两类β—环糊精衍生物固定相上溶质的色谱保留行为和热力学性质

合成的２，３，６－Ｏ－三丁基－β－环糊精和２，６－Ｏ－二丁基－３－三氟乙酰基－β－环糊精是新颖的选择性固定相，十二组芳香族化合物异构体，正构醇，邻苯二甲酸二酯以及正构烷烃等系列化合物在用以上两种固定液涂渍的弹性石英毛细管柱上得到很好的分离。     

非甾体抗炎药对映体在多糖衍生物手性固定相上的拆分

在共价键合多糖类衍生物的手性固定相(Chiralpak IA,Chiralpak IB,Chiralpak IC)和涂敷型多糖衍生物的手性固定相(Chiralpak AD,Chiralcel OD)上,对非甾体抗炎药物(non-steroidal anti-inflammatory drugs,NSAIDs)进行了对映体拆分.色谱条件:流动相为10%异丙醇/正己烷(V/V)含0.1%三氟乙酸(Chiralpak AD,2%异丙醇/正己烷(V/V)含0.1%三氟乙酸(Chiralpak OD),异丙醇(四氢呋喃、乙酸乙酯、二氯甲烷)/正己烷/0.1%三氟乙酸(Chiralpak IA,Chiralpak IB,Chiralpak IC);流速为1.0 mL/min;紫外检测波长为254 nm.比较了非甾体抗炎药在直链淀粉-三(3,5-二甲基苯基氨基甲酸酯)衍生的手性固定相Chiralpak IA和 Chiralcel AD,纤维素-三(3,5-二甲基苯基氨基甲酸酯)衍生的手性固定相Chiralpak IB和Chiralcel OD上的对映体拆分.结果表明,非甾体抗炎药在Chiralpak IA和Chiralpak IB上的分离效果普遍低于Chiralpak AD和Chiralcel OD.     

高效液相色谱手性固定相法拆分α—氨基酸衍生物对映体

在纤维素－三（３，５－二甲基苯基氨基甲酸酯）（ＣＤＭＰＣ）手性柱上，凤正己烷－醇为流动相，对３种外消旋氨基酸衍生物（苯乙内酰脲）在正相模式下进行了拆分。考察了流动相中醇链长度、醇的立体结构、醇的含量对手性拆分的影响。首次用三元流动相体系对样品进行了拆分，发现利用三元流动相体系可达到最佳拆分效果。根据试验结果，对样品在ＣＤＭＰＣ－ＣＳＰ手性固定相上的正相手性识别机理进行了讨论。     

L-酒石酸型固定相对映分离氨基酸衍生物

在L-酒石酸衍生的键合网状聚合物HPLC手性固定相上正相拆分了7种氨基酸衍生物,考察了流动相中极性醇添加剂的种类、含量和柱温等对手性拆分效果的影响,结合计算得的热力学函数对手性识别机理进行了探讨。当流动相为正己烷：异丙醇(95：5),流速1mL／min,柱温25℃时,7种底物对映分离效果好,出峰时间均在12min以内。     

复合作用分子烙印手性色谱固定相

采用复合作用力，以Ｎ－ｔｅｒｔ－Ｂｕｔｏｘｙ－Ｃｒｂｏｎｙｌ－Ｌ－Ｔｒｙｐｔｏｐｈａｎ的烙印分子合成了一种对Ｎ－ｔ－Ｂｏｃ－ＤＬ－Ｔｒｙｐｔｏｐｈａｎ具有良好手性拆分作用的高效液相色谱固定相，并初步研究了其拆分其机理。     

氨基酸衍生物对映体的高效液相色谱手性分离

通过在流动相中使用酸性添加剂,在由(S)-N-(2-萘基)丙氨酸衍生而成的手性固定相上直接分离氨基酸的3,5-二硝基苯甲酰衍生物,获得非常理想的分离效果。并在此工作的基础上对手性识别机理进行了初步探讨。另外,通过在不同构型的手性固定相上分离相同的溶质,证明在结构相同、构型相反的手性固定相上,对映体的出峰顺序是相反的。     

α-氨基酸在L-脯氨酸手性配体交换色谱固定相上的分离

合成了L-脯氨酸硅胶键合手性配体交换色谱固定相，并用于α-氨基酸的直接光学分离，详细考察了流动相pH值、金属离子浓度、流速、柱温以及进样量等因素对分离效果的影响，从而进一步优化了色谱分离条件。     

