脂质体免疫裂解试验检测人血清胰岛素的初步研究

建立补体介导的脂质体免疫裂解试验（ＬＩＬＡ）以检验人血清中胰岛含量。应用逆上蒸发法（ＲＥＶ）制备包裹有丽丝胺罗丹明Ｂ的大单层脂质体（ＬＵＶｓ），通过碳二亚胺（ＥＤＣＩ）法偶联胰岛素抗原、一定量抗体，在补体参与下，建立竞争抑制测定模式。结果，丽线胺罗丹明Ｂ吸光度值的改变与血清中胰岛素浓度呈线性关系，回归方程为，Ｙ＝２２７．７２－８０．４４１Ｘ（ｒ＝－０．９９６６），批内变异系数（ＣＶ）为３．８％￣８     

尿中碘的过硫酸铵消化-砷铈催化分光光度测定方法

目的 介绍修订后的尿碘测定标准新方法，即尿中碘的过硫酸铵消化．砷铈(As^3 、Ce^4 )催化分光光度测定方法，建议各级实验室应尽快应用。方法 按“研制生物样品监测检验方法指南”(WS/T68-1996)的规定，对我国现行的尿碘测定方法标准进行了修订，并对修订后的新方法进行方法学评价。结果 修订后的新方法尿碘检测范围为0～300μg/L；最低检测量为3μg／L(取样量为0．25m1)；精密度：测定尿碘为63．3、129．8、252．5μg/L时，变异系数(CV)分别为5．5％、2．8％、4．4％(n=6)；准确度：对低、中、高碘3种尿样加碘标平均回收率分别为101．3％、97．6％、95．8％(n=6)，总平均回收率为98．3％(范围：92．6％～107．0％)；测定低、高2种尿碘标准物，其结果与给定值的相对偏差分别为4．9％和1．0％(n=6)；该方法的砷铈反应除了在水浴控温条件下进行，还可以直接在20～35℃之间某一稳定的室温条件下进行测定。结论 修订后的新方法比原标准方法更加简便易操作，并提高了测定的精密度和准确度。     

银杏叶提取物总黄酮含量分析方法的研究

确定银杏叶提取物总黄酮含量测定方法。用紫外可见分光光度法和高效液相色谱法对提取物中的银杏叶总黄酮含量进行测定,并相互比较,确立紫外可见分光光度法为快速、简便、准确的方法,作为银杏叶总黄酮含量测定的常用方法。     

超声波提取法测定茶叶中锌 铁 铜 锰

目的探索超声提取茶叶中Zn、Fe、Cu、Mn 4种元素的最佳试验条件,建立一种方便、快捷地提取茶叶中金属元素的方法。方法分别采用超声波提取和湿消化法提取茶叶样品中的Zn、Fe、Cu、Mn 4种微量金属元素,并用火焰原子吸收光谱法测定样品中各元素的含量,重点考察了超声波提取法中盐酸提取液浓度、超声时间和超声温度对各金属元素提取效率的影响。结果两种前处理方法处理样品后测得结果一致性较好,测定结果的RSD均〈10%,加标回收率均在90%~105%之间。结论湿消化法和超声波提取法均可较好的用于茶叶样品中Zn、Fe、Cu、Mn的提取,而且超声波提取法仅使用稀酸、所需温度低、操作简便快速,是一种值得推广的快速样品前处理方法。     

氧化还原分光光度法测定针剂中头孢他啶含量

目的建立分光光度法测定针剂头孢他啶的新方法。方法采用分光光度法测定高锰酸钾525nm处吸光度的降低情况以测定头孢他啶含量。结果头孢他啶线性范围为0．80～40．00μg／mL,回归方程为△A525=0．01p＋0．0514．相关系数r为0．9987,检出限为0．64μg／mL。结论用于定量分析针剂中头孢他啶的含量,仪器简单,操作简便,选择性好,结果满意。     

Verification of switched liquid crystal eye protection filters

Protective eye-wear which utilizes switched liquid crystal can provide protection for operators using intense pulsed light sources (IPLs). Such eye protection devices combine the properties of useful visual transmittance in the nonactivated state and low light transmission in the active blocking state. The performance of a specific LightSpeed device has been determined using a series of bandpass optical filters coupled to photodiode detectors with signals being captured using a USB interface. Such measurements have allowed key switching parameters of these devices to be determined as part of the process of assessing their effectiveness. Measurements of optical density of transmitting state and blocking state were also determined using a double grating spectroradiometer. A simple model of active filter function was developed and applied to specific IPL pulse profiles.     

