗啉的包合作用

[目的]研究β-环糊精及其衍生物对烯酰吗啉的包合作用。[方法]以β-环糊精(β-CD)、羟丙基-β-环糊精(HP-β-CD)、甲基-β-环糊精(Me-β-CD)为主体,制备烯酰吗啉的包合物,通过粉末X射线衍射、热重分析、差示扫描量热法等方法研究环糊精与烯酰吗啉的主客体作用。[结果]β-CD、HP-β-CD及Me-β-CD与烯酰吗啉形成了包合比1∶1的包合物,包合常数分别为910、749、1211 M-1。烯酰吗啉在水中的溶解度及稳定性均得到提高。[结论]研究结果将拓宽烯酰吗啉剂型的开发和应用方向。     

阿司匹林羟丙基-β-环糊精包合物的制备

以羟丙基-β-环糊精(HP-β-CD)为包合材料,制备阿司匹林包合物,以解决阿司匹林水溶性差、易水解的问题,并减轻其口服给药对胃肠道的刺激性.以阿司匹林包合率为评价指标衡量包合效果,筛选包合物的制备方法,优化包合工艺,通过T LC、DSC等分析方法对包合物进行评价.结果表明,制备阿司匹林HP-β-CD包合物的最佳方法为...     

高效液相色谱手性流动相添加法分离氟比洛芬对映体及其分离机制

以羟丙基-β-环糊精(HP-β-CD)为手性流动相添加剂,研究了氟比洛芬对映体在反相高效液相色谱中的拆分。考察了羟丙基-β-环糊精的浓度、流动相pH值、有机调节剂、柱温对手性分离的影响,同时探讨了HP-β-CD对氟比洛芬对映体在反相高效液相中的分离机制且计算出相应的包结常数。确定了色谱条件:YMC-Pack ODS-A C18(150 mm×4.6 mm,5μm)色谱柱,流动相为0.5%乙酸(pH3.5,三乙胺调节)含25 mmol/L羟丙基-β-环糊精:甲醇(80:20,v/v),流速为1.0 mL/min,柱温为30℃,紫外检测波长为247 nm。通过容量因子(k’)的倒数1/k’对[HP-β-CD]的良好的线性关系证明氟比洛芬与HP-β-CD形成包结比为1:1包结物,(+)-氟比洛芬的包结常数为1.83 L/mol,(-)-氟比洛芬的包结常数为1.67 L/mol。     

HPLC手性流动相添加剂法拆分盐酸美西律对映体

以羟丙基-β-环糊精(HP-β-CD)作为手性流动相添加剂,于C18柱高效液相色谱建立了盐酸美西律对映体的拆分方法.方法:本文选用ODS Hypersil柱(4.6 mm×200 mm,4.5μm),以羟丙基-β-环糊精(HP-β-CD)作为手性流动相添加剂,流动相:乙腈-水(30:70,v/v),其中含17mmol·L-1HP-β-CD.pH值为6.32,流速0.20mL·min-1;紫外检测波长:261nm;进样量:10μL.考察了流动相种类、pH值和手性流动相添加剂浓度等因素对手性拆分的影响.结果:建立了羟丙基-β-环糊精手性流动相添加剂法拆分盐酸美西律对映体的方法.结论:此方法简便、快速,分离度好.     

青藤碱与羟丙基-β-环糊精的包合作用

通过溶液共混法制备青藤碱-羟丙基-β-环糊精包合物,纯化后利用体视显微镜观察包合物的结晶形态,通过差热示重扫描、红外光谱、X射线粉末衍射及核磁共振波谱等方法对包合物进行性质分析,并通过相溶解度法计算包合物的包合常数。结果表明,青藤碱、羟丙基-β-环糊精包合后性质发生明显变化,羟丙基-β-环糊精能显著增加青藤碱的溶解度,包合物中青藤碱与羟丙基-β-环糊精包合分子个数比为1∶1,其包合常数为150.0 L/mol,反应的吉布斯自由能为-12.41 kJ/mol。     

槲皮素包合物的研究进展

综述了国内外槲皮素包合物的研究概况。为了改善槲皮素的水溶性,人们把槲皮素与环糊精及其衍生物制成包合物。如槲皮素与β-环糊精(β-CD)、α-环糊精(α-CD)、部分甲基化-β-环糊精(M-β-CD)、羟甲基-β-环糊精(HP-β-CD)、硫代丁基-β-环糊精(SBE-β-CD)等制成包合物,使槲皮素的水溶性明显提高,更有利于在体内的吸收,提高了生物利用率。     