杯芳烃衍生聚合物用作毛细管气相色谱固定相的研究

合成了两种不同构象的杯芳烃衍生聚合物（杯芳冠醚聚硅氧烷ｃ－ｃ［４］ｃ５－ｐｓｏ和二乙氧基杯［４］芳烃聚硅氧烷ｐ－ｃ［４］－ｐｓｏ），并将其用作毛细管气相色谱固定液，使用温度高达３２０℃，对不同的极性化合物，特别是对酚类异构体有很好的分离能力。同时也研究了分离机理。     

气相色谱手性固定相进展

1966年Gil-Av等人首次用手性固定相在毛细管柱上分离了氨基酸对映体。至今这种方法已发展为研究和分离对映体的一种重要技术,并愈来愈多地用于天然产物绝对构象(外激素、香料成分等)的测定,不对称选择合成中对映体纯度及过剩量测定,手性药物中对映体纯度的测定,手性化合物在化学转移机理等方面的研究。目前气相色谱中用于分离对映体的     

Chiral Resolution of Benzophenone Imine Derivatives of Amino Acid Esters on Chiral Stationary Phases

Abstract

A convenient way of resolving the enantiomers of amino acid esters after their derivatization using benzophenone imine is described. The enantiomers of benzophenone Schiff base derivatives of various amino acid ethyl esters are readily separated on three commercially available chiral stationary phases (CSPs). Among them, CSPs 2 and 3 afford generally the base-line enantioresolution for the analytes studied. From understanding of chromatographic results, a plausible chiral recognition mechanism is discussed.     

高效液相色谱手性固定相对氨基酸衍生物对映体分离研究

利用高效液相色谱手性固定相对光学异构体分离分析日益受到人们的重视。高效液相色谱氨基酸酰胺型手性固定相对拆分对映异构体具有较好的效果。本文为了探讨该类手性固定相对氨基酸的拆分影响,用L-异亮氨酸叔丁酰胺型手性固定相,对6种DL氨基酸(丙氨酸、2-氨基-n-丁酸、缬氨酸、亮氨酸、苯丙氨酸和蛋氨酸)的18种衍生物进行了拆分,并讨论了其衍生物取代基对手性拆分的影响及从立体化学角度提出了手性拆分机理。实验结果表明,这种手性固定相对外消旋氨基酸衍生物有较好的拆分能力。 1 实验部分 1.1 仪器和试剂 Varian 2010型高效液相色谱仪(美国);2050型紫外检测器及HP3394型积分仪(美国);L-异亮氨酸叔丁酰胺型手性柱(TBILS,上海药物研究所),粒度10μm,柱长100mm、内径4mm的不锈钢柱。 异丙醇(分析纯)用前重蒸,石油醚(60～90℃)分析纯,重蒸收集69℃镏分,用前全经过0.5μm薄膜并脱气。DL-氨基酸衍生物[丙氨酸(Ala),2-氨基-n-丁酸(Buty),缬氨酸(Val),亮氨酸(Leu),苯丙氨酸(Phe),蛋氨酸(Met)]用相应DL-氨基酸参考文献方法进行N-乙酰化及酯化。衍生物经元素分析合格,配制成5mg/mL溶液。     

Enantioseparation of Amino Acid Derivatives with a Cellulose-Based Chiral Stationary Phase

Five structurally related amino acid derivatives were enantioseparated by HPLC with a commercially available chiral stationary phase, Chiralcel OD-H. The chromatographic experiments were performed in the normal phase mode. n-Hexane/polar alcohol was used as mobile phase. Excellent baseline enantioseparations could be obtained for all these solutes. The effects of the concentration of polar alcohol and the column temperature on the retentions and enantioseparations were studied in detail. From the van't Hoff plots the corresponding apparent thermodynamic parameters were derived. Mechanism aspects of chiral recognition were discussed based on the relationship between the thermodynamic parameters and the structures of the solutes. It was found that the substituent of the phenyl group on the residual group of the amino acid derivatives was close relevant to thermodynamic origin of enantioseparation. Much better enthalpy–entropy compensation effect was obtained by plotting the differential, rather than the original, thermodynamic parameters.     

