Preparative isolation and purification of 12,13-dihydroxyeuparin from Radix Eupatorii Chinensis by high-speed counter-current chromatography

An efficient method for the isolation and purification of 12,13-dihydroxyeuparin from Radix Eupatorii Chinensis by high speed counter-current chromatography (HSCCC) was established in this paper. The ether extracts of Radix Eupatorii Chinensis were purified by HSCCC with a solvent system of hexyl hydride-ethyl acetate-methanol-water (1:2:1:2, v/v/v/v). The upper phase was used as the stationary phase and the lower phase as the mobile phase. About 8.4 mg of 12, 13-dihydroxyeuparin was obtained from 200 mg of ether extracts from Radix Eupatorii Chinensis in one-step HSCCC separation, with the purity of 96.71%, as determined by HPLC. After methanol- water recrystallization, the purity of 12,13-dihydroxyeuparin reached 99.83%. Such a simple and effective method was fairly useful to prepare pure compound as reference substances for related study on Radix Eupatorii Chinensis.

Preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus by high-speed counter-current chromatography

A high-speed counter-current chromatography （HSCCC） method was successfully developed for the preparative separation and purification of deoxyschizandrin from Schisandrae Sphenantherae Fructus in one step. The purity of deoxyschizandrin was 98.5%, and the structure was identified by MS, UV and NMR. This method was simple, fast, convenient and appropriate to prepare pure compound as reference substances for related research on Schisandrae Sphenantherae Fmctus.

An Economical Method for Preparative Purification of Five Alkaloids from Coptis Chinensis Franch by High-Speed Counter-Current Chromatography Using Singled Prepared Solvent System by GC

Coptis chinensis Franch, a widely used Traditional Chinese Medicine, shows various kinds of bioactivity. The major active components of the herb are considered to be alkaloids. Thus, preparative separation of these alkaloids is critical important for further pharmacology and mechanism studies. In the paper, five alkaloids from C. chinensis were purified by HSCCC using the solvent system composed of chloro-form-metha- nol-water (2:1:1, v/v/v) single prepared. The content of each solvent in solvent system were determined by gas chromatography (GC), then according the ratios of solvents in each phase to prepare the mobile and stationary phase respectively. And a comparative study was carried out between together preparation and single preparation of the solvent system. The purities and recoveries of all the products were over 98.5% and 92%. However, 134 mL chloroform, 336 mL methanol and 452 mL water were saved when the two phase were singled by GC. Our research showed an economical method for separating alkaloids from C. chinensis by HSCCC using the solvent system single prepared by GC.

Separation and Purification of Acetophenones from Cynanchum bengei Decne Root Bark by Combination of Silica Gel and High-speed Counter-current Chromatography

[Objectives] To develop a method for separation and purification of acetophenones from Cynanchum bengei Decne root bark by combination of silica gel and high-speed counter-current chromatography( HSCCC). [Methods]The crude extract of Cynanchum bengei Decne root bark was separated by silica gel column chromatography,and parts A and B containing acetophenones were obtained. Then,parts A and B were separated by HSCCC with a two-phase solvent system composed of petroleum ether-ethyl acetate-methanol-water( 4∶ 6∶ 4. 5∶ 5. 5 and4∶ 6 ∶ 3 ∶ 7, V/V), respectively. [Results] From 260 mg of part A, four compounds with p-dihydroxybenzene 3. 9 mg(Ⅰ),4-hydroxyacetophenone 17. 1 mg( Ⅱ),2,5-di-hydroxyacetophenone 13. 3 mg(Ⅲ) and 2,4-dihydroxyaceto-phenone 21. 0 mg(Ⅳ) were obtained. And from 300 mg of part B,136 mg of Radix Cynanchi Bungei benzophenone(Ⅴ) was obtained. The purity of compounds determined by HPLC was 97. 0%,96. 6%,99. 2%,99. 7%,99. 5%,respectively. [Conclusions] The established method is simple and efficient. It can be used for separation of acetophenones from Cynanchum bengei Decne root bark and has better practical value,which could provide a reference basis for development and utilization of Cynanchum bengei Decne root bark.

Isolation and Purification of Isoaloeresin D and Aloin from Aloe vera by High-speed Counter-current Chromatography

Objective To develop an efficient method to isolate and purify the main components isoaloeresin D and aloin from Aloe vera for its industrial production.Methods High-speed counter-current chromatography was used to isolate isoaloeresin D and aloin in a one-step separation from dried crude extract of A.vera.The biphasic solvent system composed of hexane-ethyl acetate-acetone-water(0.2:5:1.5:5) was used at a flow rate of 1.0 mL/min,while the lipophilic phase was selected as the mobile phase and the apparatus was rotated at 840 r/min.The effluent was detected at 254 nm.Results Isoaloeresin D(53.1 mg) and aloin(106.9 mg) were separated from the crude extract(384.7 mg) with the purities of 98.6% and 99.5%,respectively.Conclusion HSCCC is a powerful technique for isolation and separation of chemical composition from aloe.

