胶束薄层扫描法测定黄连及其制剂中的小檗碱、巴马汀和药根碱

以2％CPC-醋酸乙酯(9：1)胶束溶液为展开剂,在聚酰胺薄膜上成功地分离了小檗碱、巴马汀和药根碱。以345nm为测定波长,550nm为参比波长进行扫描测定,建立了一种新的同时测定黄连及其制剂中小檗碱、巴马汀和药根碱的胶束薄层扫描法。小檗碱、巴马汀和药根碱的线性范围分别为0．2—2．4、0．1—1．0和0．1—1．0μg;回收率分别为97．7％-99．4％、101．7％～102．6％和96．7％-97．8％;相对标准偏差分别为1．4％-1．7％、1．9％-2．7％和1．8％-2．2％。     

甘肃产三颗针植物中生物碱的测定及分布状态的研究

建立梯度洗脱双波长HPLC法同时测定小檗属植物中小檗胺、药根碱、巴马汀、小檗碱含量的方法,并应用该法分析采集于甘肃不同产地、不同品种小檗属植物的茎木、根木、茎皮、根皮样品,研究小檗属植物中生物碱的分布状态,考察其药用价值。小檗胺、药根碱、巴马汀、小檗碱线性范围分别为：0．015～2．56μg(r=0．9998);0．012～2．0μg(r=0．9996);0．010～0．52μg(r=0．9999);0．028～4．74μg(r=0．9998)。结果表明,甘肃不同产地、不同品种,不同部位三颗针植物中生物碱的含量分布有明显的差异。     

微量量热法研究黄连中小檗碱类生物碱对金黄色葡萄球菌生长代谢的影响

采用微量量热法研究中药黄连中具有抑菌作用的3种小檗碱类生物碱成分对金黄色葡萄球菌生长代谢的影响．在不同给药条件下,以表达功率．时间曲线（热谱曲线）的特征参数生长速率常数k、半数抑菌浓度（IC50）、最大输出功率（Pmax）及达峰时间（tp）和总产热量（Qt）为指标,对3种小檗碱类生物碱成分抑制金黄色葡萄球菌生长代谢程度进行客观地量化评价．结果表明,k、Pmax和Qt均随3种小檗碱类生物碱成分浓度的增加而相应的减小;tp随3种小檗碱类生物碱成分浓度的增加而相应的延长;其IC50分别为小檗碱101．4μg／mL、巴马汀241．0μg／mL和药根碱792．3μg／mL,即抑菌活性大小顺序为小檗碱〉巴马汀〉药根碱．初步构效关系研究提示,位于苯环的C2、C3上的亚甲二氧基或甲氧基较羟基更有助于提高其抑菌活性．     

高效毛细管电泳测定黄连及成药中小檗碱型生物碱的含量

报道了黄连及成药中七种小檗碱型生物碱的高效毛细管电泳分离测定方法。缓冲液由６５％磷酸氢二钠（用磷酸调ｐＨ７．０）和１５％甲醇组成。方法具有良好的精密度、回收率及线性关系。并用此法定量测定了黄连及六种成药中三种生物碱（小檗碱、巴马汀、药根碱）的含量。     

溴酚蓝离子对萃取分光光度法测定长春花中总生物碱

以文多灵为对照品,溴酚蓝为显色剂,在pH3．0缓冲溶液条件下于30℃显色5min,用三氯甲烷萃取,于413nm波长处采用离子对萃取分光光度法测定长春花中总生物碱的含量。结果表明：文多灵在0．04～0．28g·L^-1浓度范围内与吸光度呈线性关系,回归方程为y=0．1824X－0．03,相关系数为0．9993,文多灵的平均回收率为99．49％,总生物碱样品在10～50min内测定稳定。经测定长春花的根、茎、叶、花、种子等不同部位中总生物碱含量分别为2．230％,0．411％,1．098％,0．503％和0．013％。     

