Use of Fe3O4@MPTMS-Dithizone Magnetic Nanoparticles as Solid Phase Sorbent for Sensitive Analysis of Sibutramine Molecules in Herbal Slimming Products

Abstract

Background: A new enrichment and sensitive determination method, which includes HPLC-DAD analysis after Magnetic Solid Phase Extraction (MSPE), has been developed for trace analysis of Sibutramine molecules in herbal slimming products. Sibutramine is one of the most adulterated drug molecules in herbal products. Method: In the proposed method, Sibutramine molecules were pre-concentrated by using Fe3O4@MPTMS-Dithizone magnetic sorbent synthesized in our laboratory. Desorption of Sibutramine molecules from the sorbent phase was carried out by using acetonitrile: methanol (1:1) solvent in the presence of pH 8.0 buffer before chromatographic determinations. Results: Analytical parameters of the method, such as linear range, enrichment factor, and determination limit, were determined after optimizing experimental variables such as interaction time, desorption solvent, pH, etc. The sibutramine molecule was analyzed by isocratic elution of acetonitrile and KH2PO4 (pH 3.0, 0.05 M) (40:60) with a DAD detector at 223 nm wavelength. Limit of detection (LOD) value was calculated as 1.43 ng mL-1. Conclusion: Relative standard deviations (RSD) were below 3.20 % for determinations of model solutions, including 200 ng mL-1 of Sibutramine. Finally, the developed method has been applied to herbal slimming tea samples with quantitative recovery experiments.

Magnetic materials as adsorbents for the pre‐concentration and separation of active ingredients from herbal medicine

“…Furthermore, the relevant adsorption and resolution conditions have been optimized, as demonstrated in Figure 4. Demir et al [87] have innovated a novel approach for the enrichment and sensitive determination of sibutramine molecules in a traditional Chinese medicine weight loss product, employing an MSPE-HPLC-DAD method. The researchers utilized a self-synthesized Fe 3 O 4 @MPTMSdithizone magnetic adsorbent for the pre-enrichment of sibutramine.…”