聚N-异丙基丙烯酰胺硅胶键合固定相的制备与评价

以3-巯丙基三甲氧基硅烷为偶联剂,将聚N-异丙基丙烯酰胺(PNIPAM)键合到硅胶上,制得了键合固定相（SI-PNIPAM）填料,并用元素分析、红外光谱等对其进行了表征。以甲醇-水为二元流动相,用多环芳烃、碱性物质对该固定相进行了色谱评价,并考察了该固定相的适用pH范围及水解稳定性。结果表明:该固定相具有较好的色谱性能与温敏特性,并且在pH 2.5～7.5时稳定性良好。     

胺型键合反相固定相的制备及评价

首次将一种新型硅烷偶联剂--β-（3，4-环氧环已基）乙基三甲氧基硅烷（β-ECTS）与辛胺反应，然后再键合到硅胶上，得到了胺型键合固定相，并用元素分析、^13C固体核磁共振、红外光谱进行了表征。以甲醇和水为二元流动相，用包括碱性、酸性和中性有机化合物在内的混合物对该固定相进行评价，并考察了该填料的适用pH范围及水解稳定性。结果表明，该固定相具有较好的色谱性能，且在pH=2-8之间稳定性能良好，可有效地用于碱性化合物的分析分离。     

新型酯型反相高效液相色谱填料的制备,表征及性能评价

将一种新型硅烷偶联剂β－（3，4－环氧环己基）乙基三甲氧基硅烷（β－ECTS）与辛酸反应，然后再键合到硅胶上，得到了酯型键合固定相。用元素分析，^13C固体核磁共振谱，红外光谱进行了表征。以甲醇和水为二元流动相，用包括碱性，酸性和中性有机化合物在内的混合物评价该固定相的疏水性，选择性和亲碱醇基效应，并考察了该填料适用的pH范围及水解稳定性，结果表明，该固定相具有较好的色谱性能，且在pH=2.5-7.5之间稳定性良好，可有效地用于碱性化合物的分析分离。     

聚硅氧烷包夹聚合硅基高效液相色谱固定相的表征及其色谱性能

利用元素分析、红外光谱、扫描电镜及汞压吸附法对制备的聚硅氧烷包夹硅基反相高效液相色谱固定相进行了表征,给出了该固定相的结构信息及其与色谱性能的关系;用滴定法测定了该固定相表面硅羟基数目;考察了该固定相对碱性化合物的分离性能;由表征和色谱性能考察结果可知,该固定相表面的羟基基本被覆盖,因此,可在碱性流动相中长期使用。     

碳十八键合锆胶固定相的制备与色谱性能评价

用诱导聚合胶体凝聚法（PICA）制得的二氧化锆微球与碳十八三乙氧基硅烷反应制备了碳十八键合锆胶固定相（ODZ），评价了该柱填料的色谱性能，并用此固定相分离了中性和碱性化合物。     

新型烷基醚型键合固定相的制备及评价

 首次将一种新型硅烷偶联剂 β (3,4 环氧环己基 )乙基三甲氧基硅烷 (β ECTS)与辛醇反应 ,然后再键合到硅胶上 ,得到了醚型键合固定相 ,并用元素分析、13 C固体核磁、红外光谱等对其进行了表征。以甲醇 水简单的二元流动相体系 ,对该固定相进行了色谱评价。结果表明 ,该固定相具有较好的色谱性能 ,且在 pH 2 5～ 7 5时化学稳定性能良好 ,硅醇基效应得到了很好地抑制 ,可有效地用于碱性化合物的分离分析     

磷酰胆碱色谱固定相的制备及其在分离生物大分子中的应用

以三氯氧磷、氯化胆碱和甲基丙烯酸-2-羟乙酯(HEMA)为原料合成了含磷酰胆碱的单体2-甲基丙烯酰氧乙基磷酰胆碱(MPC). 在硅胶表面嫁接聚合MPC, 得到磷酰胆碱两性离子交换色谱填料. 研究了该填料对标准蛋白的分离性能及pH对蛋白质保留的影响. 结果表明, 该填料对溶菌酶和牛血清白蛋白的动态吸附容量分别为13.8和18.7 mg/g, 其基质磷酰胆碱色谱固定相可同时基线分离两种酸性和两种碱性蛋白.     

