反相高效液相色谱法测定人尿中利凡诺

建立了运用反相高效液相色谱法测定人尿中利凡诺的方法.采用Spherisorb C18色谱柱(250 mm×4.6 mm i.d.,5 μm);流动相: V(甲醇)∶V(乙腈)∶V(0.2 mol/L NH4Ac)=60∶37∶3;流速: 1.0 mL/min;柱温: 40 ℃;荧光检测器: 激发波长360 nm,发射波长500 nm.在5 ng/mL～1 μg/mL质量浓度范围内,呈现良好线性(r=0.9999),检出限为1 ng/mL.     

荧光试剂柱前衍生高效液相色谱-荧光检测生物检材中的氟乙酸钠

建立了以4-溴甲基-7-甲氧基香豆素(BrMMC)为柱前荧光衍生试剂,反相高效液相色谱荧光检测(HPLC-FLD)生物检材中氟乙酸钠的分析方法。采用Hewlett Packard RP-18色谱柱,以甲醇-水(60/40,V/V)为流动相,流速1.0 mL/min,柱温26℃,荧光检测:eλx=319 nm,eλm=390 nm,进样量2μL。结果表明:该法在氟乙酸钠含量为0.1~20μg/mL范围内与其峰面积呈良好的线性关系,线性相关系数为0.9996,检出限(S/N=3)为5×10-10mol/mL,相对标准偏差(RSD)小于4%。本法用于中毒死亡者的血液样品及其它检材的测定,效果良好。     

高效液相色谱-荧光检测法测定环境水中的苯胺和苯酚

建立了用高效液相色谱荧光检测法同时测定环境水中苯胺和苯酚的分析方法。色谱柱为EclipseXDB C8(4.6mmi.d.×150mm,5μm),流动相为甲醇 磷酸盐缓冲液(0.1mol/L磷酸二氢钾 0 1mol/L磷酸氢二钠,pH6.87)V(甲醇)∶V(磷酸盐缓冲液)=50∶50,流速1 0mL/min,柱温25℃,检测波长0minλex/λem=230/340nm(测定苯胺),3.5minλex/λem=215/300nm(测定苯酚)。测定苯胺的线性范围0.2～120ng,r=0.9999,检出限0.01ng;测定苯酚的线性范围0.4～500ng,r=0.9998,检出限0.02ng,回收率98.1%～101.2%。该方法已用于对环境水中苯胺和苯酚的测定。     

荧光检测-高效液相色谱法测定水果、蔬菜中抗蚜威残留量

建立了水果、蔬菜中抗蚜威残留的荧光检测-高效液相色谱法。样品以乙腈提取,固相萃取氨基小柱(LC-NH2)净化,Waterscarbamateanalysis(3.9mm×150mm,4μm),V(甲醇)∶V(水)∶V(乙腈)=16∶68∶16为流动相,柱温30℃,流速为1.5mL/min进行分离,用荧光检测器进行检测,激发波长和发射波长分别为317nm,392nm。回收率在98.5%~105.4%,相对标准偏差为3.0%~4.6%,检出限为0.01mg/kg。     

高效液相色谱-荧光检测器法测定2-噁唑烷酮的含量

建立一种利用高效液相色谱结合荧光检测器准确测定2-噁唑烷酮含量的方法。样品中的2-噁唑烷酮和占吨氢醇在60℃的条件下衍生70 min后,直接进样分析。采用月旭XB-C18色谱柱,流动相为0.02 mol/L乙酸钠水溶液和乙腈,检测器波长为λex=213 nm,λem=308 nm,流速1.0 mL/min,柱温35℃的条件下。2-噁唑烷酮浓度在0.5~50.0mg/mL时,线性关系良好(R2=0.9995),检测限和定量限分别为0.005 mg/L、0.016 mg/L。该方法准确、灵敏、快速,适用于2-噁唑烷酮含量的检测。     

