Un nouvela article intitulé "Room-temperature growth of covalent organic framework as stationary phase for open-tubular capillary electrochromatography" vient de paraître dans "Analyst".
Auteurs : Qiaoyan Li, Zhengtao Li, Yuanyuan Fu, Igor Clarot, Ariane Boudier, Zilin Chen
Analyst, Royal Society of Chemistry, 2021, https://doi.org/10.1039/D1AN01402A
Abstract :
Covalent organic frameworks (COFs) is a class of porous materials with high surface area, high porosity, good stability and tunable structure that have been neatly used in the separation area. In this work, we have proposed the in-situ synthesis of a novel COF composed of 4,4',4''-(1,3,5-Triazine-2,4,6-triyl)trianiline (Tz) and 1,4-dihydroxyterephthalaldehyde (Da) onto the capillary inner surface for electrochromatographic separation. Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA) and scanning electron microscopy (SEM) have been facilitated to characterize the prepared capillary columns. The COF (TzDa) modified OT-CEC column exhibited satisfactory separation selectivity towards neutral compounds (such as chlorobenzenes and alkylbenzenes), acidic and basic compounds (such as phenols and anilines), food additives (vanillin and its analogues) and small biomolecules (such as amino acids and polypeptides). Furthermore, the TzDa modified capillary was quite stable and repeatable. The relative standard deviations for retention times of the test analytes (alkylbenzenes) were as follow: for intra-day (n = 3) runs (≤ 1.74%), inter-day (n = 3) runs (≤ 2.25%) and column to columns (n = 3) (≤ 4.83%). This new type of COF-based stationary phase has tremendous potential in separation science.