3-(4-酮基苯甲酸)-2-喹啉甲醛衍生氨基酸的高效毛细管电泳-激光诱导荧光检测分析

1引言在众多的神经递质中，兴奋性和抑制性氨基酸一直是神经科学中所关注的生化指标。兴奋性氨基酸如谷氨酸（Glu）、天门冬氨酸（Asp）和抑制性氨基酸γ-氨基丁酸（GABA）、甘氨酸（Gly）等在体内具有广泛的生理意义。牛磺酸（Tau）不仅是神经递质，而且具有调节机体的作用。氨基酸在血和脑脊液中的含量较低，大部分氨基酸由于无紫外吸收，在分析过程中常用柱前和柱后衍生氨基酸的方法使之具有紫外或荧光性，3－（4-酮基苯甲酸）－2－喹啉甲醛（CBQCA，3－（4-carboxybenzoyl）－2-quinolinecarbox-aldehyde）为新的柱前氨基酸类衍生…     

邻苯二甲醛-尿素柱前衍生高效液相色谱法快速检测枸杞中牛磺酸

干枸杞经粉碎、匀浆、离心后,通过阳离子交换柱脱去样品中其它氨基酸,再通过Ｚｏｒｂａｘ－Ｃ８柱进行柱前衍生分离。衍生剂：Ａ．４％ＯＰＡ甲醇溶液;Ｂ．尿素∶磷酸钠盐缓冲液（ｐＨ６．８）＝１∶３（Ｗ／Ｖ）。流动相：甲醇∶０．０１ｍｏｌ／Ｌ乙酸钠溶液（ｐＨ６．８）＝３５∶６５（Ｖ／Ｖ）。紫外检测波长３３０ｎｍ。牛磺酸浓度在０．１～１．０ｍｍｏｌ／Ｌ范围内可被定量测定。回收率可达１００．３１％±１．９８％,变异系数（ＣＶ）为１．９４％。     

光学异构体的气相色谱拆分法

光学异构体的气相色谱拆分法曾苏,章立,沈向忠,刘志强（浙江医科大学药物分析教研室杭州３１００３１）１前言药物对映体的拆分是医药工业和药物分析领域的重要课题之一。药物的消旋体引入人体内后,其对映体分子均由体内具手性的蛋白质、酶和受体以两个完全不同的分子处理。因而,药物对映体在体内可具有不同的代谢途径和药理作用。研究和临床实践表明：药物光学异构体的疗效与毒性均可有差异。如ＤＬ－（±）－合霉素的治疗效果仅为Ｄ－（—）－、氯霉素的一半;Ｓ－（＋）－海索比妥的催眠作用强于Ｒ（—）－对映体;Ｓ（—）－、氧氟沙星的抗菌...     

从呋喃甲醛制备4－(1,2－亚乙二氧基)环己酮的系列合成

从呋喃甲醛制备４－（１，２－亚乙二氧基）环己酮的系列合成蒋本国，葛树丰，叶秀林（北京大学化学与分子工程学院１００８７１）４－（１，２－亚乙二氧基）环己酮（５）及其脱羧前的母体化合物４－（１，２－亚乙二氧基）环己酮－２－羧酸乙酯（４）都是反应性能很强的...     

马铃薯体内腺嘌呤代谢物的薄层色谱法

马铃薯体内腺嘌呤代谢物的薄层色谱法乌云,李秉真,田瑞华,索兰弟,刘梦云（内蒙古农牧学院中心实验室农学系呼和浩特０１００１８）１前言在研究马铃薯块茎的形成和细胞分裂素的变化的相互关系时,除发现有玉米素、玉米素核苷外〔１〕,还发现有６－氨基嘌呤、腺嘌呤核...     