L-异亮氨酸键合色谱固定相的制备及其性能

利用异氰酸丙基三乙氧基硅烷与L-异亮氨酸反应合成了一种新型的硅烷偶联剂,并进一步将其与硅胶反应制得键合有L-异亮氨酸的亲水色谱固定相。 通过核磁共振氢谱表明亮氨酸功能化硅烷偶联剂的成功合成、元素分析表征证明亮氨酸已成功键合到硅胶表面。 将其作为亲水模式下的固定相填料填装在150 mm×4.6 mm不锈钢色谱柱中,以一系列经典的极性小分子作为探针,考察了这些探针分子在固定相上的色谱行为。 极性化合物的保留时间随着流动相中有机溶剂含量提高而逐渐增大,表现出典型的亲水保留特征。 进一步研究了流动相中乙腈含量、缓冲盐pH值及缓冲盐浓度等因素对分析物在固定相上的保留的影响。 在优化了相关参数后,将固定相应用于碱性化合物、水溶性维生素以及核苷类极性物质的分离当中。 在等度洗脱下,5种碱性化合物、6种水溶性维生素和8种核苷类物质分别在8、18及25 min内被成功分离。 分离结果表明了合成的L-异亮氨酸键合亲水色谱固定相具有较好的色谱性能,在极性化合物的分离上具有良好的应用前景。     

芘基丁酸键合硅胶固定相对含π电子物质的高效液相色谱分离研究

通过芘基丁酸键合硅胶固定相对含π电子物质的分离研究, 考察了该固定相的色谱性能. 结果表明, 该固定相不仅具有疏水作用和电荷转移性能, 还具有很强的平面识别能力, 可很好地分离烷基苯、 稠环芳烃及取代硝基苯等各种含π电子物质， 且在pH 3.5～7.0 时化学稳定性能良好, 硅醇基效应得到了很好的抑制, 可有效地用于碱性化合物的分离分析.     

1 μm硅胶颗粒固定相的加压电色谱分离性能

制备了1 μm无孔硅胶颗粒。通过电动填充法得到总长度为45 cm(固定相填充长度为20 cm)、内径为100 μm的毛细管色谱柱。以乙腈-水体系作为流动相,详细考察了碱性化合物在该色谱柱上的加压电色谱(pCEC)分离性能,讨论了流动相比例、缓冲液浓度、pH值及操作电压等因素对分离的影响。实验结果表明,裸硅胶柱在乙腈-水体系分离碱性样品中表现出典型的反相色谱分离性能;缓冲液浓度的改变则对分离影响不大。当pH值改变时,碱性化合物的解离程度发生变化,它们与固定相之间的作用力发生变化,使得分离度发生相应的变化。分离柱效随施加电压的增加而增加,在1 kV电压下,裸硅胶柱对邻甲苯胺的柱效为35000理论塔板/m。     

酰胺型键合相的简便制备及评价

 提供了一种酰胺型键合相的简便合成方法 ,即氨丙基三乙氧基硅烷先与烷基酰氯反应 ,然后再键合到硅胶上。该合成路径具有很好的重复性 ,得到的最后产物的硅胶表面键合链均一。用元素分析、核磁共振和红外光谱对最后产物进行了表征。以甲醇和水为二元流动相 ,用包括碱性、酸性和中性有机化合物在内的混合物对该键合相进行了评价 ,并考察了该键合相的适用pH范围及水解稳定性。结果表明 ,该键合相具有较好的性能 ,且在 pH 2 5～ 7 5时稳定性能良好 ,可有效地用于碱性化合物的分析分离。     

新型高效液相色谱酰胺键合固定相的制备与评价

将YWG-80硅胶和3-氨基丙基三甲氧基硅烷反应后与2-壬基丁二酰氯反应制得一种新型双齿酰胺键合固定相(BABSP-2)。采用元素分析和傅里叶变换红外光谱表征了键合相;用芳香族化合物溶质和甲醇-水二元流动相,考察了键合相的疏水选择性和亲硅醇基活性;评估了在酸性条件下(pH2.5)的水解稳定性。结果表明：BABSP-2能有效抑制残留硅醇基活性,并具有可比的疏水选择性和较好的水解稳定性。     

A Bidenate Amide Bonded Stationary Phase for HPLC

A novel bonded stationary phase, bidenate amide bonded stationary phase (BABSP),was prepared by reacting YWG silica gel firstly with 3-aminopropyltrimethoxysilane, then with diacid chloride. Hydrophobicity, selectivity, and especially silanophilic activity of BABSP were evaluated. The stationary phase exhibited good column efficiency and peak shape for separation of some basic solutes.     

Synthesis of a propyldimethylphenylsilane stationary phase using the allyl bonded phase as an intermediate

Summary A propyldimethylphenylsilane stationary phase was prepared by a hydrosilylation reaction on the double bond of an allyl bonded phase intermediate. The carbon load on the silica was between 8.8–9.0%. Evaluation of the material by FTIR indicated high conversion of the double bond by the hydrosilylation reaction. The bonded material displayed reversedphase properties as determined by the retention behavior of alkylarylketones but it was less hydrophobic than either C-8 or C-18. The stability at both low and high pH was excellent. Separations of pharmaceutical compounds, a mixture of anilines, and a mixture of dopamine and epinephrine were satisfactory.     

Preparation and chromatographic evaluation of a chiral stationary phase based on carboxymethyl-β-cyclodextrin for high-performance liquid chromatography

A novel chiral stationary phase (CSP) was prepared by chemically bonding carboxymethyl-β-cyclodextrin (CM-β-CD) onto 3-aminopropyl silica gel and showed excellent enantioseparation abilities for a broad range of chiral compounds and drugs.     

