Showing papers in "Journal of Chromatography A in 2018"

TL;DR: Novel nonionic and hydrophobic deep eutectic solvents which were synthesized from natural compounds, i.e., thymol, ±camphor, decanoic and 10-undecylenic acids were determined, followed by their application as extractants in ultrasound-assisted dispersive liquid-liquid microextraction to isolate and enrich polycyclic aromatic hydrocarbons from aqueous samples characterized by a complex matrix.

TL;DR: This review shows the state-of-the art for the application of COFs and their composites in analytical separation science and the prospects ofCOFs for separation science.

TL;DR: The magnetic MOF-5 composites based MSPE followed by HPLC proved promising for convenient and efficient determination of heterocyclic pesticides in environmental water samples.

TL;DR: The adsorption mechanism of the TpAzo was investigated by using it to extract different types of organic compounds, including phthalates, phenylurea herbicides and carbamate insecticides and the results showed that the π-stacking and hydrophobic interactions between the TPAzo and the analytes played an important role for the adsorbent.

TL;DR: The history and contemporary theory of enantioseparations by using CE is summarized to better understanding the mechanisms of non-covalent (enantioselective) interactions in chemistry, biology, medicine and related disciplines.

TL;DR: A simple, fast, and sensitive method was developed for the enrichment and sensitive determination of seven estrogens, which showed good linearity, and successfully applied to the analysis of trace estrogens in urine sample of pregnant woman with good recoveries, demonstrating the promising potential of the Fe3O4@TbBd nanobeads as adsorbent in sample pretreatment.

TL;DR: A direct injection, multi residue analytical method separated in two chromatographic runs was developed utilizing scheduled analysis to simultaneously quantify 154 compounds, 84 precursors and 70 transformation products (TPs)/metabolites and can aid the assessment of water quality and water treatment processes.

TL;DR: N nano-sized covalent triazine-based framework grafted magnetic particles were synthesized by a facile Friedel-Crafts reaction between cyanuric chloride as node and biphenyl as linker to determine parabens in human urine, breast milk, personal care products, and shower wastewater.

TL;DR: It was determined that the MNPs have an excellent function as sorbent when purified even using less amount of sorbents and the magnetic properties allowed non-use of the centrifugation in cleanup step.

TL;DR: The results indicated that the proposed Fe3O4@SiO2@IL-MIPs possesses great identification and adsorption properties, and could be used as a good sorbent for selective extraction of CPs in environment waters.

TL;DR: In practice, 45 eggs and 30 milk samples were investigated by the proposed multiclass method, of which positive finding aflatoxin in milk and sterigmatocystin in eggs were found.

TL;DR: The aim of this study was to evaluate the suitability of SFC-MS for the analysis of a wide range of compounds including lipophilic and highly hydrophilic substances, for its potential application toward human metabolomics.

TL;DR: A dispersive solid phase extraction coupled with deep eutectic solvent-based air-assisted liquid-liquid microextraction has been developed and applied to the extraction and preconcentration of some tricyclic antidepressant drugs in the human urine and plasma samples prior to their determination by gas chromatography-mass spectrometry.

TL;DR: This method was successfully applied for the extraction and preconcentration of explosives in water and soil samples, followed their determination by high performance liquid chromatography with ultraviolet detection (HPLC-UV).

TL;DR: Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs, indicated the effectiveness of NG NFs coated fiber in further practical application.

TL;DR: The magnetic nanocomposite method was efficient for the residue analysis of organophosphorus pesticides in water with easy operation, high sensitivity, and good precision.

TL;DR: This method was highly reliable and sensitive for detecting neonicotinoid insecticides and IGRs in different floral sources of honey and will be applicable to matrixes with high sugar content.

TL;DR: A new procedure for the determination of organic acids in a complex aqueous matrix using ultrasound-assisted dispersive liquid-liquid microextraction followed by injection port derivatization and GC-MS analysis is presented.

TL;DR: It was tested to extract different types of compounds, proving that the DAAQ-TFP can serve as a superior adsorbent, and adsorption mechanism is mainly based on the π-π stacking and H bonding.

TL;DR: In this work, predictions of both RT and CCS values are performed with machine learning using artificial neural networks (ANNs) and can be useful for rapid suspect/non-targeted screening involving HRMS, and will support current workflows.

TL;DR: The results showed that the electrostatic interaction between the positively charged UiO-66 and anionic forms of phytohormones played an important role in the extraction of the phytOHormones.

TL;DR: The development and validation of a quantitation method for the analysis of multi-class, multi-residue veterinary drugs using lipid removal cleanup cartridges, enhanced matrix removal lipid (EMR-Lipid), for different meat matrices by liquid chromatography tandem mass spectrometry detection was presented.

TL;DR: The developed method offered some advantages, such as simple operation, rapidity and high concentration factor, therefore, it is suitable for monitoring the enantiomeric compositions of chiral pesticides in different environmental matrices.

TL;DR: Two methods were adopted to improve the performance of liquid chromatography-mass spectrometry, including offline two-dimensional LC to extend the peak capacities and predicted metabolites screening (PMS) to automatically screen the targets with expanded databases.

TL;DR: A comprehensive evaluation of 12 Protein A stationary phases for capture of biotherapeutics is described, and bivariate correlations are performed and considerations for process design and optimization are discussed.

TL;DR: The results demonstrated that BPS and BPF have become the most frequently used substitutes of BPA in sewage and sludge samples.

TL;DR: In this article, a core-shell structured magnetic metal-organic framework (MOF) composites with abundant boronic acid groups were designed and synthesized for selective glycopeptide enrichment based on BAAC.

TL;DR: Results demonstrate that counterions that are well hydrated serve to promote partitioning of charged solutes into the immobilized aqueous layer in HILIC, while poorly hydrated counterions have the opposite effect.

TL;DR: Results indicated that the as-prepared Fe3O4-Cys@MIL125-NH2 is a promising magnetic adsorbent for efficient enrichment of fluoroquinolones from tap water and environmental water samples.

TL;DR: T trace levels of d-amino acids in complex biological matrices were determined without disturbance by the intrinsic interfering compounds, and successfully applied to the analysis of the human clinical samples (plasma and urine).