Preparation of itraconazole/HP-β-CD inclusion complexes using supercritical aerosol solvent extraction system and their dissolution characteristics

The purpose of this study was to investigate the feasibility of a supercritical fluid process, called aerosol solvent extraction system (ASES), for producing solid-state inclusion complexes of itraconazole (ITR) with 2-hydroxypropyl-β-cyclodextrin (HP-β-CD). ITR was complexed with HP-β-CD at temperatures of 35–55 °C, pressures of 83–140 bar, CO₂ densities of 0.498–0.801 g/cm³, and solution concentrations of 1–5% (w/v). The ASES-processed inclusion complex powders were observed to consist of agglomerates of very fine (100–500 nm) particles. From the experimental results of X-ray diffraction and differential scanning calorimetry, it was found that ITR intermolecularly interacted with the HP-β-CD cavity, resulting in the formation of inclusion complex. Furthermore, the ASES-processed ITR/HP-β-CD powders showed a significant enhancement in the ITR solubility (up to 753.6 μg/mL) in an aqueous medium of pH 1.2. The aqueous solubility of ITR increased with pressure at a constant temperature, and we could obtain a relatively high solubility of 341 μg/mL at 140 bar and 35 °C. In a solution concentration range of 1–5% (w/v), the solubility increased with decreasing concentration, yielding 289–407 μg/mL. When the molar ratio of ITR to HP-β-CD was varied from 1:1 to 1:3, the ITR solubility increased with HP-β-CD content, giving a value of 753.6 μg/mL for the 1:3 ratio. For the ASES-processed ITR/HP-β-CD powders, the percent dissolution of ITR also increased considerably and about 90% of ITR was dissolved within 5–10 min.     

Effect of 2-Hydroxypropyl-β-cyclodextrin on Solubility of Sparingly Soluble Drug Derivatives of Anthranilic Acid

Guest-host complex formation of three drug derivatives of anthranilic acid, mefenamic acid, niflumic acid, and flufenamic acid with 2-hydroxypropyl-β-cyclodextrin (2HP-β-CD) in aqueous solutions was investigated using "Phase solubility study" with UV-vis spectrophotometry. Solubility of sparingly soluble drugs has been improved by addition of 2HP-β-CD at two temperatures 298.15 K and 310.15 K and two pH values 2 and 7. The influence of different 2HP-β-CD concentration on solubility of drugs at different pH and temperatures has been investigated. The 2HP-β-CD-drug complex stability constants (K(s)), and dissociations constants (K(d)), as well as the thermodynamic parameters of reaction, i.e., the free energy change (ΔG), the enthalpy change (ΔH) and the entropy change (ΔS), were determined. The experimental data indicated formation of 1:1 inclusion complexes, which were found effective binders increasing the solubility of drugs.     

羟丙基-β-环糊精及β-环糊精与十六烷基三甲基溴化铵混合体系的电导研究

用电导法研究了十六烷基三甲基溴化铵 (CTMAB)与羟丙基 β 环糊精 (HP β CD)及 β 环糊精 (β CD)混合体系的电导行为。结果表明 ,由于CTMAB与HP β CD或 β CD间形成了包合物 ,使体系电导率增加的幅度减缓。当体系中HP β CD或 β CD的浓度增加时 ,CTMAB的临界胶束浓度 (CMC)增加 ,即转折点后移 ,且HP β CD对CTMAB的CMC转折点后移的影响较 β CD明显     

Determination of Kinetics in Biphasic Recognition Chiral Extraction for Separation of Phenylsuccinic Acid Enantiomers

This paper reports on the determination of the intrinsic kinetics in biphasic recognition chiral extraction of phenylsuccinic acid enantiomers (H₂A) by L-IBTA and HP-β-CD in a modified Lewis cell. The two-phase homogeneous reaction model was selected, because there is a finite physical solubility of phenylsuccinic acid enantiomers in both the aqueous phase and the organic phase. The regime analysis was split up in three parts: a regime analysis on the aqueous phase reaction in the absence of organic phase reaction, a regime analysis of the organic phase reaction in the absence of the aqueous phase reaction, and a regime analysis of reactions in both phases. The reactions have been found to be first order with respect to H₂A and second order with respect to L-IBTA and HP-β-CD. Competitive extraction of H₂A enantiomers with HP-β-CD and L-IBTA has great influence on the extraction process. With increase of HP-β-CD concentration, high enantioselectivity was obtained, but the extraction rate decreases.     

