ArticleSe pu = Chinese journal of chromatography2025
[Liquid-liquid interface synthesized covalent organic framework films for efficient extraction of okadaic acid from seawater].
Article in Se pu = Chinese journal of chromatography, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Okadaic acid （OA） is a fatty acid polyether biotoxin that poses risks to human health and the ecological environment. Determining the concentrations of OA in seawater not only allows for early warnings of potential toxin accumulation in marine organisms， but also helps clarify the actual impacts of OA on marine ecosystems. However， OA exists in seawater at extremely low concentrations， and the matrix has a high salt content. Thus， adequate sample pretreatment is necessary prior to high performance liquid chromatography-tandem mass spectrometry （HPLC-MS/MS） analysis. Film-based solid-phase extraction （F-SPE） has attracted considerable attention in sample pretreatment. Unlike conventional solid-phase extraction （SPE）， which relies on large quantities of adsorbent particles， F-SPE uses a thin film， thereby addressing common issues in SPE applications such as high column pressure， column clogging， and adsorbent leakage. Currently， most such films are prepared by modifying polymer film skeletons with a certain amount of adsorbent particles. Nonetheless， these adsorbent particles have inherent limitations， including insufficient adsorption capacity or irreversible adsorption， leading to poor extraction performance for specific targets. Therefore， developing new types of films with high extraction efficiency is highly significant， as it can facilitate the wider application and popularization of this technology. Covalent organic frameworks （COFs） are porous crystalline materials with adjustable pore size， high specific surface area， and excellent stability. COF films can not only inherit the high permeability of films， but also possess strong COF adsorption capacity. In this work， a COF film （TPB-BTCA） was synthesized through the liquid-liquid interface synthesis method under mild reaction conditions， and characterized in detail. The Fourier-transform infrared （FT-IR） spectrum， X-ray diffraction （XRD） pattern， and X-ray photoelectron （XPS） spectrum verify the successful preparation of the TPB-BTCA film using a Schiff base reaction. The scanning electron microscopy （SEM） images and water contact angle testing show the prepared TPB-BTCA film is a hydrophilic heterogeneous film with specific morphologies， which is beneficial to a more thorough and rapid contact between the film and the sample solution. The nitrogen adsorption-desorption experiment demonstrates the TPB-BTCA film has a high surface area （1 261.6 m
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