纤维素键合型手性固定相分离二氢吡啶类钙离子拮抗剂药物对映体

目的采用HPLC手性固定相法拆分6种二氢吡啶类钙离子拮抗剂药物对映体。方法采用Chiralpak IC[纤维素-三(3,5二氯苯基氨基甲酸酯)共价键合硅胶]手性色谱柱,考察了流动相中有机改性剂的种类和比例、碱性添加剂、柱温及流速对对映体分离的影响。结果最终确定分离尼莫地平的最优条件为正己烷-正丙醇(体积比90∶10);分离西尼地平的最优条件为正己烷-正丙醇(体积比85∶15);分离尼索地平、阿折地平的最优条件为正己烷-正丙醇-二乙胺(体积比92∶8∶0. 01);分离阿雷地平的最优条件为正己烷-正丙醇-二乙胺(体积比90∶10∶0. 01);分离贝尼地平的最优条件为正己烷-正丙醇-二乙胺(体积比95∶5∶0. 01);柱温为25℃,流速为1. 0 mL·min~(-1)。以上6种化合物均可在Chiralpak IC手性固定相上得到完全分离。且热力学研究结果表明尼莫地平、西尼地平、阿折地平、贝尼地平对映体的手性拆分过程均受焓驱动影响,低温有利于对映体分离。而阿雷地平、尼索地平既受焓驱动,同时也受熵驱动影响。结论该纤维素键合型手性固定相对以上6种二氢吡啶类化合物表现出良好的对映体选择性。     

非洛地平和尼莫地平对映体的手性拆分研究

目的:建立二氢吡啶类钙拮抗剂非洛地平和尼莫地平对映体的手性分离方法。方法:在Pirkle型Whelk-O1手性柱上分别考察在流动相正己烷中,不同的醇类添加剂及碱性添加剂对手性分离的影响。结果:当流动相为正己烷-乙醇-二乙胺(85∶15∶0.1,v/v/v),流速0.5 mL·min-1,温度25℃时非洛地平和尼莫地平分离度R分别为1.77和1.45。结论:本法操作简便,可用于非洛地平和尼莫地平对映体的分离分析。     

西酞普兰中间体在纤维素键合手性固定相上的拆分

目的:建立西酞普兰中间体(CTD)手性对映体的高效液相色谱分析方法,用于测定不同分离过程所得产品的光学纯度。方法:采用Chiralpak IC(250 mm×4.6 mm,5μm)键合型手性柱,流速1.0 mL.min-1,柱温25℃,系统考察了以正己烷为主体的标准流动相和四氢呋喃、甲基叔丁基醚、二氯甲烷等非标准流动相体系中CTD对映体的分离效果;在优选的2种流动相中进一步考察了柱温对分离的影响以及系统适用性。结果:优选的标准流动相正己烷-正丙醇-三乙胺(80∶20∶0.1,v/v)中CTD对映体的分离度为9.04;非标准流动相正己烷-二氯甲烷-乙醇-二乙胺(50∶50∶2∶0.1,v/v)中CTD对映体的分离度为10.22,S-(-)-CTD先于R-(+)-CTD出峰。结论:CTD对映体在优选的流动相中分析时间短、分离度高、系统适用性好,所建立的分析方法高效、快速,重现性好,可用于西酞普兰中间体的光学纯度测定。     

顶空气相色谱法测定阿折地平中有机溶剂残留量

目的 建立阿折地平中6种有机溶剂残留量的分离测定方法。方法 采样顶空进样毛细管气相色谱法,程序升温,二甲亚砜为溶解递质。色谱柱为NUKOLTM毛细管柱,载气为氮气,FID检测器,测定了阿折地平原料中正己烷、四氢呋喃、醋酸乙酯、甲醇、二氯甲烷、乙腈的残留量。结果 6种有机溶剂完全分离,在所考察的浓度范围内具有良好线性,r值0.996 1～0.999 7,平均回收率87.6%～105.1%,精密度RSD<5%。结论 该方法灵敏,准确,适用于阿折地平中有机溶剂残留量的检测.     