以b-环糊精、2-羟丙基-b-环糊精和4-乙烯吡啶为功能单体制备氟比洛芬分子印迹聚合物及其吸附特征

以b-环糊精(β-CD)、2-羟丙基-β-环糊精(HP-β-CD)和4-乙烯吡啶(4-VP)为功能单体,以氟比洛芬为模板分子,以环氧氯丙烷和乙二醇二甲基丙烯酸酯为交联剂,采用本体聚合法制备分子印迹聚合物(MIPs),对氟比洛芬与功能单体的相互作用和MIPs的结构进行了表征,比较了3种MIPs对氟比洛芬的吸附性能. 结果表明,β-CD, HP-β-CD和4-VP与氟比洛芬之间以较强的相互作用形成复合物,通过交联、聚合形成聚合物,以HP-β-CD作功能单体所得聚合物印迹效果最佳,具有较强的特异性吸附能力,印迹因子和特异性吸附率分别为1.79和38.92%,分子印迹机制是β-CD的锥筒包结作用和羟丙基的亲和作用形成印迹空穴.     

双相（O/W）识别手性萃取分离多巴对映体研究

为了研究多巴在D（L）-2酒石酸异丁酯1,2二氯乙烷有机相和羟丙基-β-环糊精水相萃取体系中的分配行为;运用双相（O/W）识别手性萃取,考察酒石酸构型和浓度、羟丙基-β-环糊精浓度、水相pH值等因素对萃取性能的影响。羟丙基-β-环糊精对S-多巴对映体的识别能力大于对R-多巴对映体的识别能力,而L-酒石酸异丁酯的识别能力刚好相反;在羟丙基-β-环糊精和L-酒石酸异丁酯萃取体系中,多巴外消旋体一次萃取分离后R和S对映体的分配系数（kR和kS）分别为8.92和5.34,分离因子α达1.67;同时pH值和萃取剂浓度对手性分离能力有显著的影响。双相（O/W）识别手性萃取具有较强的手性分离能力,它对外消旋体化合物的制备性分离有着十分重要的意义。     

Reaction kinetics in reactive extraction for chiral separation of α-cyclohexyl-mandelic acid enantiomers with hydroxypropyl-β-cyclodextrin

This paper reports on determination of the intrinsic reaction kinetics in reactive extraction of α-cyclohexyl-mandelic acid (α-CHMA) enantiomers with hydroxypropyl-β-cyclodextrin (HP-β-CD) in a modified Lewis cell, in which HP-β-CD dissolved in 0.1 mol/l NaH₂PO₄/H₃PO₄ buffer solution was selected as chiral extractant. α-CHMA enantiomers were extracted from an organic phase to an aqueous phase in the extraction module. The theory of extraction accompanied by chemical reactions has been used to obtain the intrinsic kinetics of this extraction module. The different factors affecting the extraction rate, such as agitation speed, interfacial area, initial enantiomers concentration in an organic phase as well as HP-β-CD concentration in an aqueous phase were separately studied. The experimental results demonstrate that the extraction reaction kinetics is fast. The reactions between α-CHMA enantiomers and HP-β-CD in a stirred cell fall in regime 3 and are first order with respect to α-CHMA enantiomers and second order with respect to HP-β-CD with forward rate constants of 6.9×10⁻² m⁶/(mol² s) and 2.5×10⁻² m⁶/(mol² s) for S-α-CHMA and R-α-CHMA, respectively. These data will be useful in the design of the extraction process.     

羟丙基-β-环糊精萃取苯基琥珀酸的动力学特性

为研究β-环糊精衍生物类萃取剂萃取芳香酸对映体的动力学行为,以苯基琥珀酸对映体（PSA）为分离溶质,羟丙基-β-环糊精（HP-β-CD）为萃取剂,采用恒界面池法考察了搅拌速率、两相接触面积、萃取剂和溶质浓度等操作参数对苯基琥珀酸对映体萃取动力学的影响。实验结果表明：HP-β-CD萃取PSA为准一级反应萃取过程;且萃取发生在相界面,萃取速率随PSA的初始浓度的增大而增大,且呈线性关系。