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Updated: Jan 2, 2026

Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
Published on: September 29, 2023
Liquid-phase deposition of silica nanoparticles into a capillary for in-tube solid-phase microextraction coupled with
Ting Li1, Jin Xu, Jian-Hong Wu
1Department of Chemistry, Wuhan University, Wuhan, China.
Abstract:
A silica nanoparticle (NP)-deposited capillary fabricated by liquid-phase deposition (LPD) and modified with octadecyl groups was introduced for in-tube solid-phase microextraction coupled to high-performance liquid chromatography with UV detection (in-tube SPME-HPLC). The resultant capillary (60 cm x 50 microm I.D.) was demonstrated to be of higher extraction capacity by comparing with an octadecyl-grafted bare capillary and an octadecyl-grafted silica-coated capillary that was prepared by sol-gel chemistry. Two groups of compounds, endocrine disruptors and polycyclic aromatic hydrocarbons, were used as model analytes to further evaluate extraction capacity of the silica NP-deposited capillary, and its reproducibility and stability was also investigated. The extraction time profiles were monitored for all the chemicals, and their limits of detection were calculated to be in the range of 0.42-0.78 and 0.034-0.19 ng/mL with RSD values of peak area less than 4.6%.
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