Ethyl-propiolate as a novel and promising analytical reagent for the derivatization of thiols: Study of the reaction under flow conditions

The present investigation demonstrates the potentials of ethyl-propiolate (EP), a novel derivatizing reagent for thiols. To the best of our knowledge this is the first systematic study of EP in analytical chemistry. The reaction was investigated under flow conditions using sequential injection (SI) analysis and UV detection at 285 nm. The reaction kinetics was affected by parameters such as the pH, the concentration of EP and the temperature and was thoroughly examined exploiting stopped-flow experiments. Cysteine (CYS) and captopril (CAP) were selected as model thiolic compounds in terms of chemical structures. Finally, the applicability of EP as a derivatization reagent for analytical purposes was demonstrated by the development and validation of a novel automated assay for the determination of CAP in pharmaceuticals.     

不同提取方法菟丝子中总黄酮和微量元素铜含量的相关性分析

目的：通过对不同提取方法菟丝子样品中总黄酮和微量元素铜含量的测定,分析总黄酮与微量元素铜含量之间的相关性。方法：分别采用常规回流法、微波辅助萃取法和石油醚脱脂-索氏提取法对中药菟丝子进行提取,以芦丁为对照品,用紫外分光光度法测定提取液中总黄酮的含量,用原子吸收分光光度法测定提取液中微量元素铜的含量。以总黄酮和微量元素铜的含量为考察指标,探讨中药菟丝子中总黄酮与微量元素铜之间的相关性。结果：微波辅助萃取的样品中总黄酮和微量元素铜的含量均高于其他提取方法,石油醚脱脂-索氏提取的样品中总黄酮和微量元素铜的含量均低于其他提取方法。结论：中药菟丝子中总黄酮的含量与微量元素铜的含量呈正相关关系。     

水及食品中微量镉的微波消解氢化物发生-原子荧光光谱测定法

目的 探讨生活饮用水及食品中微量镉的微波消解氢化物发生原子荧光光谱测定法.方法 样品经微波消解后,以硼氢化钾为还原剂,稀盐酸为载流,加入钴离子,使镉与硼氢化钾反应生成镉的挥发性物质,以原子荧光光谱法进行测定.并探讨了实验条件.结果 方法的线性范围为0.1～100 ng/ml(r＞0.999 3),检出限为0.1 ng/ml,回收率为96.9%～104.0%,RSD为1.54%～2.03%.结论 该方法灵敏度高、选择性好、操作方便、快速,适用于批量样品分析.

Abstract：

Objective To develop a method for the determination of trace cadmium in drinking water or food using microwave digestion-hydride generation-atomic fluorescence spectrometry. Methods The microwave digestion method was used. Cobalt was added in the carrying liquid, the cadmium volatile matter was determined by atomic fluorescence spectrometry. Results The detection limit of this method was 0.1 ng/ml ,the liner range of cadmium was 0.1-100 ng/ml (r>0.999 3), the recovery rate was 96.9%-104.0%,RSD was 1.54%-2.03%. Conclusion The method is simple and rapid, with good sensitivity and selectivity, and it is applicable to the determination of trace cadmium in drinking water or food.     

联苯苄唑凝胶剂含量的紫外测定法

目的探讨用紫外分光光度法测定联苯苄唑凝胶剂的含量。方法用甲醇作提取溶剂，以253nm为测定波长。结果联苯苄唑浓度在2．32—6．96μg/ml范围内线性关系良好（r=0．9999），平均回收率为100．3％，KSD为0．7％。结论该法可用于凝胶剂中联苯苄唑的含量测定。