Abstract
In the present study, a magnetic nano gel as the sorbent which is the combination of octatonic acid: cumarin as eutectic solvent and Fe(3)O(4)@SiO(2) was introduced as the sorbent in ultrasound-assisted dispersive µ-solid phase extraction process coupled with high performance liquid chromatography with photo diode array detector for simultaneous separation and determination of tetracyclines residues in food samples. FT-IR, SEM, VSM were used for the characterization of the synthetized magnetic nano gel. Under obtained optimum conditions, the obtained linear ranges were 1.5-500 (µg L(-1)), 2.5-750 (µg L(-1)), 2-750 (µg L(-1)), and 2.5-500 (µg L(-1)) for tetracycline, oxytetracycline, chlortetracycline, and doxycycline, respectively. Moreover, the below level of quantification (BLQ) (based on S/N = 3) of 0.47 µg L(-1), 0.11 µg L(-1), 0.85 µg L(-1), 0.66 µg L(-1), 0.81 µg L(-1) and the limit of quantification (based on S/N = 10) of 1.61, 2.74, 2.23 (µg L(-1)), and 2.66 were achieved for tetracycline, oxytetracycline, chlortetracycline, and doxycycline, respectively. The intra-day and inter-day precision (%) of the procedure were less than 3.2 and 3.8, respectively. The recoveries over 95% confirmed high sufficiency of the proposed method for application in complex matrices such as honey, milk, and egg. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s13197-023-05798-w.