纤维素键合手性固定相分离托吡卡胺等4种抗胆碱能药物对映体

目的在正相色谱条件下建立了托吡卡胺、氢溴酸后马托品、硫酸阿托品和山莨菪碱共4种阿托品类药物的对映体分离方法。方法使用Chiralpak IC[纤维素-三(3,5-二氯苯基氨基甲酸酯)共价键合硅胶]手性色谱柱,考察了不同流动相体系、烷醇体积比、酸碱添加剂、柱温以及流速对对映体分离的影响。结果 4种药物均可达到良好的分离度,通过不断优化色谱分离条件最终确定分离4种药物的最佳流动相条件:柱温为25℃,流速为1.0 m L·min-1,分离托吡卡胺对映体的流动相为正己烷-乙醇-二乙胺(体积比70∶30∶0.05),分离氢溴酸后马托品和硫酸阿托品对映体的流动相为正己烷-乙醇-二乙胺(体积比80∶20∶0.05),在最佳条件下3种药物对映体之间的分离度分别为7.73、2.36和2.67。分离山莨菪碱4个对映体的最佳流动相为正己烷-异丙醇-乙酸-二乙胺(体积比70∶30∶0.05∶0.025)。结论纤维素键合手性固定相对除山莨菪碱以外的3种抗胆碱能药物均能达到完全分离。     

键合型直链淀粉手性固定相分离5种质子泵抑制剂对映体

目的使用HPLC手性固定相法实现5种质子泵抑制剂对映体的分离。方法考察手性固定相种类,流动相中有机改性剂的种类和比例,缓冲盐的种类和浓度,碱性添加剂,流速及柱温等因素对分离的影响。结果通过不断优化色谱分离条件,最终确定5种药物的分离条件:色谱柱为Chiralpak ID柱(250 mm×4.6 mm,5μm),柱温为25℃,流速为0.6 mL·min~(-1),分离泮托拉唑、雷贝拉唑对映体的流动相为水-乙腈(60∶40,v/v),分离奥美拉唑对映体的流动相为水-乙醇(20∶80,v/v),分离兰索拉唑对映体的流动相为5 mmol·L~(-1)醋酸铵水溶液-乙腈(60∶40,v/v),分离艾普拉唑对映体的流动相为20 mmol·L~(-1)碳酸氢铵水溶液-乙腈(55∶45,v/v)。在上述条件下,5种质子泵抑制剂对映体均达到完全分离。结论键合型直链淀粉手性固定相对5种质子泵抑制剂对映体均实现完全分离。     

LC-MS/MS法测定人血浆中阿折地平的浓度

目的:建立测定人血浆中阿折地平浓度的方法。方法:人血浆样本经乙腈沉淀蛋白后采用液相色谱-串联质谱(LC-MS/MS)法进样测定,色谱柱为Zorbax Eclipse XDB-C18,流动相为甲醇-10 mmol/L乙酸铵(含1%甲酸)(80∶20,V/V)。选用多重反应监测扫描方式进行质谱监测,监测离子反应分别为m/z 583.3→167.1(阿折地平)、m/z 285.1→154.0(内标地西泮)。结果:阿折地平的血药浓度在0.05~40 ng/ml范围内线性关系良好,定量下限为0.05 ng/ml。日内、日间RSD分别为3.01%~7.75%,0.99%~12.08%;平均提取回收率为110.20%~111.99%。结论:该方法简便、快速、灵敏、专属性强、重现性好,适用于人血浆中阿折地平浓度的测定。     

