One-pot pH adjustment, derivatization, and extraction using a multi-functional magnetic adsorbent for analysis of furfural compounds in foods

> 0.992), low limits of detection (8.0-13.7 ng/mL), and high recoveries (87.7-99.4%) with relative standard deviations ≤12.1%. It was successfully applied to diverse samples, including teas, juices, coffees, and herbal liquids. Optimization confirmed a 50% ethanol content, a 3 mL sample volume, and 30 min incubation at 30 °C. This strategy integrates derivatization, pH adjustment, and extraction into a self-activated platform suitable for automated operation. It simplifies workflows, improves reproducibility, and shows strong potential for high-throughput food safety and quality monitoring.