In this paper, the role of the halogen bond in capillary monolithic column microextraction was explored for the first time. Benzene-1,3,5-tricarbohydrazide (BTH) was synthesized as a functional monomer, N, N'-methylene bisacrylamide (MBA) and divinyl benzene (DVB) were used as cross-linking agents, the hybrid monolithic column of poly (BTH-co-DVB-co-MBA) was prepared using methanol and polyethylene glycol as pore-forming agents and azodiisobutyronitrile as the initiator. Due to the existence of BTH, a large number of nitrogen atoms (Lewis base) were introduced into the monolithic column, which could form a halogen bond with chlorine-containing organic pollutants and enhance its adsorption performance. Based on the monolithic column, a sensitive and environment-friendly solid-phase microextraction technology was studied. The monolithic column was integrated with high-performance liquid chromatography (HPLC) to extract and detect four kinds of chlorophenol in real water samples. Under best conditions, the method showed excellent extraction ability and linearity, with a linear correlation coefficient of 0.9958-0.9987, a low detection limit (LOD) of 0.04-0.23 μg L (S/N = 3), and relative standard deviation (RSD) less than 3.09%. The recovery rate was kept between 87.30% and 123.00%, and the RSD was less than 3.83%, which indicated that the column had powerful capture performance, high precision, and strong anti-matrix interference ability in the real sample, and had potential application value in practical work.
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http://dx.doi.org/10.1016/j.talanta.2022.124150 | DOI Listing |
J Chromatogr B Analyt Technol Biomed Life Sci
January 2025
College of Life Science, Hebei Agricultural University, Baoding, Hebei 071001, China; Hebei Forage Microbial Technology Innovation Center, Baoding, Hebei 071001, China; Hebei Agriculture Waste Resource Utilization Engineering Research Center, Baoding, Hebei 071001, China. Electronic address:
s: This study aimed to prepare a new separation medium, silane coupling agent KH570- modified halloysite nanotube (MPS-HNT) monolithic column, with excellent separation performance for small molecular compounds and macromolecular proteins. This was prepared using the principle of redox polymerization with modified HNTs as monomers. The optimal monomer proportion was obtained by optimizing the ratio of monomer, cross-linker, and pore-forming agent, which was evaluated using scanning electron microscopy, nitrogen adsorption, and mercury intrusion.
View Article and Find Full Text PDFGels
December 2024
Institute of Natural Sciences and Technosphere Safety, Sakhalin State University, 693000 Yuzhno-Sakhalinsk, Russia.
A new composite material with enhanced sorption-selective properties for uranium recovery from liquid media has been obtained. Sorbents were synthesized through a polycondensation reaction of a mixture of 4-amino-N'-hydroxy-1,2,5-oxadiazole-3-carboximidamide (hereinafter referred to as amidoxime) and SiO in an environment of organic solvents (acetic acid, dioxane) and highly porous SiO. To establish optimal conditions for forming the polymer sorption-active part and the synthesis as a whole, a series of composite adsorbents were synthesized with varying amidoxime/matrix ratios (35/65, 50/50, 65/35).
View Article and Find Full Text PDFSe Pu
February 2025
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
Solid-phase microextraction (SPME) is a fast and simple sample preparation technique that enables the enrichment of analytes, and it is used in combination with other detection techniques to provide accurate and sensitive analytical methods. SPME is widely used in environmental monitoring, food safety, life analysis, biomedicine, and other applications. The extractive coating is the core of the SPME technique, and the properties of the extractive coating greatly influence extraction selectivity and efficiency, as well as the enrichment effect.
View Article and Find Full Text PDFLangmuir
January 2025
Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan.
Understanding the interactions between lipid membranes and nucleotide drugs is crucial for nucleic acid therapy. Although several methods have been employed to evaluate nucleotide-lipid membrane interactions, these interactions can be complex; this complexity arises from how external factors, such as ionic strength or temperature, influence the lipid membrane's overall properties. In this study, we prepared a lipid membrane-immobilized monolithic silica (LMiMS) column for high-performance liquid chromatography (HPLC) analysis to understand interactions between the lipid membrane and nucleic acid.
View Article and Find Full Text PDFJ Hazard Mater
January 2025
Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China; College of the Environment and Ecology, Xiamen University, Xiamen 361005, China; Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen 361005, China. Electronic address:
Due to the distinct difference in chemical properties, analysis of organic pollutants and heavy metals generally employs different sample preparation and measurement techniques, resulting in low analytical efficiency and high cost. To this end, a strategy for the co-extraction and then simultaneous quantification of organic pollutants and heavy metals was proposed by the on-line hyphenation of magnetic field-assisted in-tube solid phase microextraction (MA/IT-SPME) and HPLC technique. Simultaneous analysis of triazoles and chromium species were adopted as paradigm to demonstrate the feasibility of the proposed strategy.
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