异丙基桥连的希夫碱及其锰（Ⅲ）络合物催化剂的红外光谱

研究了异丙基桥连的希夫碱及其锰（Ⅲ）络合物催化剂的红外光谱（３８００￣１５０ｃｍ＾－１），对一些主要吸收谱带进行了经验归属。配体内氢键谱带出现在３４４６ｃｍ＾０１附近（以ＬＨ为例），ｖｃ－０谱带在１７２４ｃｍ＾－１附近（以ＬＣ为例，下同），ｖｃ＝Ｎ谱带在１６４９和１６２９ｃｍ＾－１附近，苯环的特征谱在１６０１，１４７０和７５３ｃｍ＾－１附近，ｖＭｎ－Ｎ为主的复合振动在３６３ｃｍ＾－１附近，δＭｎ－     

小檗碱的药物代谢动力学

小檗碱是中药三棵针的主要有效成分之一，为了研究小檗碱的药物代谢动力学，本文采用胶束增敏荧光法对小檗碱在兔体内的血药浓度进行２４ｈ监测，求出毓药物代谢动力学参数，结果表明小檗碱在动物体内的Ｋａ为１．６３７ｈ＾－１，ｔ１／２（α） ０．３８６９ｈ，ｔ１／２（β）为６．７６ｈ，Ｋ２１为０．１５５３ｈ＾－１，Ｋ１２ｏ ０．０３８４ｈ＾－１，ＡＵＣ为２１１。９４μｇ．ｈ／ｍｌ。     

[Cu(HDPC)_2]·(HO_x)_2·6H_2O的合成及晶体结构

铜是重要的生命元素,它与铁一样能起到输送氧气和电子载体的作用。把铜的配合物作为生物体内金属离子／酶／底物间相互作用的模拟研究一直十分活跃犤１～４犦。我们选取Cu?与吡啶－２,６－二甲酸（H２DPC）和８－羟基喹啉（HOx）,合成了配合物犤Cu（HDPC）２犦·（HOx）２·６H２O,并获得其单晶,测定了其晶体结构,讨论了存在于体系中的氢键作用。１实验部分１．１配合物的合成先将１mmolH２DPC用NaOH（１mmol·L－１）溶液调配成pH＝７．０的钠盐,然后滴加１０mL溶有１mmolHOx的９５％乙醇溶液,在搅拌下,上述混合液慢…     

微量元素与体内自由基反应的多元分析

食管癌患者体内环境与正常人的差异,表现在体内自由基反应的相关因子的含量不同,选取有关的生化指标作统计学分析,结果显示：（１）单相关分析有统计学意义的指标是Ｃｕ,Ｃｄ,Ｓｅ,Ｍｎ－ＳＯＤ,ＭＤＡ,ＧＳＨ－Ｐｘ,Ｃｕ／Ｚｎ,Ｚｎ／Ｃｄ;（２）逐步回归分析,建立回归方程：ｙ＝３．９８９０＋２．２３９９ｘ（Ｃｕ）－２２．４９ｘ（Ｃｕ／Ｚｎ）－０．０５０３ｘ（ＭＤＡ）－０．４３３５ｘ（Ｃｄ）。以此方程作两值     

4－（6－甲基－2－苯并噻唑偶氮）间苯三酚反相高效液相色谱分离测定钒钴镍铬

作者以新研制的４－（６－甲基－２－苯并噻唑偶氨）间苯三酚为柱前衍生试剂，用含１０ｍｍｏｌ／Ｌ的ｐＨ６．８０的ＨＡｃ－ＮａＡｃ缓冲溶液，１０ｍｍｏｌ／ＬＴＢＡ·Ｂｒ和１×１０￣（－４）ｍｏｌ／ＬＥＤＴＡ的甲醇－水溶液（７８：２２，Ｖ／Ｖ）作流动相，在Ｃ＿（１８）柱上，１１ｍｉｎ内反相ＨＰＬＣ分离测定了Ｃｒ（Ⅵ），Ｖ（Ⅴ）Ｃｏ（Ⅱ），Ｎｉ（Ⅲ）。当Ｓ／Ｎ＝３时，其检出限分别是Ｖ（Ⅴ）５．４５ｎｇ，Ｃｏ（Ⅱ）１．０９ｎｇ，Ｎｉ（Ⅱ）１．５０ｎｇ，Ｃｒ（Ⅵ）１．７０ｎｇ。     

