流动注射化学发光法测定DL-酪氨酸

在甲醛存在下 ,高锰酸钾与DL 酪氨酸能够发生化学发光反应 ,产生很强的化学发光。据此采用流动注射技术 ,建立了一种测定DL 酪氨酸的化学发光分析法。方法的检出限为 2 .9× 1 0 - 8g/mL ,相对标准偏差为 1 .5 % ( 1 .0× 1 0 - 6g/mLDL 酪氨酸 ,n =1 1 ) ,线性范围为 1 .0× 1 0 - 7g/mL～ 5 .0× 1 0 - 6g/mL。     

电化学发光分析法测定异烟肼

基于在碱性介质中电氧化荧光素 (fluorescein)的弱电化学发光信号可被异烟肼增敏 ,据此 ,建立了测定异烟肼的高选择性电化学发光新方法。该方法测定异烟肼的线性范围为 2 .0× 1 0 - 7～ 8.0× 1 0 - 5g mL ,检出限为 1 .0× 1 0 - 7g mL ,相对标准偏差为 1 .4% (n =1 1 ;c=4.0× 1 0 - 6 g mL)。     

流动注射化学发光抑制法测定痕量钒(Ⅴ)

基于钒 (Ⅴ )对罗丹明B 过氧乙酸 NaOH体系化学发光具有强烈的抑制作用 ,建立了流动注射化学发光测定痕量钒 (Ⅴ )的新方法。该方法线性范围为2 .0× 1 0 - 9～ 1 .0× 1 0 - 6g/mL ,检出限为 3.0× 1 0 - 1 0 g/mL ,对 1 .0× 1 0 - 7g/mL钒(Ⅴ ) 7次平行测定的相对标准偏差为 2 .0 %。已用于环境水样、钢样中钒 (Ⅴ )的测定 ,初步探讨了发光反应及其抑制机理     

流动注射化学发光法测定安痛定注射液中的氨基比林

在甲醛存在下 ,高锰酸钾与氨基比林能够发生化学发光反应 ,产生很强的化学发光 ,据此采用流动注射技术建立了一种测定氨基比林的化学发光分析法。方法的检出限为 3 .0× 10 -8g/mL ,相对标准偏差为 1.3 % (4 .0× 10 -6g/mL氨基比林 ,n =11) ,线性范围为 1.0× 10 -7～ 8.0× 10 -5g/mL氨基比林。该法已用于安痛定注射液中氨基比林含量的测定。     

测定利血平的流动注射化学发光新体系

研究了利血平在酸性条件下与高碘酸钾和过氧化氢产生化学发光的行为 ,建立了高碘酸钾 -利血平 - H2 O2 - H2 SO4 流动注射化学发光新体系。利血平的浓度在 1 .0× 1 0 - 6～ 1 .0× 1 0 - 4g/m L范围内与化学发光强度呈良好的线性关系 ,检出限为 2 .7× 1 0 - 7g/m L。对 2× 1 0 - 5g/m L利血平进行 1 1次平行测定 ,得该法的相对标准偏差为 2 .63%。方法用于利血平片剂含量的测定 ,结果与药典法测得值一致     

偶合化学发光法测定环境水样中的痕量亚硝酸根

将亚硝酸盐在酸性条件下氧化亚铁氰化钾为铁氰化钾的反应 ,和尿酸 铁氰化钾 鲁米诺化学发光反应偶合一起 ,建立了一种间接测定亚硝酸根离子的新方法。讨论了酸度、反应物浓度、干扰离子等因素的影响。方法的检出限为5 .0× 1 0 - 1 1 g/mL ,对环境水样样品进行了平行测定 (n =1 1 ) ,其相对标准偏差为1 .8%～ 3 2 % ,线性范围为 1 .0× 1 0 - 9g/mL～ 1 .0× 1 0 - 5g/mL ,回收率为 94.3%～ 1 0 5 3%。     

新的化学发光体系测定铜

研究了水杨酸 (R)与Cu(Ⅱ )配合物 (CuR2 2 -)催化H2 O2 氧化鲁米诺产生化学发光反应 ,最低检出限为 6 .6×10 -11g/mL ,工作曲线线性范围为 1× 10 -10 ～ 1× 10 -7g/mL ,在检测 0 .1μgCu(Ⅱ )的浓度时的相对标准偏差 (RSD)为2 .7% .铜配合物化学发光法检测病毒灵片剂 (盐酸吗林胍片 )中微量铜时快速地得到准确的结果     

在线电生Mn(Ⅲ)流动注射化学发光法测定氨基比林

将恒电流电解法与流动注射技术相结合 ,在线电解定量产生不稳定化学发光试剂 Mn( ) ,基于 Mn( )能直接氧化氨基比林产生化学发光 ,建立了流动注射电化学发光测定氨基比林的新方法。在优化的实验条件下 ,测定氨基比林的线性范围为 5.0× 1 0 -7～ 1 .0× 1 0 -4 g/m L ,相关系数为 0 .9996,方法的检出限为 2 .0× 1 0 -7g/m L,相对标准偏差 r=2 .1 % ( 1 .0× 1 0 -5g/m L,n=1 1 )。该方法已应用于针剂、片剂中氨基比林的测定。     

流动注射-化学发光法测定盐酸林可霉素

盐酸林可霉素在 Na IO4 - H2 O2 - H+体系中能发生强的化学发光反应 ,据此建立了一种测定盐酸林可霉素的流动注射 _化学发光分析法 ,方法的检出限为 3.6× 1 0 -8g/m L,相对标准偏差为 1 .0 % (c S=1 .0× 1 0 -6g/m L,n=1 1 ) ,线性范围为 1 .0× 1 0 -7～ 9.0× 1 0 -5g/m L。该方法已用于盐酸林可霉素注射液的分析     

无机偶合流动注射化学发光测定钛的研究

基于钛(Ⅲ)对铬(Ⅵ)氧化I-产生I2的诱导作用,和I2氧化鲁米诺产生化学发光的反应,建立了无机偶合反应流动注射化学发光测定痕量钛的新方法。方法线性范围为1×10-9～1×10-5g/mL,RSD=3.0%(n=11,ρ=1×10-7g/mL),检出限为4.0×10-10g/mL。方法用于人发样品中钛的测定。     

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.