pH区带逆流色谱研究进展

综述了近年来pH区带逆流色谱（pH-zone-refining ccc)在分析，半制备和制备分离氨基酸，多肽，氧杂葱染料，生物碱，异构体等领域的研究和应用进展。     

高速逆流色谱在化工分离中的应用

高速逆流色谱是近年发展起来的,不使用固定相载体的新型液液逆流色谱.本文介绍了高速逆流色谱的工作原理,综述了高速逆流色谱在天然产物、蛋白质和抗生素物质尤其在传统中药有效成分制备和精制上的应用,介绍两相溶剂体系选择的基本原则,展望了高速逆流色谱与其他检测器联用.     

高速逆流色谱研究进展

综述近几年来高效逆流色谱(HSCCC)的研究进展。总结了应用于HSCCC的两相溶剂体系。并重点列举了近几年来HSCCC应用于天然产物、蛋白质、抗生素等方面的实例。     

近年国内高速逆流色谱分离天然产物的应用

高速逆流色谱(HSCCC)是一种快速高效的分离方法。综述了近五年来关于HSCCC分离天然产物的研究进展,详细的论述了常用溶剂体系适合分离物质的特征,列举了大量的应用实例和被分离物质的结构及分配系数,对其分离提取天然产物有效成分的应用及其进展进行了综述,对快速选择溶剂体系起到了一定的指导作用。并对HSCCC的未来发展进行展望。     

异戊酰螺旋霉素高速逆流色谱中的溶剂体系

可利霉素是转基因工程菌发酵所得的一种多组分抗生素药物,分离纯化其作为主要组分的各异戊酰螺旋霉素对药物分析及药理研究具有重要意义.高速逆流色谱作为一种基于液液分配原理的新型分离技术,可用于异戊酰螺旋霉素的分离制备.文中通过测定不同溶剂体系中目标物的分配系数,筛选适合分离制备异戊酰螺旋霉素的溶剂体系.以正己烷-乙酸乙酯-乙...     

逆流色谱技术在国内茶叶天然产物中的研究及应用

茶叶中天然产物成分多,其中生物碱、茶多酚、茶黄素等在医学、饮料、保健品等行业具有广泛应用。逆流色谱由于操作简单、分离效果较好、适合制备性分离等特点,成为分离提取茶叶天然产物的一种方法。本文就近几年国内运用逆流色谱分离提取茶叶天然产物所取得的进展进行综述。     

逆流色谱在外消旋体分离中的应用

本文全面深入地综述了逆流色谱拆分消旋体的原理和特点,阐述了手性选择剂和溶剂系统选择在逆流色谱分离消旋体中的重要性,详细总结了手性选择剂和溶剂系统具有发展潜力的研究新进展。     

高速逆流色谱在农药杂质分离中的应用

[方法]利用高速逆流色谱,选用不同的溶剂体系,分别对氟虫腈、氟环唑、咪草烟、氟吗啉原药中的特定杂质进行了分离提纯.[结果]在对应的溶剂体系下,分离得到的杂质纯度均超过90％.达到了杂质定性及定量分析的要求.[结论]HSCCC是一种高效的杂质分离方法.     

高速逆流色谱技术在天然产物分离中的应用

高速逆流色谱(HSCCC)是广泛应用于天然产物分离制备的新型色谱技术。介绍了高速逆流色谱特点和溶剂选择的方法,综述了HSCCC在天然产物中的应用和研究现状,对高速逆流色谱技术的前景进行了展望。     

高速逆流色谱在手性拆分中的应用

高速逆流色谱是一种新型的、连续高效的液液分配色谱技术.它的固定相和流动相都是液体,没有不可逆吸附,具有样品无损失、无污染、高效、快速和大制备量分离等特点,此项技术已被广泛用于中药成分分离、保健食品、生物化学、生物化工、天然产物化学、有机合成、环境分析等领域.近年来,由于其与传统的分离纯化方法相比有明显的优点,高速逆流色谱技术被逐渐用于手性物质拆分,文章总结了溶剂体系的选择标准,以及目前在高速逆流色谱中进行手性拆分的研究进展.     