萘普生对映体的手性分离和纯度检查

目的:建立萘普生手性分离和光学纯度检查的高效液相色谱方法。方法:采用Chiralpak AD-H(4.6 mm×250 mm,5μm,Daicel公司)手性色谱柱在正相条件下拆分萘普生对映体,考察了固定相种类、流动相组成、柱温及流速等对萘普生对映体分离的影响,流动相为正己烷-异丙醇(30∶70,v/v),检测波长272 nm,流速0.5 mL.min-1,柱温20℃。结果:在此条件下,萘普生及其(R)-(-)-构型体达到基线分离,分离度为3.3。结论:该法简单快速,重现性好,能够用于萘普生对映体的分离和纯度考察。     

HPLC-UV法测定广东王不留行中槲皮素含量(英文)

本文首次建立了广东王不留行活性成分水解后槲皮素的含量测定方法,为评价广东王不留行的质量和制定其质量标准提供依据。采用HPLC-UV法,以C18反相色谱柱,甲醇–0.4%(v/v)磷酸溶液(50:50,v/v)为流动相等度洗脱,检测波长为360nm。对11批广东王不留行样品进行测定,实验证明该含量测定方法分离效果好、灵敏度高、重复性好,平均回收率为99%,可作为广东王不留行的质量控制方法。     

胸腺肽注射剂反相HPLC特征图谱研究

目的:建立多组分胸腺肽注射剂的反相HPLC特征图谱。方法:采用反相HPLC/UV法分离胸腺肽注射剂的主要成分。色谱柱为Shimadzu Shim-pack XR-ODS(100 mm×3.0 mm,2.2μm);以流动相A:0.1%(v/v)三氟醋酸水溶液,流动相B:0.085%(v/v)三氟醋酸乙腈溶液-0.1%(v/v)三氟醋酸水溶液(80:20),进行梯度洗脱,流速0.5 mL.min-1;检测波长为280nm。用中药色谱指纹图谱相似度评价系统软件对所得色谱特征图谱进行评价。结果:同企业样品的特征图谱与均谱的相似度多数保持在0.9以上,批间一致性良好;不同企业产品的特征图谱与均谱的相似度较低。结论:所建立的反相HPLC方法具有较强的分离能力,线性、精密度良好,为胸腺肽注射剂的质量控制提供了有效的方法。     

HPLC法拆分氟比洛芬对映体

建立氟比洛芬手性药物的高效液相色谱拆分方法。方法:手性流动相添加剂HPLC法:利用C18柱,以羟丙基-β-环糊精作为手性流动相添加剂,调节有机修饰剂甲醇的比例和添加不同量的三乙胺对氟比洛芬进行拆分;手性固定相HPLC法:利用Chiral-pakAD手性柱,以正己烷-乙腈为流动相基本成分,调整两者不同比例和添加不同量的三乙胺,对氟比洛芬进行拆分。结果:手性流动相添加剂法:使用C18柱对氟比洛芬对映异构体进行拆分,调节流动相中有机修饰剂甲醇浓度、手性流动相添加剂羟丙基环糊精浓度、峰型修饰剂三乙胺的浓度等都不能使氟比洛芬对映体达到基线分离,只能部分分离。手性固定相法:氟比洛芬对映体在Chiral-pakAD手性柱上能达到较好的分离。在正己烷-乙腈流动相系统中,正己烷体积含量为90%,三乙胺体积含量为0.05%的条件下,氟比洛芬对映体得到了较好的分离,分离度为10.0。结论:建立的手性固定相法能有效拆分氟比洛芬对映体而手性流动相添加剂法不能拆分氟比洛芬对映体。     

Enantiomeric separation of glutethimide derivatives using a Ceramospher RU-2 column

The enantiomeric resolution of p-acetylaminoglutethimide and p-nitroglutethimide was achieved on a Ceramospher RU-2 column using methanol as the mobile phase. The flow rates of the mobile phase were 1.0 and 0.5 mL/min for p-acetylaminoglutethimide and p-nitroglutethimide, respectively, with UV detection at 254 nm. The values of alpha of the resolved enantiomers of p-acetylaminoglutethimide and p-nitroglutethimide were 1.63 and 1.24 while the values of Rs were 1.44 and 0.86 respectively. The possible chiral mechanism was the formation of transient diastereomeric intermediates between the enantiomers and the chiral selector (1,10-phenanthroline) ruthenium II complex which was stabilized by pi-pi interactions.     

