scholarly journals Polysaccharide-Based Chiral Stationary Phases on Gold Nanoparticles Modified Silica Beads for Liquid-Phase Separation of Enantiomers

2020 ◽  
Vol 58 (8) ◽  
pp. 731-736
Author(s):  
Yuanyuan Li ◽  
Zhuxian Gao ◽  
Tong Chen ◽  
Manman Wei ◽  
Yulong Ma ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
High Performance ◽  
Chiral Stationary Phase ◽  
Au Nanoparticles ◽  
Stationary Phases ◽  
Au Nps ◽  
Silica Surfaces ◽  
Silica Bead ◽  
Phase Liquid ◽  
Chloride Hydrate

Abstract Au nanoparticles (AuNPs) (10−15 nm in size) were prepared and deposited on the surfaces of silica particles functionalized using 3-aminopropyltriethoxysilane as the seeds under mild conditions. Then, Au seeds grew further and formed nanosheets by the method of gold chloride hydrate reduction. 3, 5-dimethylphenyl isocyanate derivative of cellulose as chiral selector was coated on the surfaces of SiO2/Au. The obtained spheres possessed a sandwich structure in which silica bead, the packed Au NPs monolayer and cellulose derivative were the core, the interlayer and the shell, respectively. The resultant packing material was evaluated by high-performance liquid chromatography (HPLC) as chiral stationary phase (CSP). The separations of nine pairs of enantiomers were achieved in the normal-phase liquid chromatography mode. The results showed that the new CSP has sufficient interaction with the analytes due to the existence of AuNPs on silica surfaces compared with coated cellulose-silica column.

Complete Methylation of Silica Surfaces:  Next Generation of Reversed-Phase Liquid Chromatography Stationary Phases

Langmuir ◽  
2003 ◽  
Vol 19 (20) ◽  
pp. 8608-8610 ◽  
Author(s):  
J. David Sunseri ◽  
Thomas E. Gedris ◽  
Albert E. Stiegman ◽  
John G. Dorsey
Keyword(s):  
Liquid Chromatography ◽  
Stationary Phases ◽  
Reversed Phase ◽  
Next Generation ◽  
Reversed Phase Liquid Chromatography ◽  
Silica Surfaces ◽  
Phase Liquid

Chiral separation and a molecular modeling study of eight azole antifungals on the cellulose tris(3,5-dichlorophenylcarbamate) chiral stationary phase

2018 ◽  
Vol 42 (16) ◽  
pp. 13421-13429 ◽  
Author(s):  
Bolin Zhu ◽  
Fan Zhao ◽  
Jia Yu ◽  
Zhaokun Wang ◽  
Yongbo Song ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Molecular Modeling ◽  
Stationary Phase ◽  
Chiral Separation ◽  
Chiral Stationary Phase ◽  
Stationary Phases ◽  
Chiral Stationary Phases ◽  
Normal Phase ◽  
Azole Antifungals ◽  
Phase Liquid

Four immobilized polysaccharide-based chiral stationary phases have been examined for their enantioselectivity on azole analytes using normal phase liquid chromatography.

Determination of methionine enantiomers by HPLC on the cyclofructan chiral stationary phase

2015 ◽  
Vol 7 (11) ◽  
pp. 4577-4582 ◽  
Author(s):  
Katarína Hroboňová ◽  
Jakub Moravčík ◽  
Jozef Lehotay ◽  
Daniel W. Armstrong
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Stationary Phase ◽  
High Performance ◽  
Chiral Stationary Phase ◽  
Stationary Phases ◽  
Chiral Stationary Phases ◽  
Enantiomeric Separation

The enantiomeric separation of methionine by high performance liquid chromatography on various cyclofructan type chiral stationary phases in the polar-organic separation mode was studied.

scholarly journals Development and Application of a Novel Pluri-Residue Method to Determine Polar Pesticides in Fruits and Vegetables through Liquid Chromatography High Resolution Mass Spectrometry

Foods ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 553
Author(s):  
Lorena Manzano-Sánchez ◽  
José Antonio Martínez-Martínez ◽  
Irene Domínguez ◽  
José Luis Martínez Vidal ◽  
Antonia Garrido Frenich ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
High Resolution ◽  
High Performance ◽  
Fruits And Vegetables ◽  
High Resolution Mass Spectrometry ◽  
Stationary Phases ◽  
Mean Values ◽  
Polar Pesticides ◽  
Relative Standard ◽  
The Matrix

Nowadays, highly polar pesticides are not included in multiresidue methods due to their physico-chemical characteristics and therefore, specific analytical methodologies are required for their analysis. Laboratories are still looking for a pluri-residue method that encompasses the largest number of polar pesticides. The aim of this work was the simultaneous determination of ethephon, 2-hydroxyethylphosphonic acid (HEPA), fosetyl aluminum, glyphosate, aminomethylphosphonic acid (AMPA), N-acetyl-glyphosate and N-acetyl-AMPA in tomatoes, oranges, aubergines and grapes. For that purpose, an ultra high performance liquid chromatography (UHPLC) coupled to a high resolution single mass spectrometer Orbitrap-MS were used. Different stationary phases were evaluated for chromatographic separation, and among them, the stationary phase Torus DEA provided the best separation of the selected compounds. The QuPPe method was used for the extraction of the analytes, but slight modifications were needed depending on the matrix. The developed method was validated, observing matrix effect in all matrices. Intra- and inter-day precision were estimated, and relative standard deviation were lower than 19%. Recoveries were satisfactory, and mean values ranged from 70% to 110%. Limits of quantification were between 25 and 100 µg kg−1. Finally, the analytical method was applied to different fruits and vegetables (oranges, tomatoes, aubergines and grapes).

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