两种新型杯（4）芳烃衍生物用作毛细管气相色谱固定相的研究

合成了两种新型的杯（４）芳烃衍生物：５－１′，１′－二甲基十一烯氧基苯基甲基－１１，１７，２３－三－１，１－二甲基乙基－２５，２６，２７，２８－四苄氧基杯（４）芳烃Ｃ（４）ＴＢ）及５－１′，１′－二甲基十一烯氧基苯基甲基－１１，１７，２３－三－１′，１′－二甲基－２５，２６，２７，２８－四乙氧羰甲氧基（Ｃ（４）ＴＥＣＭ）其结构经元素分析ＩＲ，＾１ＨＮＭＲ，ＭＳ的数据证实，分别将其与ＯＶ－１７０１固     

Chiral Separations by Capillary Electrochromatography on Multiple-Interaction Based Stationary Phases

Summary The direct resolution of neutral amino acid and amino alcohol derivatives by pressurized capillary electrochromatography (p-CEC) is reported. Separations were performed on columns packed with multiple-interaction based chiral stationary phases (CSPs) in reversed-phase mode, using borate buffer/acetonitrile mixtures as the eluent. Two CSPs were used: 3,5-dinitrobenzoyl-(R)-phenylglycine (DNB-PGLY)- and 3,5-dinitrobenzoyl-(R)-naphthylglycine (DNB-NGLY)-silica bonded, respectively. Baseline separations of N-benzoyl--naphthylamide derivatives of phenylalanine and leucine were accomplished on DNB-PGLY-CSP in less than three minutes, and on DNB-NGLY-CSP within about 3.5 minutes, with a comparable efficiency of 160.000 plates per meter. As expected, DNB-NGLY-CSP showed higher selectivity for the compounds under study. The R-isomer eluted before the S-isomer on both CSPs. The effect of the buffer pH on the efficiency of the columns was also studied. With buffer pH over the values of 8–8.5, free residual -aminopropyl groups on the silica particles seemed do affect neither selectivity nor resolution. At these mobile phase conditions calculated efficiency against electroosmotic flow plot is consistent with that generally obtained in CEC, providing a reduced plate height of about 1.8 at a linear velocity of 0.5 mm s^–1. With buffer pH values under 7.0, protonation of the free aminopropyl groups strongly affected the resolution with the result of higher retention and lower solute mass transfer.     

Reversed-Phase Liquid Chromatographic Separation, on Cellulose Chiral Stationary Phases, of the Stereoisomers of Methoxytetra-hydronaphthalene Derivatives, New Agonist and Antagonist Ligands for Melatonin Receptors

A stereoselective high-performance liquid chromatographic method has been established for chiral separation of melatoninergic derivatives with one or two chiral centers, new agonist and antagonist ligands for melatonin receptors. Reversed-phase separations were performed on cellulose-based chiral stationary phases—tris-3,5-dimethylphenylcarbamate (Chiralcel OD-RH) or tris-methylbenzoate (Chiralcel OJ-R). Water–modifier (methanol or acetonitrile) mixtures in different proportions were used as mobile phases. The effects of organic mobile-phase modifier concentration, temperature, and compound structure were examined. Baseline separation (R_S > 1.5) was readily obtained for many of the compounds.     

环糊精衍生物气相色谱手性固定相研究进展

评述近年环糊精衍生物气相色谱手性固定相的研究进展,对环糊精衍生物进行分类并总结了近年来其在GC手性分离上的应用,介绍环糊精衍生物的手性分离机制及纯度问题进展,展望环糊精衍生物作GC手性固定相的应用前景。     

Azulene-Modified Polysiloxanes as Gas Chromatographic Stationary Phases: Comparison of the Separatory Properties of Azulene and Naphthalene

Azulene is an aromatic molecule with interesting properties, most notably a permanent dipole moment of 1.08D. This degree of polarity in the absence of heteroatoms is quite rare and offers potential for use in unique gas chromatographic stationary phases. Here, we report the first examples of azulene-derivatized stationary phases for gas chromatographic separations. Poly(dimethyl/azulenylmethyl) siloxane polymers containing 15 and 35% of an azulene derivative were synthesized, coated on capillary columns, and evaluated. To compare the effects of increased polarity vs. the effects of polarizability, isomeric naphthalene analogues were also prepared, coated, and evaluated. The coated phases displayed efficiencies up to 2700 plates/m. For both azulene and naphthalene columns, retention increased as substitution level increased. The more polarizable naphthalene columns tended to retain analytes more strongly. Columns were also evaluated for the separation of several different mixtures of isomers against a commercial HP-5 column. All azulene and naphthalene columns exhibited separations comparable to the commercial column. The solvation thermodynamic parameters phases were measured, showing an excellent linear relationship and no change in the mechanism of interaction over the temperature range measured.     

手性酰胺聚硅氧烷固定相的制备与气相色谱性能

以L-苯丙氨酸,L-缬氨酸为手性源,合成了二种含末端烯基,具有刚性苯基链节的新型手性酰胺单体;并通过硅氢加成方法将其接枝到含氢硅油上,制备了两种新型手性酰胺聚硅氧烷固定相.这一新方法具有简单易行,各步产率较高的优点,所制备的手性固定相具有较好的毛细管柱色谱性能.手性拆分能力和耐温性.