气相色谱-质谱法测定水中有机含磷农药前处理方法比较

用气相色谱-质谱法测定了水中6种有机含磷农药残留量,并比较了全自动固相萃取(方法1#)和全自动液-液萃取(方法2#)两种样品前处理方法。结果表明:从准确度方面,方法1#优于方法2#,所测得的方法1#的回收率在73.5%～92.0%之间,而方法2#的回收率在63.7%～89.7%之间;但方法2#耗时较方法1#少。     

Substoichiometric determination of phosphorus

Phosphorus in orchard leaves (NBS SRM-1571) and spinach (SRM-1570) was determined by various substoichiometric analytical methods such as the direct method, GRASHCHENKO's method and the method of carrier amount variation. All samples were labelled with³²P radioisotope. The data obtained by the method of carrier amount variation were also treated by the method of least squares instead of De VOE's method. Phosphorus concentration in orchard leaves was 0.206±0.011% by the direct method, 0.219±0.011% by GRASHCHENKO's method, 0.211±0.011% by the method of carrier amount variation and 0.207±0.007% by the method of least squares, respectively. These values agree with the value reported by NBS (0.21±0.01%). Furthermore, these concentrations obtained by various substoichiometric methods were compared with those by radioactivation reported in a prevoius paper.     

Disintegration test to measure lot-to-lot variations of vaginal tablets

Attempts were made to investigate the disintegration test for vaginal tablets. Disintegration tests were done for four different commercial vaginal tablets (three lots each) by the watch glass method and Japanese Pharmacopoeia (JP) disintegration method, and the resulting profiles were compared to those by the modified British Pharmacopoeia (BP) method on a point of lot-to-lot variation of the disintegration times. The disintegration time of every tablet by the modified BP method was longest, followed by the watch glass method, and finally by the JP disintegration method. The results for lot-to-lot differences in disintegration times by the modified BP method were similar to those by the watch glass method. However, such lot-to-lot differences as found by the modified BP method and watch glass method were not always observed by the JP disintegration method. It was concluded from these results that the modified BP method was most suitable for investigating lot-to-lot differences in the disintegration of vaginal tablets.     

负载Ni金属有序介孔氧化铝催化剂的制备及表征

采用原位合成法和传统浸渍法以价格低廉的硝酸铝作为铝源, 聚乙二醇1540为模板剂, 硝酸镍为镍源, 制备出负载Ni金属有序介孔氧化铝催化剂, 并采用BET、TEM、XRD、TG多种测试技术对合成催化剂的物理化学性质和结构特征进行了表征. 实验结果表明, 两种方法均能制备出比表面积大(＞210 m2·g-1)、孔径分布窄(4 nm左右)的负载Ni金属介孔氧化铝催化剂. 与浸渍法相比, 原位合成法所制备的负载Ni金属有序介孔氧化铝镍离子与载体具有更强的相互作用力, 且孔结构具有一定的有序性.     

New refractive index method for measurement of alcoholic strength of small volume samples

A study of the correlation between the refractive index (RI) method adopted by the European Community (EC) and a reference pycnometric method for the measurement of alcoholic strength was undertaken. A new RI method with greater accuracy was also developed. Alcoholic strength measured by both RI methods presented a relatively constant negative bias compared with results by the pycnometric method. Differences found between the RI methods and the pycnometric method were 0.6-0.9% (v/v) when RI was measured by the EC method and 0.4-0.5% (v/v) when the new RI method developed in our laboratory was used. Statistical analysis of the results showed that differences between the 2 RI methods and the reference pycnometric method were statistically significant at the 95% confidence level. Correction factors are proposed for the accurate use of measurements of alcoholic strength obtained for small volume samples.     

