New Directions in Porous Crystalline Materials (Faraday Discussions)

Abstract

Covalent organic framework composites have received great interest and regarded as new-generation porous materials in application of sample preparation. In this work, an agaric-like graphene oxide @ covalent organic framework ([email protected]) composite was first synthesized and used as an ideal adsorbent for enrichment of trace cytokinins (CKs) due to its large specific surface area, rich in micro-mesopore and organic functional groups. The contact areas between [email protected] composite and CKs were greatly increased due to the special agaric-like morphology, which would further improve the extraction efficiency. Hence, a rapid, simple and efficient [email protected] dispersive solid-phase extraction method for detecting four CKs (N6-(delta 2-isopentenyl)-adenine, kinetin, DL-dihydrozeatin and 6-benzylaminopurine) was successfully established. The proposed method had low limits of detection (0.1−2.0 pg mL−1), good reproducibility (RSDs≤3.9%, n=5) and high recoveries (84.4−107.7%). With this method, N6-(delta 2-isopentenyl)-adenine and 6-benzylaminopurine in plants were successfully detected and quantified. Results showed that the developed [email protected] composite possessed superior extraction performance and potential application in enrichment of trace targets from complex plant samples.