金表面吖啶橙自组装膜制备及其对蛋白质测定

借Au-S的作用,将半胱氨酸组装在金表面上,利用吖啶橙与半胱氨酸之间静电的作用,将荧光试剂吖啶橙间接组装于金表面,构建的AO/L-Cys/Au双层膜具有强的荧光信号.利用吖啶橙与蛋白质间的相互作用,引起膜表面荧光信号灵敏的变化测定蛋白质,对蛋白质检测下限为2.301×10~(-8)g/L.     

茶叶资源化利用及对染料废水的去除

采用紫外可见分光光度法研究经2.0 mo/L HCl预处理的茶叶粉末对甲基紫溶液的吸附作用,探讨在不同pH值、初始浓度和吸附时间条件下,不同用量的吸附剂对甲基紫溶液的吸附效果.结果表明,当pH为10.0时,250mg预处理的茶叶粉末对20mg/L,50mL的甲基紫吸附20min,去除率达98%,饱和吸附量为180.6mg/g.     

Determination of both jasmonic acid and methyl jasmonate in plant samples by liquid chromatography tandem mass spectrometry

An efficient method for the simultaneous extraction and quantification of both jasmonic acid (JA) and methyl jasmonate (MeJA) from a single plant sample was developed. Plant tissues were firstly extracted by using 100% cold methanol, then the Sep-pak C₁₈ solid-phase extraction (SPE) cartridges were adopted for the purification of sample extract, and finally JA and MeJA were deter-mined by the liquid chromatography tandem mass spectrometry (LC-MS-MS) system. It was found that the accuracy was improved by using the extra standard for the estimation and correction of JA and MeJA losses in the extraction and purification process. The detection limits for JA and MeJA were 0.03 and 0.075 ng mL⁻¹, respectively, and the average recovery rate of JA and MeJA was 92.48% and 94.30%. The method was found to be reproducible and selective, yielding well isolated and easily detectable peaks for both JA and MeJA and simplifying the time-consuming extraction and purification. High-performance liquid chromatography (HPLC) system was employed as the control detection method for the LC-MS-MS system. The two systems were compared in their specificity and accuracy.     

V (Ⅴ)-KIO4-甲基红体系动力学光度法测定微量钒

研究了在柠檬酸介质中,钒(Ⅴ)强烈地催化高碘酸钾氧化甲基红的褪色反应,建立了催化动力学光度法测定微量钒(Ⅴ)的方法.钒质量浓度在0.64～3.20 μg/mL范围内与log(A₀/A)呈线性关系,检出限为3.75×10^-3 μg/mL.该方法用于提钒废水中钒的测定,结果满意.     

椰子油为原料酶法制备脂肪酸甲酯

以椰子油为原料利用固定化Candida antarctica sp.99-125脂肪酶转酯化制备了脂肪酸甲酯。分析了椰子油的脂肪酸组成,并测定了椰子油平均分子量,考查了关键因素对反应的影响及反应历程。实验结果表明:椰子油平均分子量为655.27;最优反应条件为:酶最小加入量为20%,水加入量为15%,正己烷加入量为4mL/2 g椰子油。此反应条件下原料油转化率达到90%。     

辉光放电等离子体处理二甲酚橙废水研究

辉光放电电解是一种新型的产生等离子体的电化学方法,采用辉光放电等离子体技术对二甲酚橙模拟废水进行了降解脱色处理,考察了多种因素对其降解效果的影响.实验结果表明,在波长433.8nm时,降解60min后,无催化剂时脱色率达到61.43%,在加入催化剂Fe2+和Mn2+时降解率达到92.72%和80.69%.     

氰乙酸甲酯的合成

提高减压蒸馏氰乙酸水溶液的水浴温度,并在氰乙酸与甲醇在酸性条件下回流后采用加苯除水,再加浓硫酸回流的方法,使氰乙酸甲酯的摩尔产率达到85%以上.     

交联壳聚糖／铜（Ⅱ）／亚硫酸钠体系引发甲基丙烯酸甲酯聚合

交联壳取聚糖／Ｃｕ＾２＋／亚硫酸钠体系能够在室温下于水溶液中引发甲基丙烯酸甲酯聚合。单位时间内单体的转化离随反应温度，膜内交联剂的含量，亚硫酸钠浓度的增加而增加。产物的分子量随温度的升高而降低，反应机理符合自由基聚合机理。     

用冠醚催化的黄鸣龙改进法合成胆石酸

以来源丰富的猪去氧胆酸甲酯(Ⅳ)为原料,经选择性氧化得C_6—酮(V),产率64％.将C_6—酮与水合肼反应成腙后加入18—冠—6和KOH分解腙,制得了胆石酸(Ⅶ),产率70％.