共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
磁性固相萃取在食品安全检测中的应用进展 总被引:1,自引:0,他引:1
本文介绍了磁性固相萃取技术,综述了近5年来磁性固相萃取技术在食品中重金属、农药、兽药、合成色素及其他有机污染物残留检测中的应用进展,并展望了磁性固相萃取技术的发展方向(引用文献56篇)。 相似文献
3.
4.
5.
6.
固相微萃取是一种新型的萃取分离技术. 由于它具有富集能力强、分析速度快、操作简便及便于现场分析和仪器联用等优点,成为痕量物质分离检测分析的重要工具. 固相微萃取技术的核心是固相微萃取纤维. 总结了固相微萃取纤维在稳定性、使用寿命及选择性方面的一些特点,并综述了近年来在这些方面所进行的研究工作及发展方向. 相似文献
7.
8.
综述了雌二醇分子印迹聚合物的基础理论、制备方法、结构表征及其在固相萃取、固相微萃取、人工膜、传感器等方面的应用,介绍了雌二醇分子印迹技术在残留检测及污染物去除方面的应用,并对雌二醇分子印迹技术的发展进行了展望(引用文献72篇)。 相似文献
9.
10.
固相萃取技术分离富集食品和环境水中铅的应用进展 总被引:1,自引:0,他引:1
综述了固相萃取的基本原理、固相萃取吸附材料和离子印迹技术,评述了固相萃取技术分离富集食品及环境水中铅的应用情况(引用文献44篇)。 相似文献
11.
限进介质固相萃取及其应用 总被引:5,自引:0,他引:5
系统地介绍了限进介质固相萃取的原理、特点、发展现状及其发展趋势,并对该技术在生物和环境样品前处理中的应用作了较详细的综述。引用文献58篇。 相似文献
12.
13.
分子印迹聚合物具有抗恶劣环境、选择性高、稳定性好等特点,广泛应用于复杂样品的前处理。采用结构类似物作为替代模板分子,可以解决分子印迹聚合物制备时目标物溶解性差的问题,替代模板分子印迹聚合物不仅对目标分析物具有选择性识别能力,还可以避免模板泄露对痕量分析造成的影响。本文综述了替代模板分子印迹技术在样品前处理中的应用进展,包括替代模板分子印迹技术在固相萃取、固相微萃取、色谱固定相、基质固相分散萃取中的应用,最后对替代模板分子印迹技术在未来的样品前处理中的研究进行了展望。 相似文献
14.
Jacqueline Loisel Jean-Paul Pinan-Lucarre Vincezo Lorenzelli 《Journal of Molecular Structure》1973,17(2):341-354
Recent X-ray determination of the structure of solid furan allowed us to reexamine its fundamental vibrations. Analysis of the low temperature phase spectrum has been facilitated by comparisons with the spectra of the liquid, the high temperature solid phase and in an inert gas matrix. An analogous study has been performed for thiophene in the liquid phase and in the four solid phases. We suggest a quadratic structure to account for the crystalline cell of the solid (IV) phase. 相似文献
15.
Effect of matrix physical characteristics on the reactivity and reaction pathways of organic radical cations in ground and
excited states in solid phase is considered. The analysis of the results obtained using solid rare gas matrices (argon, krypton,
and xenon) showed the ionization potential and polarizability of the matrix to determine to a considerable extent the fate
of organic radical cations resulting from charge transfer. In some cases, the matrix control of this kind may lead to nearly
complete “switching” between the reaction channels upon changing one inert matrix for another. Data on the mechanism and efficiency
of the reactions of electronically excited radical cations in solid phase (freons, sulfur hexafiuoride) were analyzed. It
was shown that the matrix effects also had strong influence on the selection of specific reaction pathways and their efficiency
in this case 相似文献
16.
17.
Molecularly imprinted polymers prepared by Pickering emulsion method with lignin as stable particle were used as dispersants in matrix solid‐phase dispersion, followed by ultra high performance liquid chromatography with tandem mass spectrometry to research the degradation behavior of matrine in soil. The molecularly imprinted polymers have regular morphology and uniform particles. Moreover, the adsorption experiments and the conditions of matrix solid‐phase dispersion were discussed. With the optimal conditions of matrix solid‐phase dispersion, the recoveries of matrine were 95.4–98.2%, relative standard deviations were 0.6–5.1%, and the detection limit was 5 ng/g. Moreover, the degradation behavior of matrine in soil was researched, it indicated the half‐life of matrine was 2.7–3.2 days, and it was an environmentally friendly botanical pesticide. The method was successfully applied to separate and analyze matrine in soil samples can decrease analysis time, save organic solvents, and improve the selectivity. 相似文献
18.
Zuofu Wei Youzhi Pan Lu Li Yuyang Huang Xiaolin Qi Meng Luo Yuangang Zu Yujie Fu 《Journal of separation science》2014,37(21):3045-3051
A method based on matrix solid‐phase dispersion extraction followed by ultra high performance liquid chromatography with tandem mass spectrometry is presented for the extraction and determination of phenolic compounds in Equisetum palustre. This method combines the high efficiency of matrix solid‐phase dispersion extraction and the rapidity, sensitivity, and accuracy of ultra high performance liquid chromatography with tandem mass spectrometry. The influential parameters of the matrix solid‐phase dispersion extraction were investigated and optimized. The optimized conditions were as follows: silica gel was selected as dispersing sorbent, the ratio of silica gel to sample was selected to be 2:1 (400/200 mg), and 8 mL of 80% methanol was used as elution solvent. Furthermore, a fast and sensitive ultra high performance liquid chromatography with tandem mass spectrometry method was developed for the determination of nine phenolic compounds in E. palustre. This method was carried out within <6 min, and exhibited satisfactory linearity, precision, and recovery. Compared with ultrasound‐assisted extraction, the proposed matrix solid‐phase dispersion procedure possessed higher extraction efficiency, and was more convenient and time saving with reduced requirements on sample and solvent amounts. All these results suggest that the developed method represents an excellent alternative for the extraction and determination of active components in plant matrices. 相似文献
19.
S. B. Savvin V. P. Dedkova V. V. Minin A. V. Mikhailova O. P. Shvoeva 《Russian Journal of Inorganic Chemistry》2008,53(5):765-771
Diffuse reflectance and EPR spectroscopic data are reported for the formation of vanadium complexes with the organic reagents (ORs) sulfochlorophenol S (SCP) and pyridylazoresorcinol (PAR) on the solid phase of polyacrylonitrile fiber filled with the cation exchanger KU-2 or the anion exchanger AV-17 or A-5. The effects of the order of sorption of the reaction components, sorption conditions, and the V: OR ratio on the complexation process are discussed. The characteristics of the complexes obtained on the solid phase and in solution are compares. Both M : OR = 1 : 1 and M : OR = 2 : 1 SCP complexes can form on the solid phase without involving any croups of the matrix. PAR forma a 1 : 1 complex involving groups of the A-5 matrix. 相似文献