Preparation of a sulfoxide group and ammonium-salt bonded silica stationary phase for separation of polychlorinated biphenyls from mineral oils

In this study, a silica stationary phase modified with sulfoxide group and ammonium-salt was prepared for the separation of polychlorinated biphenyls (PCBs) from mineral oils, and its properties were investigated. Organic sulfide was attached to a diamino (primary and secondary amino) bonded silica surface by an amide bond, and the bonded sulfide groups were oxidized with periodate to afford sulfoxide groups bonded to the stationary phase. The secondary amino groups in the spacer chain were converted to ammonium-salt by the addition of hydrochloric acid. The sulfoxide group and ammonium-salt bonded stationary phase was tested for their suitability as adsorbent for SPE-type preparative short columns and for an analytical HPLC-type separation. The new stationary phase (1.2 mmol of sulfur bonded per gram) separated PCBs from mineral oils (paraffin-based transformer oils) more efficiently than previously reported stationary phases including sulfoxide group or ammonium-salt bonded ones. The quantitative chromatographic parameters for an aliphatic hydrocarbon (eicosane) and some PCB congeners also indicated strong retention of highly chlorinated biphenyls by the sulfoxide and ammonium-salt bonded silica compared with simple aminopropyl, sulfoxide group or ammonium-salt bonded ones. A cleanup procedure was established for simple determination of PCBs in mineral oil samples using sulfoxide group and ammonium-salt bonded silica packed column fractionation. The analytical method, combination of the cleanup procedure, and measurement with a GC-high resolution (magnetic sector) MS or a GC-quadrupole MS were validated using mineral oil certified reference materials.     

Electrochromatographic performance of conventional and polar-embedded C16 silica monolithic stationary phases

A novel monolithic silica column that has a polar‐embedded amide‐secondary amine group linking with C16 functionality for RP‐CEC is described. The amide‐secondary aminealkyloxysilane was synthesized by the reaction of 3‐(2‐aminoethylamino) propyltrimethoxysilane with hexadecanoyl chloride. Then, the silylant agent was bonded to the silica monolith matrix to produce hexadecanamide‐secondary amine bonded silica (HDAIS) monolithic column. The electrochromatographic performance of HDAIS monolithic column for the separation of neutral, basic and polar solutes was studied, which was compared to that using the hexadecyl bonded silica monolithic column. The HDAIS monolithic column displayed reduced hydrophobic retention characteristics in the separation of five hydrophobic n‐alkylbenzenes and four polar phenols when compared to the hexadecyl bonded silica monolithic column. A very much reduced silanol activity of HDAIS monolithic column was observed in the separation of test basic mixture including four aromatic amines, atenolol and metoprolol with 10 mM borate buffer (pH 7.5) containing 30% v/v ACN as the mobile phase. The comparison results indicate good performance for both polar and basic mixtures on HDAIS monolithic column in RP‐CEC, and also show promising results for further applications.     

二氢麦角碱在极性嵌入反相色谱固定相上的分离行为

二氢麦角碱的4种组分具有不同的药效特性,需适当的分析方法对其在不同剂型药品中的含量进行分析.传统液相色谱方法使用强碱性流动相,严重腐蚀硅胶基质色谱填料,影响色谱柱寿命.合成了极性嵌入反相固定相--C18酰胺固定相,并在中性流动相条件下分离4种组分.考察了流动相组成和pH对二氢麦角碱在C18酰胺固定相上保留行为的影响.在150 mm×4.6 mm I.D.的C18酰胺色谱柱上,流动相为乙腈-20 mmol/L Na2HPO4(30:70,V/V,pH 7.0)的条件下实现了4种组分的基线分离.与传统方法相比,极性嵌入反相固定相可以有效的改善碱性化合物的分离特性和大幅度地延长色谱柱的使用寿命.     

Study of the selectivity,retention mechanisms and performance of alternative silica-based stationary phases for separation of ionised solutes in hydrophilic interaction chromatography

The separation of a mixture of neutral, strongly acidic and strongly basic compounds was studied in hydrophilic interaction chromatography using a bare silica phase, and bonded silica phases with diol, zwitterionic, amide and hydrophilic/hydrophobic groups. The mobile phase was acetonitrile–ammonium formate buffer at low pH. Differences in selectivity between these various columns indicate that the stationary phase cannot function merely as an inert support for a water layer into which the solutes partition from the bulk mobile phase. Attempts to fit the retention data to equations which describe either partition or adsorption mechanisms were inconclusive. Ion exchange was a significant contributor to the retention of ionised bases on all columns studied. Van Deemter plots indicated that the efficiency as a function of flow rate varied between the columns, which might be attributable in part to the presence of either monomeric or polymeric bonded phase layers.