Application of Counter-Current Solvent Extraction to the Separation of Naphthalene and Nonionic Surfactants

This study conducted counter-current solvent extraction to investigate the influence of solvent/solution volumetric ratio, solvent flow rate, and surfactant concentration on extraction efficiency. Fitting formulas for predicting the partition coefficients of the contaminant and surfactant between the aqueous and solvent phases were developed to optimize the counter-current solvent extraction. It is found that the solvent/solution volumetric ratio and the surfactant concentration had greater impact than the solvent flow rate on the extraction efficiency. The relationship between the partition coefficient K and the solvent/solution volumetric ratio or surfactant concentration was closely related to power function. Besides, the accuracy of the fitting formulas was consistent with the experimental results.     

Application of High-Speed Counter-Current Chromatography Preparative Separation of Flavone C-Glycosides From Lophatherum gracile

Preparative high-speed counter-current chromatography (HSCCC) was used to separate and purify bioactive constituents from the stems and leaves of Lophatherum gracile Brongn. Six flavone C-glycosides each at over 95% purity including two new compounds were obtained in one-step separation by HSCCC with an optimized two-phase solvent system composed of ethyl acetate-n-butanol-ethanol-water at volume ratio of 4:2:1.5:8.5 (v/v/v/v). The experiment yielded 19.9 mg of luteolin 6-C-β-D-galactopyranosiduronic acid (1→2)-β-D-glucopyranoside (1), 28.5 mg of luteolin 6-C-α-L-arabinopyranosyl-7-O-β-D-glucopyranoside (2), 31.5 mg of isoorientin (3), 44.8 mg of orientin (4), 25.3 mg of swertiajaponin (5) and 12.1 mg of apigenin 6-C-β-D-galactopyranosiduronic acid (1→2)-β-D-glucopyranoside (6) from 500 mg of crude extracts. The purity of these compounds was determined by high-performance liquid chromatography (HPLC). Their chemical structures were identified by electron spray ionization mass spectroscopy (ESI-MS), ¹H and ¹³C nuclear magnetic resonance spectroscopy (NMR).     

发电厂锅炉补给水系统逆流再生离子交换设备的特点与应用

在电力生产过程中,水处理系统至关重要,离子交换器是比较经典的水处理设备。论文就离子交换器中的逆流再生固定床在设计、运行中常见的问题提出了相应的应对方法,希望有益于电厂化学制水系统的安全经济运行。     

Application of High-Speed Counter-Current Chromatography for Isolation and Purification of Paclitaxel and Related Taxanes from Taxus chinensis Cell Culture

Six taxanes were isolated and purified from Taxus chinensis cell culture extract using high-speed counter-current chromatography. The crude cell culture extract was first treated with Al₂O₃ column chromatography and then divided into two parts: fraction 1 and fraction 2. 52 mg of taxuyunnanine C and 11 mg of sinenxane C were yielded from 150 mg of fraction 1. 5 mg of 9-dihydrobaccatin III, 12 mg of baccatin III, 12 mg of paclitaxel, and 17 mg baccatin VI were yielded from 150 mg of fraction 2. The purities of the six compounds were 93.51%, 98.02%, 98.61%, 97.55%, 98.93%, and 98.76%.     

脱臭剂在溶剂油系统上的工业应用

两种脱臭剂DS—1精脱硫剂和HB—2型RSH脱臭剂的特性及其作用机理,以及其在溶剂油系统的工业应用。结果表明,此种脱臭剂的脱臭效果好,脱后硫醇可控制在2×10-6以下,工艺简单,且不影响溶剂油物理化学性质,能满足工业生产的要求,有很大的应用前景。     

Separation of Four Compounds from Forsythia suspensa by Counter-Current Chromatography with Stepwise Elution

High speed counter-current chromatography technique in preparative scale has been successfully applied to separate and purify main compounds from the ethyl acetate extract of Forsythia suspense using stepwise elution with two-phase solvent systems composed of n-hexane-ethyl acetate-methanol-water at (1:4:1:4,v/v) and (1:4:2:3,v/v). Under the optimized conditions, the preparative high-speed counter-current chromatography was performed on 350 mg of the ethyl acetate yielding phillyrin (12.8 mg), isolariciresinol-9’-O-β-D-glucopyranoside (5.3 mg), pinoresinol (21.2 mg), and phillygenin (8.3 mg) in a one-step separation, with purities over 90% as determined by HPLC. The structures of the separated compounds were identified by HPLC-MS and ¹H NMR.     