Enantioselective determination of chlorpheniramine in various formulations by HPLC using carboxymethyl-β-cyclodextrin as a chiral additive

A chiral mobile phase HPLC method is described for chiral separation and determination of chlorpheniramine (CP) enantiomers in various commercial preparations. Chromatographic separation was achieved on a conventional ODS column with a mixture of aqueous sodium phosphate (5 mM) containing 0.5 mM carboxymethyl-β-cyclodextrin, methanol and triethylamine (73:25:2, v/v/v, pH 4.3) as the mobile phase. The flow rate of isocratic elution was 0.24 mL/min and peaks were detected at 224 nm. The method was applied to nine commercial CP preparations in six dosage forms and CP enantiomers were well separated without any disturbance of other ingredients or impurities present. The results showed that only one preparation was d-CP and the others were dl-CP preparations. The contents of all the preparations were found to be in the range of 97%–104% of labeled contents. This method was economical and convenient, affording sufficient accuracy, precision and reproducibility, as well as sensitivity and selectivity.     

超临界流体色谱拆分齐留通对映体

目的研究超临界流体色谱对齐留通对映体的分离效果。方法考察确定5种手性柱中分离效果最佳的柱子,在该柱上考察改性剂的种类、浓度、温度及背压对分离度的影响。结果采用Chiralpak AD-H柱、改性剂为异丙醇,异丙醇在流动相中比例为18%、背压为140 bar、温度为303 K时,齐留通对映体达到最佳分离,分离度为11.5,出峰时间分别为4.59、7.35min。结论所用超临界流体色谱的方法简单、快捷、经济有效,适用于齐留通对映体的分离。     

Diastereomeric and enantiomeric high-performance liquid chromatographic separation of synthetic anisodamine

In order to investigate the enantiomeric pharmacokinetics and biotransformation of synthetic anisodamine (654-2), a cholinoceptor antagonist widely used in clinic in China, it has been preparatively separated into two racemates (I and II) by using ZORBAX Eclipse XDB-C18 column. The diastereo- and/or enantioseparations of 654-2, I and II were carried out by HPLC using CHIRALPAK AD-H as chiral stationary phase (CSP) and acetonitrile-2-propanol-DEA 97:3:0.1 (v/v/v) as mobile phase. The methods were optimized by studying mobile phase modifiers, concentration of modifier and column temperature. The HPLC method for the simultaneous separation of two pairs of enantiomers of 654-2 has been validated.     

柱前衍生化高效液相色谱法分离分析奥美拉唑对映体

目的 建立柱前衍生化高效液相色谱法分离奥美拉唑对映体.方法 以(S)-(+)-樟脑磺酰氯为柱前手性衍生化试剂,衍生物在Diamonsil C18色谱柱上,以10 mmol·L-1醋酸铵(pH 7.5)-异丙醇(75:25,v/v)为流动相分离,流速为0.5 mL· min-1.结果 奥美拉唑衍生物可达到基线分离,分离度为1.72.结论 采用柱前衍生化高效液相色谱法,在普通C18色谱柱上分离奥分析美拉唑衍生物,为此类手性药物的分离分析提供一个新方法.     