Preparative Separation of Four Alkaloids from Gelsemium elegans by High-speed Counter-current Chromatography

Objective To develop an efficient preparative method for the separation of Gelsemium alkaloids from Gelsemium elegans. Methods High-speed counter-current chromatography （HSCCC） with several two-phase solvent systems was investigated for the separation of Gelsemium alkaloids. The purity and structure identification of the purified compounds were performed with HPLC and NMR spectra, respectively. Results In a single operation, 206.6 mg of crude alkaloid sample was separated to yield 28.7 mg of koumine, 24.9 mg of gelsemine, 26.9 mg of humantenine, and 7.2 mg of gelsevirine, with the purities of 97.8%, 95.4%, 97.4%, and 93.5%, respectively. Conclusion A preparative HSCCC method is successfully established for the separation of four Gelsemium alkaloids from G. elegans with a modified two-phase solvent system com posed of n-hexane-ethyl acetate-ethanol-O. 5% triethylamine-H2O （3：5：3：4）.

活性引导结合高速逆流色谱分离蓝莓活性成分及其与α-葡萄糖苷酶的相互作用

基于活性引导结合高速逆流色谱(HSCCC)技术,分离蓝莓中具有抑制α-葡萄糖苷酶活性的组分。首先,经不同溶剂提取后,活性成分在水中得到富集;其次,通过HSCCC分离水提物,得到6种组分,其中F4对α-葡萄糖苷酶的抑制率显著高于其它几种;再次将F4采用Sephadex LH-20葡聚糖凝胶纯化,得到高纯的组分Ⅰ;最后通过紫外光谱、傅里叶红外光谱、高效液相色谱-质谱联用及核磁技术鉴定组分Ⅰ为矢车菊-3-O-葡萄糖苷(C3G),纯度为95.06%。此外,采用多光谱扫描和分子对接技术对C3G与α-葡萄糖苷酶的相互作用进行表征。研究发现C3G与α-葡萄糖苷酶通过氢键自发结合形成复合物。与C3G复合后,α-葡萄糖苷酶的二级结构发生不同程度的变化,其中α-螺旋和β-转角降低,β-折叠和不规则卷曲增加。分子对接模拟发现C3G与残基Leu 313、Ser 157、Tyr 158、Phe 314、Arg 315和Asp 307以氢键结合,并与周围4个疏水残基存在疏水作用,共同维持复合物结构。本研究结果对开发2型糖尿病功能性食品具有重要意义。

薄层色谱-荧光法测定黄连生物碱分配系数

建立了薄层色谱和荧光分析法测定黄连生物碱在高速逆流色谱溶剂体系中分配系数的方法。样品在溶剂体系中分配平衡后,取等量的上下相,经点板、展开、刮板,提取后用荧光分光光度法检测样品的荧光值（激发波长365 nm,发射波长409 nm）,并计算样品在溶剂体系中的分配系数。在一定的浓度范围内,4种生物碱的含量与荧光强度呈良好的线性关系,加样回收率为94.7%~104.1%;相对标准偏差为1.9%~3.8%。本方法测定的分配系数与HPLC法无显著性差异。本方法准确度高,耗时少,应用范围广。

应用洗脱-推挤逆流色谱法高效分离制备人参皂苷Rg_1、Rf及Rd

目的运用洗脱-推挤逆流色谱技术(EECCC)分离制备人参皂苷Rg1、Rf及Rd。方法以乙酸乙酯-正丁醇-0.1%甲酸水(2︰1︰3,v/v)为溶剂体系,上相为固定相,下相为流动相,仪器转速为1 250 r/min,操作体积流量为40 mL/min,切换体积为2 400 mL。结果在此条件下,经一步纯化从300 mg样品中分离纯化得到71 mg人参皂苷Rg1、21 mg人参皂苷Rf及53 mg人参皂苷Rd,经高效液相色谱分析,纯度分别达到96.2%、94.3%和95.1%。结论 EECCC制备方法快速,简单。对于分离分配系数高的物质十分有效。

