气相色谱法测定蜂王浆制品中的10-羟基-2-癸烯酸

用甲醇提取蜂王浆及其制品中的10-羟基-2-癸烯酸,经衍生化后用气相色谱测定.结果表明,在0～250μg/mL范围呈良好的线性关系,其相关系数为0.9991;蜂王浆冻干粉的加标回收率平均为90.3%,RSD为3.5%;蜂胶软胶囊的加标回收率平均为92.1%,RSD值为3.2%.     

交联壳聚糖分离富集-火焰原子吸收法测定水样中痕量银

以甲醛、环硫氯丙烷为交联剂,由壳聚糖合成了一种新型的交联壳聚糖微球(FCCIS)分离树脂,研究了不同条件下FCCTS对Ag(Ⅰ)的吸附性能.在pH 3.6时FCCTS对Ag(Ⅰ)定量吸附,吸附在树脂上的Ag(Ⅰ)可用0.5 moL/L的氨水将其洗脱,用火焰原子吸收光谱测定.该法对Ag(Ⅰ)的检出限为61 ng/mL(3σ,n=8),相对标准偏差为2.2%(n=7,ρ=2μg/mL),线性范围为0.05～4μg/mL,加标回收率在98.8%～101.7%之间.该法已用于水样中痕量银测定.     

微波消解/干灰化-分光光度法测定面制食品中的铝

采用微波消解法和干灰化法对面制品进行前处理,用分光光度法测定面制品中的铝含量,建立了微波消解/干灰化-分光光度法测定铝的方法.实验结果表明,本方法前处理简单,检测结果准确度高,精密度好,在0～10μg/25 mL线性范围内:相关系数r=0.999 5,方法检出限为0.2 μg/25 mL,样品的加标回收率在92.0 %...     

1,2-萘醌-4-磺酸钠作为显色剂分光光度法测定阿魏酸哌嗪

建立了用1,2-萘醌-4-磺酸钠测定阿魏酸哌嗪的新方法.在pH 13.0的KCl-NaoH缓冲溶液中,阿魏酸哌嗪与1,2-萘醌-4-磺酸钠反应形成红褐色产物,其最大吸收波长为484 nm.阿魏酸哌嗪浓度在0.4～80μg/mL范围内呈现良好线性关系.线性回归方程为A=0.07742+0.01216ρ(μg/mL),线性相关系数r=0.9986,表观摩尔吸光系数5.8×103 L/mol/cm,相对标准偏差(RSD)和检出限分别为0.84%和0.29μg/mL.对药物样品中阿魏酸哌嗪的含量进行测定,平均回收率在95.1%～103.3%.     

硫化镍试金富集-催化光度法测定痕量铑

在铑的硫酸配合物催化高碘酸钾氧化甲基红退色反应的基础上 ,提出了催化光度测定痕量铑的新方法。铑质量浓度在 0～ 0 .1 μg/mL范围内符合比尔定律 ,测定下限为 4× 1 0 - 3μg/mL。对于试样中质量分数为 1 6× 1 0 - 5%Rh的测定 ,RSD为 9 2 %,平均回收率为 89%。测定之前 ,痕量铑用小硫化镍试金富集分离。方法已用于原矿和尾矿中痕量铑的分析。     

高效液相色谱/电化学检测法测定大鼠下丘脑的组胺和5-羟色胺

采用高效液相电化学检测的方法测定了大鼠下丘脑内组胺和5_羟色胺。色谱柱为NUCLEOSILRC18(250mm×4mm ,10μm) ,流动相 :磷酸二氢钠溶液 (25mmol/L ,内含乙二胺四乙酸二钠0.5mmol/L ,辛烷磺酸钠3mmol/L,pH4.8) -乙腈=100∶14(体积比 ) ,流速0.8mL/min,检测电位0.6V。大鼠下丘脑匀浆液经低温高速离心 ,上清液直接进样测定5_羟色胺 ,另取上清液衍生后进样测定组胺。组胺在0.075～1.8μg/mL ,5_羟色胺在0.0625～1.25μg/mL浓度范围内 ,线性关系良好。组胺测定的日内和日间相对标准偏差分别小于1.0%和11.4 %,5_羟色胺测定的日内和日间相对标准偏差分别小于3.4 %和6.3 %,两者回收率分别为94.1 %～102.3%和72.8 %～89.1 %。正常雄性SD大鼠下丘脑内组胺和5_羟色胺的平均含量分别为0.280±0.029μg/mL和0.224±0.068μg/mL。本法简便、准确、快捷 ,可用于大鼠下丘脑内组胺和5_羟色胺的测定     

浊点萃取-高效液相色谱法测定小儿泻速停颗粒中多酚类化合物

建立了基于表面活性剂浊点萃取-反相高效液相色谱法同时分离测定小儿泻速停颗粒中没食子酸、儿茶素、表儿茶素的方法。采用phenomenex C18色谱柱,流动相为乙腈-0.2%冰乙酸水溶液,采用梯度洗脱;流速0.8 mL/min;检测波长280 nm。没食子酸、儿茶素和表儿茶素分别在0.0104～223μg/mL,(r=0.9999);0.0152～108μg/mL,(r=0.9999);0.0184～132μg/mL,(r=0.9999)范围内线性关系良好,定性检测限(S/N=3)依次为:0.087 ng/mL,0.43 ng/mL,0.42 ng/mL。加入50 g/L NaCl来进行浊点富集,可提高萃取回收率。平均回收率为91.85%～98.48%,本方法可用于该制剂的质量控制。     

电感耦合等离子体原子发射光谱（ICP-AES）法测定铜阳极泥中的金含量

实验采用某铜冶炼生产企业的铜阳极泥样品,对其中的金含量进行测定。用王水溶解样品,王水(3%)定容至100 mL容量瓶中,用电感耦合等离子体原子发射光谱法测定。实验表明,选择Au242.795nm为分析谱线,方法检出限为(n=11)0.09μg/mL,测定下限为0.27μg/mL,加标回收率在97%～107%,线性相关系数为0.999 928,分析结果满足要求。     

光化学-荧光分析法研究(Ⅷ)——波长扫描-反应速差分析法

提出了波长扫描-光化学反应速差荧光分析同时测定双组分的方法,以核黄素的光分解反应和甲萘醌的光还原反应为例考察了方法的可行性.结果表明,核黄素、甲萘醌浓度分别在(0～1.20)μg/mL和(0～2.70)μg/mL范围内呈良好的线性关系(γ为0.999和0.998).检出限分别为0.22ng/mL和2.6ng/mL(n=11).平均回收率分别为101%、99%.     

蒙脱石-石墨-聚氯乙烯复合电极测定制药废水中苯酚

报道了当制药废水PH8．0时，用蒙脱石－石墨－聚氯乙烯复合电极可以直接测定苯酚的含量而不受水杨酸存在的干扰，苯酚浓度在1．0μg/mL-25.0μg/mL范围内峰电流与浓度有良好的线性关系，I＝1．262c-0.046，相关系数r=0.998，检出限为0．1μg/mL，用该方法测定模拟制药废水中苯酚，其平均回收率为101．7％。     

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.