高效液相色谱法测定香连丸及组方药材中5种活性组分的含量

建立了香连丸及组方药材中药根碱、巴马汀、小檗碱、木香烃内酯和去氢木香内酯的含量测定方法．采用反相高效液相色谱,Hypersil ODS（5μm,4．6mm×250mm）色谱柱,流动相为乙腈：水（70：30,V：V）,流速1．0mL／min,柱温30℃,检测波长为210n／n测定木香烃内酯和去氢木香内酯的含量;采用高效液相胶束色谱,Kromasil ODS（5la,m,4．6mm×150mm）色谱柱,流动相为0．2mol／LNaH2P04水溶液：7．00mmol／L十二烷基硫酸钠：乙腈（35：35：30,V：V：V）,流速1．0mL／min,柱温30℃,检测波长为350nm测定药根碱、巴马汀、小檗碱的含量．结果显示5种活性成分在适当的线性范围内均具有良好的线性关系（r大于0．9993）,平均回收率在87．67％～102．37％之间,RSD小于3．13％;结果表明方法简便、灵敏、准确,重现性好．     

一种用于中药纯化过程的近红外光谱分析新方法

针对中药大孔吸附树脂纯化过程缺乏在线检测分析手段等问题，提出基于光纤 近红外透射光谱的过程分析新方法．以黄连提取物为例，采用HPLC分析测定值作参 比，用偏最小二乘算法建立了近红外透射光谱校正模型，并成功地用于预测黄连生 物碱在大孔树脂纯化过程中的洗脱曲线．本方法实时、快速，可同时测定洗脱物中 盐酸小檗碱、盐酸巴马亭、盐酸药相碱和黄连总生物碱的浓度．预测精度满足工业 过程分析要求，为提高中药质量分析水平提供了新的途径．     

离子液体作为流动相添加剂高效液相色谱法同时测定黄连中5种生物碱

建立了高效液相色谱法(HPLC)同时测定黄连中5种生物碱含量的方法。黄连药材经甲醇超声提取后,用Spherigel C_(18)色谱柱(250×4.6 mm,5μm)进行HPLC测定,流动相为含有1-己基-3-甲基咪唑四氟硼酸盐添加剂的甲醇-水(25:75,V/V),流动相流速为1.0 m L/min,检测波长为345 nm,同时测定了黄连药材中药根碱、表小檗碱、黄连碱、巴马汀和小檗碱含量。在1~200μg/m L浓度范围内,5种生物碱的线性相关系数均大于0.9990,药根碱、表小檗碱、黄连碱、巴马汀和小檗碱的检测限(LOD)分别为0.19,0.13,0.11,0.18,0.15 mg/L。测定了3种不同产地的黄连生物碱的含量并进行加标回收,回收率在98%~102%之间。     

毛细管电泳安培法检测黄连中的生物碱

本文建立了一种简单快速的毛细管电泳安培检测法分离检测黄连中的黄连碱、盐酸小檗碱、巴马汀、和药根碱.以150 μm的铂电极为工作电极,考察并优化了影响分离和检测的条件.在80 mmol/L磷酸盐缓冲液中添加50%甲醇(pH 6.0),分离电压15 kV,检测电位1.2 V (vs.Ag/AgCl)的条件下,黄连碱、盐酸小檗碱、巴马汀和药根碱在8min内获得良好分离.黄连碱、盐酸小檗碱、巴马汀和药根碱的峰电流面积和浓度分别在1.0×10-5～2.0×10-7,1.0×10-5 ～8.0×10-8 mol/L,1.0×10-5～1.0×10-7 mol/L和1.0×10-5～2.0×10-7mol/L范围内呈良好的线性关系.检出限(S/N=3)低达10-8mmol/L.方法应用于微波辅助溶剂提取黄连中生物碱的测定,回收率在97.0%～104%,RSDs≤3.8%,结果满意.     

毛细管电泳法测定白头翁汤中黄连和黄柏共煎生物碱的煎出量

 建立了利用毛细管电泳简便、准确地测定白头翁汤中黄连和黄柏共煎生物碱煎出量的方法。采用自组装毛细管电泳装置,采用75μmi.d.×50cm弹性石英毛细管,以0 05mol/LNa2B4O7 CH3OH(体积比为85∶15)溶液作缓冲液,运行电压为14kV,检测波长为232nm。另外,通过实验优化了提取溶剂中乙醇的含量。实验结果表明:以小檗碱、巴马汀提取量为指标,30%(体积分数)的乙醇水溶液是提取白头翁汤中黄连和黄柏共煎生物碱的最佳溶剂。小檗碱和巴马汀的质量浓度分别在15 0mg/L～65 0mg/L、12 5mg/L～50 0mg/L时与其峰面积有良好的线性关系;小檗碱的平均回收率不低于95%。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.