Enantioseparation of the antidepressant reboxetine

The enantioseparation of reboxetine by HPLC was investigated using chiral stationary phases (CSPs) containing cellulose Tris(3,5-dimethylphenyl)carbamate on silica gel (Chiralcel OD column) as the chiral selector. Reversed phase HPLC was the technique of choice for the analytical enantioseparation of reboxetine, while the chiral semipreparative separation was obtained with the same CSP, but in normal phase conditions. The effects of the mobile phase pH and composition on analytical retention, enantioselectivity and resolution were investigated. The best performance was obtained using a mobile phase composed of 0.5M sodium perchlorate at pH 6 and acetonitrile in the 60/40 (v/v) ratio. The semipreparative separation has allowed obtaining pure enantiomers, but required the preparation of reboxetine free base. Different n-hexane/alcohol mixtures were tested as mobile phases, varying both the nature of the alcohol and its percentage in the mobile phase. Different n-hexane/alcohol mixtures were tested as mobile phase and the best results were obtained by using a mobile phase composed of n-hexane and 2-propanol (80:20, v/v).     

Degradation and configurational changes of thioridazine 2-sulfoxide

Thioridazine (THD) is a phenothiazine neuroleptic drug used for the treatment of psychiatric disorders. After oral administration THD is extensively biotransformed to thioridazine 2-sulfone (THD 2-SO(2)), thioridazine 5-sulfoxide (THD 5-SO) and thioridazine 2-sulfoxide (THD 2-SO). THD 2-SO and THD 5-SO have two chiral centres and therefore exist as two diastereoisomeric pairs. The degradation and epimerization of THD 2-SO in human plasma, buffer and methanolic solutions were studied using an enantioselective HPLC method. The samples were prepared by liquid-liquid extraction with diethyl ether and the chiral resolution of the enantiomers was carried out on a Chiralpak AD column using a mobile phase consisting of hexane:ethanol:2-propanol (90:7:3, v/v/v) containing 0.2% diethylamine. The method was validated and used to study the degradation and epimerization under different conditions of incubation. Our results showed that both enantiomers were stable at varying temperatures, pH and ionic strengths; however, solubility problems were observed, mainly at pH 8.5. The influence of light on stability was studied using methanolic solutions and degradation and epimerization of the THD 2-SO enantiomers were observed under UV light of 366 and 254nm, respectively.     

HPLC on Chiralcel OJ-R for Enantiomer Separation and Analysis of Ketoprofen,from Horse Plasma,as the 9-Aminophenanthrene Derivative*

Racemic ketoprofen is a non-steroidal anti-inflammatory drug used to treat musculoskeletal and colic conditions in horses. The enantioselective chiral inversion of ketoprofen administered to horses has been studied by use of cellulose tris(4-methylbenzoate), also known as Chiralcel OJ-R, as chiral stationary phase; acetonitrile ? 0·02 m perchlorate buffer (pH 2·0) - methanol, 60:15:25 (v/v/v) was used as mobile phase. Before chromatography, to effect adequate chiral interaction with the chiral stationary phase ketoprofen was derivatized with 9-aminophenanthrene, under acid conditions, after solid-phase (C₁₈) extraction and then liquid–liquid extraction, to ensure effective removal of endogenous plasma materials. The 9-aminophenanthrene derivative of S-ibuprofen was used as internal standard. The enantiomers of ketoprofen were separated to baseline (Rs = 6·44, α = 1·76) within a short analysis time. The results indicate that the bio-inversion of R-ketoprofen to the S isomer is significant in equine species. However, considerable differences in pharmacokinetic parameters were observed, indicating large inter-animal variation.     

纤维素三醋酸酯手性固定相分离药物对映体

用非均相乙酰化方法合成微晶纤维素三醋酸酯制备手性柱和手性薄层板用于HPLC和TLC,用95%乙醇或95%乙醇和缓冲液(pH10)的混合物为流动相分离特罗格尔碱、甲喹酮、氯美扎酮和氯喹对映体,讨论了流动相组成、pH、温度对分离对映体的影响。实验结果表明CTA手性板对流动相的组成和pH的变化较敏感,TLC流动相极性一般较HPLC流动相的极性大。上述4种对映体的HPLC分离度均达到0.6以上;TLC分离度均达到1.1以上。