Magnetic porous carbon derived from NH₂‐MIL‐101(Fe) as an adsorbent for the magnetic solid‐phase extraction of anthraquinones

Abstract

A magnetic porous carbon NH 2 -MIL-101-C was synthesized through a one-step carbonization process using NH 2 -MIL-101(Fe) as the precursor. The morphology, structure, magnetic behavior, and porosity of the as-prepared NH 2 -MIL-101-C were characterized. The results show that NH 2 -MIL-101-C has a high Brunauer-Emmett-Teller surface area (213.7 m 2 /g), a large pore volume (0.2 m 3 /g), and a good magnetic property (23.4 emu/g). The NH 2 -MIL-101-C was first used as a magnetic solid-phase extraction adsorbent for the extraction of five anthraquinones from rhubarb. The main parameters that will affect the extraction efficiency were investigated. Under the optimized conditions, good linearity for the five anthraquinones was obtained with the R 2 higher than 0.9910. The limits of detection and limits of quantitation for the analytes are 0.018−0.042 and 0.050−0.140 μg/mL, respectively.

Applications of magnetic solid‐phase extraction in the sample preparation of natural product analysis (2020–2023)

“…For example, Zhou et al. [64] synthesized a magnetic octahedral metal‐organic framework (Fe 3 O 4 @NH 2 ‐MIL‐101(Fe)) to enrich and detect three AQs, including emodin, physcion, and aloe‐emodin, in rhubarb with a reasonable adsorption capacity (22.5–77.7 mg/g). The entire extraction process takes only 1.5 mg of adsorbent and 1.0 mL of real sample.…”

“…Therefore, it is fairly reliable to selectively extract AQs from plants through hydrophobicity, hydrogen bonding, and electrostatic attractions between adsorbents and AQs. For example, Zhou et al [64] synthesized a magnetic octahedral metal-organic framework (Fe 3 O 4 @NH 2 -MIL-101(Fe)) to enrich and detect three AQs, including emodin, physcion, and aloe-emodin, in rhubarb with a reasonable adsorption capacity (22.5-77.7 mg/g). The entire extraction process takes only 1.5 mg of adsorbent and 1.0 mL of real sample.…”