Dependence of the molecular aggregation state of octadecylsiloxane monolayers on preparation methods

The molecular aggregation state of octadecylsiloxane monolayers on Si-wafer substrate surfaces prepared from octadecyltrimethoxysilane (OTMS) or octadecyltrichlorosilane (OTS) was investigated on the basis of grazing incidence X-ray diffraction (GIXD), Fourier transform infrared spectroscopy (FT-IR), contact angle measurement, field emission scanning electron microscopy (FE-SEM), and scanning force microscopy (SFM). The OTMS monolayer was prepared by using the chemical vapor adsorption (CVA) method, and the OTS monolayers, which were used as reference samples, were prepared either by chemisorption (OTS-S) or by the water-cast method (OTS-W). The GIXD, FT-IR, lateral force microscopic (LFM) measurements, and FE-SEM observation revealed that the alkyl chains in the OTMS monolayers prepared using the CVA method are in an amorphous state at room temperature. According to the LFM measurement, the transition temperature from the hexagonal crystalline phase to the amorphous phase was found to be ca. 333 K for the OTS-S monolayer prepared by the chemisorption method. However, the phase transition was not observed in the OTMS monolayer prepared by the CVA method. Also, the atomic force microscopic (AFM) observation and the contact angle measurement showed that the OTMS monolayer prepared by the CVA method has a uniform surface when compared to the OTS monolayers. These results indicated that organosilane compounds in the monolayer prepared by the CVA method were immobilized on the Si-wafer substrate surface in an amorphous state, which was quite different from the hexagonal crystalline state obtained by the chemisorption and water-cast methods.     

汽油族组成的近红外光谱快速测定

以荧光指示剂吸附色谱法（FIA）测定汽油族组成结果为基础，采用近红外光谱和化学计量学方法建立了快速、准确测定催化裂化馏出口汽油族组成（饱和烃、烯烃和芳烃）的分析模型；试验表明，该法分析速度快、重复性好、成本低，特别适用于生产中间控制分析。     

Synthesis of radioiodinated labeled peptides

This report covers optimization of radioiodination of peptides by both a direct method in which a constituent tyrosine residue is labeled and indirect method by using an iodinated derivative (SIB) of N succinimidyl 3-(tri-n-butylstannyl) benzoate (ATE) as the intermediate. Radioiodination of IgG and FMLF were performed by direct method using Chloramine-T as an oxidant but since Formyl-Methyl-Leucyl-Phenylalanine, FMLF, does not lend itself for direct radioiodination we performed labeling of FMLF by indirect method via radioiodined SIB at different pH.     

A Coulometric Analysis Method and an Ion-exclusion Chromatographic Method for the Determination of Antimony(V) in Large Excess of Antimony(III)

A coulometric analysis method and an ion-exclusion chromatographic method were developed for the determination of antimony(V) in a large excess of antimony(III). Antimony(V) reacted with potassium iodide in a high concentration hydrochloric acid; the liberated iodine was determined by the standard-addition method using coulometrically generated iodine. Using a Dionex ICE-AS1 ion-exclusion column, antimony(V) was eluted with 40 mmol/L sulfuric acid; on the other hand, antimony(III) was strongly retained on the column. The content, expressed as the amount ratio of antimony(V) to antimony(III), was 0.035% in a 10 g/kg antimony(III) solution prepared from an antimony(III) oxide reagent by the coulometric analysis method and 0.036% in a 1 g/kg antimony(III) solution prepared from the same antimony(III) oxide by the ion-exclusion chromatographic method. The results of both methods were in good agreement with each other. The detection limit of antimony(V) in antimony(III) oxide by the former method was 0.004% of antimony(III), and that by the latter method was 0.002% of antimony(III).     

固相合成胸腺五肽(TP5)

采用Fmoc固相多肽合成中的活化酯方法和2,6-二氯苯甲酰氯(DCB)混合酸酐法, 对Fmoc-Tyr(t-Bu)-OH与Wang树脂反应中的反应级数和表观活化能进行了研究, 并采用常规方法和微波强化方法分别进行了胸腺五肽的合成. 实验结果表明, 活化酯方法的反应级数为1.855, 表观活化能15.24 kJ/mol, 混合酸酐法的表观活化能为35.14 kJ/mol. 与传统方法相比, 微波将缩合反应速率提高了30倍以上, 氨基酸过量倍数也从传统的三倍降低到两倍.