超临界CO_2萃取-高速逆流色谱分离纯化丹皮中丹皮酚

采用超临界CO2提取中药丹皮中总丹皮酚,选择萃取温度、萃取压力、物料粒度为因素进行正交实验优选出超临界CO2萃取的最佳工艺条件:即物料粒度40～60目,萃取温度40℃,萃取压力20MPa,提取率可达90%以上。将萃取后的总丹皮酚应用高速逆流色谱进行分离纯化,两相溶剂系统为石油醚-乙酸乙酯-甲醇-水(1:0.4:1:0.4),进样量为330mg,得180mg纯度为99.0%的丹皮酚。

紫薯中6,7-二甲氧基香豆素和5-羟甲基糠醛的分离鉴定

采用薄层色谱-荧光分析联用法筛选,确定正己烷∶乙酸乙酯∶甲醇∶水为1∶2∶1∶1(V/V)的混合液为高速逆流色谱(HSCCC)溶剂体系,并采用HSCCC技术首次从紫薯块根中分离得到两种目标产物,经核磁共振鉴定并与有关文献结果对比,两种目标产物分别为6,7-二甲氧基香豆素和5-羟甲基糠醛.经HPLC分析与面积归一化法计算,6,7-二甲氧基香豆素和5-羟甲基糠醛粗制品纯度分别为92%和96%.试验结果对进一步认识紫薯的保健功能,深入研究6,7-二甲氧基香豆素及5-羟甲基糠醛的药理作用有重要意义.

超临界CO2萃取-高速逆流色谱快速分离制备板蓝根中的表告依春

目的:建立从板蓝根中快速分离制备高纯度表告依春的方法。方法:板蓝根药材粉碎后采用超临界CO2萃取法提取表告依春粗提物,选择萃取温度、物料粒度、萃取时间和萃取压力为因素进行正交实验优选出超临界液CO2萃取的最佳工艺条件:即萃取压力20MPa,萃取温度为50℃,萃取时间为60 min,物料粒度40～60目。萃取得到的表告依春粗提物采用高速逆流色谱法进行分离制备,两相溶剂体系为乙酸乙酯-正丁醇-甲醇-水(9∶1∶2∶9,v/v),进样量为400mg,得到纯度为99.6%的表告依春103.7mg。结论:该方法简便、快速、低能耗、回收率高,为板蓝根中表告依春单体的制备提供了新方法。

高速逆流色谱分离纯化远志中3,6′-二芥子酰基蔗糖酯和远志蔗糖酯A

目的研究制备型高速逆流色谱从远志中分离纯化3,6′-二芥子酰基蔗糖酯和远志蔗糖酯A。方法采用分析型高速逆流色谱摸索制备型高速逆流色谱的分离条件。根据化合物的光谱数据,鉴定结构。结果选择乙酸乙酯-正丁醇-水(4:1:5,v/v/v)为制备型高速逆流色谱分离的溶剂系统,从400mg远志样品中得到3,6′-二芥子酰基蔗糖酯和远志蔗糖酯A分别为24.6mg和45.2mg,HPLC检测纯度分别为93%和95%。结论本法简单快速,为远志及同属植物中糖酯类化合物的制备提供了一种新的分离方法 。

pH-区带精制逆流色谱分离高F值寡肽新技术研究

高F值寡肽是一种由2～8个氨基酸组成的生理活性肽。本研究采用胃蛋白酶和O／一胰凝乳蛋白酶对草鱼蛋白进行了两步酶解，高效液相色谱对酶解液进行了肽谱分析，以制备改善肝性脑病的高F值寡肽。结果表明，草鱼蛋白酶解液中含有高支低芳氨基酸的寡肽组分，开发一种pH一区带精制逆流色谱分离新技术，所用体系为甲基叔丁基醚：正丁醇：乙腈：水（2：2：1：5，V／V／V／V），上相中加入20mM三乙胺和20％磷酸二（2-乙基己基）酯（DEHPA）作为固定相，下相分两部分，分别加入10mM HCl和20m MHCl作为流动相，进行梯度洗脱。成功地对酶解液中的混合组分进行了分离，得到了5个高F值（F〉20）的分离组分，估测其F值（F=OD214nm／OD280nm）高达24．7—36．4。该结果为利用低值鱼蛋白酶解制备功能性活性肽提供了新的制备方法。

高速逆流色谱-高效液相色谱法制备甘薯茎叶中化合物

以徐薯18型甘薯茎叶为原料,建立了高速逆流色谱法制备分离甘薯茎叶中化合物的方法.以正己烷-乙酸乙酯-甲醇-水(0.5%乙酸)(体积比0.5:5:1:5)为溶剂系统,上相为固定相,下相为流动相,流速2mL/min,转速900r/min,进行2次分离,并结合1次制备高效液相,共分离得到7个高纯度化合物.结合化学显色反应、紫外扫描、高效液相色谱等,初步鉴定4个为黄酮类化合物,其中1个为芦丁,1个为槲皮苷.

