荧光法研究金属络合物与脱氧核糖核酸的相互作用

研究了Tb(phen) 2 Cl3 ·H2 O·CH3 CH2 OH与小牛胸腺脱氧核糖核酸 (DNA)的作用方式 ,结果表明 :它们之间的作用存在两种模式 :嵌入与静电作用。运用Tb(phen) 2 Cl3 ·H2 O·CH3 CH2 OH作荧光探针初步研究了Ni(phen) 3 (ClO4) 2 ·3H2 O的两种手性对映体与DNA的相互作用 ,结果表明 :这两种对映体的作用存在差别     

9-Bromomethylacridine a Novel Fluorescent Labeling Reagent of Carboxylic Group for HPLC

Abstract

9-Bromomethylacridine (9-Br · Ma) gave blue fluorescent 9-acridinylmethyl (9-AM) esters by the reaction with carboxylic acids. The reactions were performed simply by mixing the 9-Br · Ma, tetraethylammonium carbonate (TEA C) and carboxylic acids in N,N-dimethylformamide at room temperature. The 9-AM derivatives of fifteen kinds of fatty acids were separated and detected with high performance liquid chromatography. By this method, fatty acids could be determined at levels down to either pmol order by fluorometry or 10 pmol order by UV method. After saponification, those in triacylglycerols were also determined. When four kinds of fatty acids were added to a butter, their recoveries were 92–101%. The coefficient of variation of myristate as a representative was 2.5% (42.8 pmol, n=6).     

钙黄绿素-Al3+荧光光谱法测定F-

报道了F-的荧光光谱测定法.在pH=8.9的缓冲液中,加入Al3 与荧光试剂钙黄绿素反应导致荧光猝灭,而再加入F-后,则F-与Al3 形成比钙黄绿素-Al3 更稳定的配合物,从而使钙黄绿素游离出来而使体系荧光增强,其荧光的增强与F-浓度在1.0×10-4-1.0×10-3mol/L范围内有较好的线性关系,据此可间接测定F-含量.     

Sensitive and selective detection of aspartic acid and glutamic acid based on polythiophene-gold nanoparticles composite

In recent years, gold nanoparticles and water-soluble fluorescent conjugated polymers are promising materials in terms of their potential applications in a variety of fields, ranging from monitoring DNA hybridization to demonstrate the interaction between proteins, or detecting diseased cell, metal ions and small biomolecular. In order to exploit some new properties of the both, many attempts have been devoted to achieve nanoparticle-polymer composite via incorporating metal nanoparticle into polymer or vice versa, however, only few of them are put into practical application. In the present paper, we utilize the “superquenching” property of AuNPs to polythiophene derivatives for detecting aspartic acid (Asp) and glutamic acid (Glu) in pure water, and discuss the factors accounting for fluorescence quenching and recovery via modulating pH. Thus an exceptionally simple, rapid and sensitive method for detecting Asp and Glu is established with a limit of detection (LOD) is 32 nM for Asp and 57 nM for Glu, the linear range of determination for Asp is 7.5 × 10⁻⁸ M to 6 × 10⁻⁶ M and 9.0 × 10⁻⁸ M to 5 × 10⁻⁶ M for Glu. The system is applied to real sample detection and the results are satisfying. Otherwise the composite is very sensitive to pH change of solution, we expect it will be possible to use as pH sensor with wide range in the future.     

电化学衍生-高效液相色谱和荧光光度法检测花生酱中的黄曲霉毒素

建立了免疫亲和柱净化-柱后电化学衍生-高效液相色谱结合荧光光度法检测花生酱中4种黄曲霉毒素(B1、B2、G1和G2)的方法。样品经过体积分数为60%的甲醇提取,通过免疫亲和柱净化后,以KobraCell装置柱后衍生,高效液相色谱法分离定量。黄曲霉毒素B1、B2、G1和G2能达到完全的基线分离,检测限分别为0.5、0.15、0.5和0.15μg/kg,线性相关系数0.999,回收率可达74.2%～96.5%,相对标准偏差低于11%。该方法能够满足花生酱中黄曲霉毒素检测的需要。     

紫花地丁中汞的原子荧光法测定

利用还原气化的非色散型装置，以湿法消解的方式，建立了原子荧光测定紫花地丁中痕量汞的测定方法，同时比较了不同玻璃仪器的洗涤方法和不同的定量方法，试验回收率在86．9％－110．8％之间，误差＜8．5％，通过对实际样品的测定，得到了满意的结果。     

Fluorometry of hydrogen peroxide using oxidative decomposition of folic acid

Hydrogen peroxide (H₂O₂) is one of the most important reactive oxygen species. In the present study, a fluorometry method for detecting H₂O₂ utilizing folic acid was evaluated. Folic acid was decomposed by H₂O₂ in the presence of Cu(II) into pterine-6-carboxylic acid, leading to strong fluorescence enhancement. In the absence of the metal ion, superoxide and H₂O₂ could not decompose folic acid. Also, H₂O₂ plus sodium hypochlorite (a source of singlet oxygen) could not induce fluorescence enhancement. These results demonstrate that H₂O₂ can be selectively detected using folic acid plus Cu(II). The limit of detection (LOD; at S/N=3) for H₂O₂ is 0.5 μM. This method based on the fluorescence enhancement of folic acid was applied in order to determine small amounts of H₂O₂ generated through the autooxidation of semicarbazide (generation rate: ∼0.01 μM min⁻¹), a carcinogenic compound.      

荧光光谱法研究卟啉与金属离子配位反应机理初探

本文用荧光光谱法初步研究了卟啉与金属离子配位反应机理和部分催化剂的催化机理.实验发现,在一定条件下,卟啉以一种与其主要存在形式不同的变形体H₂P^*存在,根据H₂P^*的存在和产生的条件,对卟啉与金属离子配位反应的一般条件作出了较为满意的阐述.