Synthesis of MIL-101-alginate biocomposite as a novel self-supportive thin film for microextraction of phosalone in
Samira Aghaei Koltappeh1, Zahra Ayazi2
1Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, P.O. Box 53714-161, Tabriz, Iran.
Abstract:
A novel thin film microextraction (TFME) method was developed for phosalone determination in fruit and vegetable samples using gas chromatography-flame ionization detection (GC-FID). MIL-101 metal-organic framework (MOF) was synthesized via solvothermal condensation and incorporated into alginate (Alg) through solvent blending, forming a monolithic self-supportive thin film. The MIL-101/Alg biocomposite was characterized using XRD, FT-IR, and SEM. The impact of MIL-101 doping on extraction efficiency was assessed, showing significant enhancement. A central composite design (CCD) optimized extraction and desorption conditions. The method exhibited a detection limit of 1.6 ng mL-1 and a quantification limit of 5.5 ng mL-1, with a linear range of 5.5-1000 ng mL-1 (r2 = 0.9909). Intra-day, inter-day, and inter-sorbent precisions (n = 6) were 3.6, 4.07, and 9.4 %, respectively. Validation in spiked real samples (apple, celery, cucumber, and tomato) showed relative recoveries above 93.2 %, confirming method accuracy and applicability.
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