Work

Covalent organic framework coating with abundant hydrogen bonding sites for efficient enrichment and sensitive detection of oxygenated polycyclic aromatic hydrocarbons in tea

Year: 2025

Type: article

Abstract: Monitoring trace oxygenated polycyclic aromatic hydrocarbons (O-PAHs) in tea infusions is crucial, as long-term consumption of O-PAHs-contaminated tea can harm health. In this work, covalent organic framework (COF) TpBD-(OH) 2 coating was fabricated for solid-phase microextraction (SPME) of O-PAHs. The coating contains abundant benzene rings and hydrogen bonding sites (oxygen and nitrogen groups). Density functional theory calculations, electrostatic potential distribution and X-ray photoelectron spectroscopy analysis indicated the COF efficiently adsorbs O-PAHs via van der Waals force , hydrogen bonding, electrostatic force , size matching, and π-π interaction. Under the best SPME conditions, a method for detecting O-PAHs in tea infusions was developed using gas chromatography-tandem mass spectrometry (GC–MS/MS). The method possessed low limit of detection (0.5–1.0 ng L −1 ), wide linearity (2.0–1000.0 ng L −1 ) and satisfactory recoveries (82.5 %–117.5 %). Furthermore, the method was used to study the impacts of different roasting methods on O-PAHs contamination, and results showed carbon roasting posed a higher risk.

Source: Food Chemistry

DOI: 10.1016/j.foodchem.2025.144181

Authors: Qidong Yu, Yiding Li, Wenmin Zhang, Xueting Cui, Shiye Xie, Lan Zhang

Institutions: Fuzhou University, Minjiang Teachers College

Language: English

Topic: Analytical chemistry methods development

Subfield: Analytical Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,930

Funders: National Natural Science Foundation of China, Natural Science Foundation of Fujian Province