Search

• NH 2 -HMSN with hollow and mesoporous structure was used to extract FFAs. • Adsorption capacity of NH 2 -HMSN towards FFAs was superior to NH 2 -MSN and NH 2 -SM. • NH 2 -HMSN could be successfully prepared under normal pressure and temperature. In our study, ammoniated hollow mesoporous silica nanoparticles (NH 2 -HMSN) with uniform diameter and stable structure were successively prepared via SiO 2 core hard template method. Fourier transformed infrared spectroscopy revealed that amino group was effectively modified. Adsorption experiments showed that adsorption capacity of NH 2 -HMSN towards free fatty acids (FFAs) was superior to aminated mesopores or silica microspheres. Following through optimization of extraction conditions, FFAs from edible oil samples were successfully gathered by NH 2 -HMSN and showed favorable linearities (0.2–90 μg g−1), remarkably low limit of detections (0.03–0.15 nmol g−1), acceptable recoveries (85.08–96.82 %) and relatively accurate precisions (1.64–4.99 %). In comparison to existing adsorbent, NH 2 -HMSN could be successfully prepared via the chemical reaction of common raw materials under normal pressure and temperature. Furthermore, NH 2 -HMSN with hollow and mesoporous structure was more effective than the current adsorbents aimed at FFAs analysis in aspect of surface area and adsorption capacity. [ABSTRACT FROM AUTHOR]

• Amino-modified mesoporous silica was applied in MSPD for first time to extract FFAs. • Higher absorption capacity was achieved by introducing ordered mesoporous structure. • The application of MSPD simplified FFAs analysis in solid and semi-solid samples. Amino-modified mesoporous silica was prepared by modifying mesoporous silica with 3-aminopropyltriethoxysilane and used as adsorbents in matrix solid-phase dispersion (MSPD) to analyze free fatty acids (FFAs) in krill meals for the first time. The adsorption–desorption experiments and Fourier-transform infrared spectroscopy showed amino-modified mesoporous silica with ordered mesoporous structure was successfully synthesized. The adsorption experiments including static and dynamic adsorption showed that absorption capacity of amino-modified mesoporous silica towards FFAs was better than that of aminated silicon microspheres at all concentrations. Under optimal extraction conditions, outstanding linearity (0.1–12000 nmol g−1), low LODs (0.05–1.25 nmol g−1), satisfactory recoveries (82.17–96.43%) and precisions (0.19–5.26%) were obtained. Moreover, the application of MSPD for FFAs analysis avoided complicated lipid extraction procedures and accomplished the homogenization, crushing, extraction and cleaning of the samples in one step. Consequently, this approach provides an alternative choice to the existing approach for analyzing FFAs in solid and semi-solid samples. [ABSTRACT FROM AUTHOR]