5-马来酰亚胺-2-(间马来酰亚胺基苯基)苯并噁唑用于荧光光度法直接测定还原型谷胱甘肽的研究

以5-马来酰亚胺-2-(间马来酰亚胺基苯基)苯并噁唑(DMPB)为荧光试剂,建立了在一定量半胱氨酸(Cys)存在下荧光光度法直接测定还原型谷胱甘肽(GSH)的新方法。研究表明,DMPB荧光很弱,其结构中的两个马来酰亚胺基团都能与GSH或Cys发生反应,生成具有强荧光的产物。并且DMPB与GSH或Cys的生成物(分别称为DMPB-GSH和DMPB-Cys)的最大荧光波长会以不同的速率从eλx/eλm=302/372nm红移至eλx/eλm=310/430 nm,最终均在eλx/eλm=310/430 nm处稳定。在pH 7.0的Na2HPO4-KH2PO4缓冲溶液中和35℃下,DMPB与GSH或Cys反应15 min后,生成的DMPB-GSH的最大荧光波长为eλx/eλm=302/372 nm,且最大荧光强度可以稳定1h,而DMPB-Cys的最大荧光波长为eλx/eλm=310/430 nm,且荧光较弱。利用这一差别,我们选择在eλx/eλm=302/372 nm的荧光波长下测定GSH,完成了0.3倍(Cys∶GSH,摩尔比)Cys存在下对GSH的直接测定,方法线性范围为4.0×10-8~9.6×10-7mol.L-1,检出限(S/N=3)为1.5×10-9mol.L-1。用该法测定了人全血中的GSH,结果令人满意。     

一种测定MDR肿瘤细胞内外阿霉素浓度的方法

研究提出K562／A细胞内外阿霉素浓度的反相高效液相色谱-荧光测定法．细胞内阿霉素浓度测定采用Lichrospher C18色谱柱，甲醇-0．01％醋酸(50：50，V／V)流动相,流速1．0mL／min，柱温35℃；细胞外阿霉素浓度测定采用Lichrospher C18色谱柱，甲醇-0．01％醋酸(55：45，V/V)流动相，流速0．8mL／min，柱温35℃．荧光检测器波长λex=495nm，λem=560nm，均以盐酸柔红霉素为内标．研究结果表明，该方法简单、准确、线性范围宽、检测限低，精确度和回收率良好，可用于多药耐药肿瘤细胞内外阿霉素浓度的动态变化规律研究．     

咔唑-9-乙基氯甲酸酯柱前衍生胺类化合物高效液相色谱分离

采用一种新的氯甲酸酯类荧光衍生试剂咔唑-9-乙基氯甲酸酯进行柱前衍生胺类化合物并通过荧光检测的方法进行高效液相色谱(HPLC)分析。衍生物的荧光激发和发射波长为λcr／λcrs=293/365nm。色谱柱：Hypersil BDS C18柱，柱温：35℃；流速：l mL/min；流动相A为水/乙腈(20／80，V／V)，流动相B为乙腈/水(95／5，V／V)。衍生试剂用量(mol)是胺类化合物总量的3～4倍时，衍生化产率最大且恒定。该方法具有检测灵敏度高，衍生化反应简单、快速、不受样品基质盐分的干扰，尤其适合天然生物样品，食品及饲料中的胺类化合物的分析。     

测定裸大麦中生育酚和生育三烯酚的正相高效液相色谱法

建立了同时测定裸大麦中α_、β_、δ_生育酚和α_、γ_、δ_生育三烯酚以及γ_生育酚 +β_生育三烯酚含量的正相高效液相色谱法;采用国产YWG_SiO2 柱 (250mm×4mmID ,5μm) ,V 正己烷∶V 异丙醇=99∶1体系为流动相 ,流速为1.2mL/min,荧光检测器检测 ,激发波长290nm ,发射波长330nm,并采用正交设计法优化样品的皂化工艺。     

铽增敏高效液相色谱柱后衍生荧光检测法同时检测鸡肉中的三种氟喹诺酮类药物残留

基于氟喹诺酮类药物与铽离子形成配合物后的荧光增强作用,建立了同时检测鸡肉中氟喹诺酮类(FQs)药物环丙沙星、诺氟沙星和恩诺沙星残留的Tb3+增敏高效液相色谱（HPLC）柱后衍生荧光检测方法。优化的实验条件如下：流动相为0.05 mol/L 醋酸/醋酸钠缓冲液(pH 6.0)-乙腈(体积比为89∶11),色谱柱为Hypersil BDS-C18,柱温40 ℃,流速0.8 mL/min;Tb3+浓度为8×10-5 mol/L;衍生反应温度40 ℃,衍生泵流速0.5 mL/min;荧光检测激发波长271 nm,发射波长545 nm。实验结果表明,将上述3种药物以1.0,10.0,50.0,100.0 ng/g水平添加到鸡肉后的回收率范围为66.3%~88.0%,相对标准偏差（RSD）均小于15.0%。定量分析的线性范围为0.1~500 ng/mL,方法的日内和日间RSD均小于13.0%;最低检出限分别为0.05(环丙沙星)、0.05(诺氟沙星)和0.08(恩诺沙星)ng/g,比前人报道的非衍生高效液相色谱荧光检测法检测FQs药物的灵敏度有极大的提高。该项研究为FQs药物多残留检测提供了灵敏度更高的新方法。     

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.