反相高效液相色谱法同时测定苦豆子及其制剂中苦参碱和氧化苦参碱

建立了用反相高效液相色谱法测定苦豆子及其制剂中苦参碱和氧化苦参碱的方法。色谱条件：ＯＤＳ柱，甲醇－水－三乙胺，φ（甲醇）＝０．５５，φ（三乙胺）＝０．０００２为流动相，紫外检测波长２１５ｍｍ。为苦豆子及共制剂的质量评价提供了一种方法     

反相液相色谱法测定苦参中苦参碱和氧化苦参碱

建立反相液相色谱法测定苦参中苦参碱和氧化苦参碱含量的方法。提取溶剂为乙醇,选择C18色谱柱,以甲醇–水–三乙胺溶液(55∶45∶0.2)为流动相,流量为0.8 mL/min,紫外检测器波长为210 nm。苦参碱和氧化苦参碱的质量浓度在10~200 mg/L范围内均与其色谱峰面积呈良好的线性,线性相关系数均大于0.999,检出限分别为0.05,0.1 mg/L。苦参碱和氧化苦参碱的加标回收率分别为98.47%,97.89%,测定结果的相对标准偏差分别为1.32%,1.08%(n=6)。该方法操作简便,干扰少,灵敏度高。     

用MAA荧光猝灭法研究苦参碱和氧化苦参碱药物代谢动力学

用乙酸（β－二羟基－α－甲基）乙烯酯（MAA）荧光法对苦参碱1氧化苦参碱在单味药、单体药和复方药中药物代谢这进行了对比研究,有兔的血药浓度计算了苦参碱和氧化苦参碱的药物代谢动力学参数,实验结果提示苦参碱、氧化苦参碱在方药中的吸收代谢较好。     

用荧光熄灭法监测苦参碱氧化苦参碱的血药浓度

用自制ＭＡＡ荧光试剂，对兔体中苦参碱和氧化苦参碱进行２４ｈ监测，检出限分别为１．４１×１０＾－１１ｇ／ｍＬ和４．５×１０＾－１２ｇ／ｍＬ，血中苦参碱和氧化苦参碱的肖度在１０＾－９－１０＾－８７ｇ／ｍＬ之间，该法快速，灵敏，效果良好。     

毛细管电泳高频电导法测定苦参中的苦参碱和氧化苦参碱

建立了用毛细管电泳高频电导法测定苦参药材中苦参碱和氧化苦参碱的方法。对电泳介质的种类、浓度、pH值以及操作电压和进样时间对分离检测的影响进行了研究。缓冲液为2.0mmol LNa2HPO4 1.0mmol LH3PO4 体积分数为25%乙醇(pH6.0),分离电压为16.0kV时可实现较好的分离与检测。苦参碱和氧化苦参碱的线性范围为:25.0～1.00×103μg mL(相关系数分别为0 987和0.999);RSD(n=6)分别为:2.1%和0.70%;检出限分别为10.0和5.00μg mL;回收率分别为92.7%～99.1%和100%～102%。     

薄层色谱—荧光熄灭法测定苦参碱的含量

用丙二酸和醋酐缩合自制成荧光试剂乙酸（β－二羧基α－甲基）乙烯酯，利用苦参碱对其有强烈的熄灭作用，达到定量测定苦参碱的目的。其线性范围为２×１０＾－６￣２×１０＾－９ｇ／ｍＬ；最低检测限为１．４×１０＾－１１ｇ／ｍＬ；测得苦参碱和广豆根中苦参碱的含量分别为０．１６％和０．１１％。     

毛细管电泳中移动反应界面法富集和检测尿样中的氧化苦参碱

采用建立在移动反应界面理论上的体系进行尿样中氧化苦参碱的富集与定量检测。与传统的毛细管电泳相比,体系中引入了富集缓冲溶液(富集相)和分离缓冲溶液(分离相)。优化的条件如下:样品缓冲溶液为20 mmol/L 甲酸钠(用氨水调节pH至10.70),富集缓冲溶液为40 mmol/L 甲酸-甲酸钠(pH 2.60),分离缓冲溶液为100 mmol/L 甲酸-甲酸钠(pH 4.80);样品相压力进样1.4 kPa×3 min,富集相压力进样1.4 kPa×7 min,紫外检测波长210 nm,电压21 kV。氧化苦参碱在2.2~65 mg/L的质量浓度范围内呈良好的线性关系(r=0.9991),检出限为0.74 mg/L,灵敏度比常规毛细管电泳方法提高约70倍,重现性良好。该方法已经成功地应用于尿样中氧化苦参碱的检测。     

苦参配方颗粒的高效液相色谱指纹图谱研究及定量分析

研究了苦参配方颗粒的指纹图谱和含量测定。采用高效液相色谱法,在C18柱上以乙腈-磷酸氢二钠水溶液(20 mmol/L,磷酸调pH 7.1)进行梯度洗脱,柱温35℃,检测波长220 nm,用指标成分氧化苦参碱、氧化槐果碱和苦参碱进行了定位,并在同一色谱条件下同时测定了它们的含量。确定了15个共有峰,其中7、8和11号峰分别为氧化苦参碱、氧化槐果碱和苦参碱。10批样品平均相似度为0.99以上,三个成分的含量分别为:氧化苦参碱50.0~79.8 mg/g;氧化槐果碱13.5~18.1 mg/g;苦参碱16.5~30.1 mg/g。结果表明:指纹图谱与指标成分含量测定相结合,可提高苦参配方颗粒的内在质量控制水平。     

HPLC法测定苦参碱葡萄糖注射液中苦参碱的含量

苦参碱是一种生物碱 ,是豆科植物苦参的主要有效成分之一 ,其药理作用在临床表现显著 ,具有抗病原微生物、抗肿瘤、抗炎症、抗过敏、平喘等作用[1 ] 。近年来对苦参碱的测定方法有薄层扫描法、气相色谱法、高效电泳法、高效液相色谱法等[2 ] ,但有关苦参碱葡萄糖注射液中的苦参碱含量分析未见报道。本文采用高效液相色谱法建立了苦参碱葡萄糖注射液中苦参碱含量测定方法 ,避免了葡萄糖分解 ,可作为该制剂的质量控制方法之一。1　实验部分1 1　仪器与试剂高效液相色谱仪 (Ａｇｉｌｅｎｔ 1 1 0 0液相色谱系统 ,包括紫外检测器、四元梯度泵、…     

液相微萃取/后萃取-高效液相色谱法测定氧化苦参碱和苦参碱

建立了液相微萃取/后萃取-高效液相色谱法测定中药苦参、复方苦参注射液中氧化苦参碱和苦参碱含量的方法。利用自制的微萃取装置,选择异丙醇为萃取有机溶剂,2.00 mL NaOH(pH9)为供相,HCl(pH4)为接受相,聚丙烯腈纤维的长度为10 cm,搅拌速度为1500 r/min,萃取时间为30 min。萃取完成后,经高效液相色谱仪分析,测得氧化苦参碱和苦参碱线性范围分别为11~437 mg/L和10~433 mg/L;检出限均为1.0mg/L;相对标准偏差分别小于9.4%和6.7%。复方苦参注射液中氧化苦参碱和苦参碱的平均回收率分别为83.0%~116.1%和108.8%~117.8%;苦参药材中氧化苦参碱的平均回收率为104.3%~114.7%。本方法有机溶剂用量少,可有效去除复杂机体的干扰,测得结果满意。     

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.