高速逆流色谱法制备分离库拉索芦荟中的2’-对香豆酰芦荟宁

采用高速逆流色谱法分离纯化库拉索芦荟中的2’-对香豆酰芦荟宁。以正己烷-乙酸乙酯-丙酮-水(1∶5∶1∶5,V/V/V/V)为溶剂体系,上相为固定相,下相为流动相,线圈转速为860 r/min,流速为2 mL/min,紫外检测波长为300 nm,一次进样85 min内从487.5 mg库拉索芦荟丙酮提取物中分离得到19.5 mg单体组分,经高效液相色谱分析,测定纯度为95.6%(峰面积百分比),通过质谱、红外、紫外和核磁技术进行结构鉴定,确定组分为2’-对香豆酰芦荟宁。该法具有操作简便、速度快、样品制备量大、节省溶剂及回收率高等优点,可为芦荟宁类化合物的分离提供高效、稳定及可靠的方法。

高速逆流色谱结合硅胶柱色谱法分离制备干姜中的6-姜酚、8-姜酚、6-姜烯酚

通过实验建立了高速逆流色谱(HSCCC)结合硅胶柱色谱法分离制备干姜中6-姜酚、8-姜酚和6-姜烯酚的方法。干姜样品采用乙酸乙酯超声提取,提取物经过硅胶柱色谱粗分,选取其中A3和A4两个馏分进行高速逆流色谱分离,所得单一成分采用高效液相色谱(HPLC)检测纯度,并采用电喷雾质谱(ESI-MS)、核磁共振氢谱(1H NMR)对所得化合物的结构进行鉴定。研究结果表明,该方法简便快捷,所得产物纯度高、制备量大、分离效率好。

千层塔提取物废液中3,4-二羟基肉桂酸和3,4-二甲氧基肉桂酸的提取

利用高速逆流色谱(HSCCC)对千层塔提取物废液中含量较高的2个同系物进行初步纯化分离,再利用高效液相色谱(HPLC)对收集到的样品进行同系物分离,得到8mg化合物A,7mg化合物B,纯度均在95%以上.经核磁共振仪(NMR)鉴定2个组分的化学结构,结果证明,千层塔提取物废液所含的主要成分即2个同系物分别为3,4-二羟基肉桂酸和3,4-二甲氧基肉桂酸.结论也同时证实高速逆流色谱与高效液相色谱联用能够有效分离样品所含同系物,且工业提取千层塔有效成分后的废液中仍含有价值物质.

高速逆流色谱法分离白木香叶片中的洋芹素-7,4-二甲醚及其体外清除亚硝酸盐作用研究

[目的]分离白木香的叶片、树干、果实和花等部位中的洋芹素-7,4’-二甲醚(7,4’-二甲氧基-5-羟基黄酮),并检测该化合物对亚硝酸盐的清除作用。[方法]以经济林木白木香的叶片为原料,用高速逆流色谱技术分离目标化合物,并在pH3.0和7.0条件下检测该化合物对亚硝酸盐的清除作用。[结果]适合分离洋芹素-7,4’-二甲醚的溶剂体系是正己烷-乙酸乙酯-甲醇-水(1∶1.5∶1.5∶1,V/V/V/V),用该溶剂体系成功分离得到纯度为98.31%的洋芹素-7,4’-二甲醚。pH3.0条件下洋芹素-7,4’-二甲醚对亚硝酸盐的清除率为12.40%;pH 7.0条件下对亚硝酸盐的清除率为8.72%。[结论]用高速逆流色谱技术成功从白木香叶片中分离到洋芹素-7,4’-二甲醚;洋芹素-7,4’-二甲醚是白木香叶提取物清除亚硝酸盐作用的活性成分之一。

应用高速逆流一次性分离川芎中的蛇床内酯A和Z-蒿本内酯

目的:研究高速逆流色谱分离川芎活性成分的方法。方法:应用高速逆流技术一次性从川芎挥发油中分离出主要成分蛇床内酯A和Z-蒿本内酯。采用两相溶剂系统正己烷-乙酸乙酯-乙醇-水的四元体系,上相为固定相,下相为流动相,转速为892RPM,流速为1.2mL/min。结果:经过EI-MS和1H-NMR的鉴定,可以分别确认是蛇床内酯A和Z-蒿本内酯,纯度可以达到95%。结论:高速逆流色谱技术适合应用于分离内酯类这种极性较小的成分,分离度好,产物纯度较高。