Separation and Purification of Two Isomeric Saponins from Albiziae Cortex by High-Speed Counter-Current Chromatography and Preparative High-Performance Liquid Chromatography

Following constituents’ enrichment steps with the AB-8 macroporous resin, silica gel, and ODS columns, high-speed counter-current chromatography (HSCCC) and preparative HPLC were successfully used for the isolation and purification of two complex isomeric saponins including a new one from albiziae cortex. The two-phase solvent system used for separation was composed of n -hexane/ n -butanol/water (1:10:5, v/v/v ). A total of 8.2 mg julibroside J _{5 a} and 11.6 mg julibroside J ₅ with purity of higher than 98%, respectively, as determined by HPLC-ELSD were obtained from the constituents enriched fraction (475.4 mg) of albiziae cortex. Their structures were identified by HR-MS, ¹ H NMR ¹³ C NMR, and 2D NMR. This is the first ever report on the separation of complex isomeric saponins from albiziae cortex by HSCCC.     

Acid-Alkali Extraction of Triterpene Acids from Poria and Preparative Separation by High-Speed Counter-Current Chromatography

A method for the acid-alkali extraction and preparative separation of triterpene acids from poria was established. The triterpene acids were enriched and separated into two fractions after extraction at the optimized pH value. The two fractions were subjected to high-speed counter-current chromatography for the preparative separation of triterpene acids, separately. As a result, dehydropachymic acid, pachymic acid, 3-epi-dehydropachymic acid, poricoic acid B, dehydrotumulosic acid, and 3-epi-dehydrotumulosic acid were obtained with purities of 94.1%, 96.2%, 93.5%, 85.9%, 80.1%, and 93.1%, respectively. The structures were identified by ESI-MS, ¹H NMR, and ¹³C NMR.     

Enrichment and Separation of Sinomenine and Acutumine from Sinomenium acutum by pH-Zone-Refining Counter-Current Chromatography

Enrichment and separation of alkaloids from a chloroform extract of Sinomenium acutum has been successfully performed for the first time using pH-zone-refining counter-current chromatography. The two-phase solvent system used for enrichment was composed of Methyl tert-butyl ether (MtBE)–acetonitrile (CH₃CN)–water (4:1:5, v/v), where 10 mM triethylamine (TEA) was added to the upper organic stationary phase as a retainer and 10 mM hydrochloric acid (HCl) to the aqueous mobile phase as an eluter, which could enrich the alkaloids from the crude extract well. For the preparative separation, the solvent system consisted of MtBE–CH₃CN–water (4:0.5:5, v/v) with 10 mM TEA in organic stationary phase and 5 mM HCl in the aqueous mobile phase, which could separate and purify the enriched crude alkaloids successfully. 0.82 g of crude alkaloids was enriched from 1.60 g of chloroform extract in the first step separation. From the enriched crude alkaloids, 376 mg of sinomenine and 85 mg of acutumine were obtained in the second step separation with the purity of 98.1% and 98.7%, respectively. The chemical structures of the isolated compounds were identified by UV, ESI-MS and ¹H NMR.     

蜡溶剂回收系统多效蒸发的工艺模拟和应用

在对一酮苯脱蜡脱油装置蜡溶剂回收系统二效蒸发工艺进行模拟的基础上,进行二效蒸发改三效蒸发的工艺模拟和优化.实施后能耗下降了2.096kg标准油-t进料-1,节能效果明显.