| UV absorbers and light stabilizers can delay the oxidation reaction of the polymer.However,recent research have confirmed that these additives have relatively low molecular weights and migration mechanisms into foods,therefore it can be as a source of contamination through the migration of substances from the packaging material into food during production or storage.Hence,it is quite crucial to develop asimple and effective methods for the determination of UV absorbers and light stabilizers.In the study,Fe3O4 NPs were surface-modified to separate and enrich ultraviolet absorbers and light stabilizers from food packaging bags,coupled with high-performance liquid chromatography(HPLC)to establish a simple and efficient method for ultraviolet absorbers and light stabilizers analysis.The main research contents of this paper are as follows:(1)n-octylic acid modified Fe3O4 and its application in the analysis of 2,4-DTBP,UV-326,UV-328,UV-0,UV-9,UV-531 in businesspreservativefilmN-octylic acid coated Fe3O4 nanoparticles(Fe3O4@ n-octylic acid NPs)were selected for highly efficient adsorbent in magnetic solid phase extraction for adsorption of six ultraviolet absorbers and light stabilizers:2,4-DTBP,UV-326,UV-328,UV-0,UV-9,UV-531 in businesspreservativefilm.Physical characterizations of prepared Fe3O4@ n-octylic acid were carried out by transmission electron microscopy(TEM)and X-ray diffraction(XRD),individually.The analytical method showed good linearity,presenting regression coefficients(R2)≥0.9999.The limits of detection were 0.42,0.14,0.04,0.13,0.14,and 0.05μg mL-1 respectively.The mean recoveries were in the range from 84.9%to 103.4%at 2.5,5,and 10 μg mL-1 spiked levels,and the relative standard deviations(RSDs)were in the range from 1.53%to 4.5%.An analytical method for the quantitative determination of six ultraviolet absorbers and light stabilizers in food packaging bags using solid phase extraction(MSPE)coupled with high-performance liquid chromatography(HPLC)has been developed.(2)Au modified Fe3O4 and its application in the analysis of UV-326,UV-328,UV-531 in yogurt milk productsAu coated Fe3O4 NPs(Fe3O4@Au)were prepared using modified chemical co-precipitation in aqueous solution.The particle size and crystalline structures of MNPs were characterized by TEM and XRD,respectively.The coated Fe3O4 NPs were applied for the adsorption of UV-531,UV-326 and UV-328 from in yogurt milk products.Main parameters affecting the adsorption of UV absorbers and light stabilizers were evaluated and optimized including the amount of adsorbent,extraction time,pH of the sample solution and desorption conditions.The proposed method showed good linearity in the range from 0.75 to 100 μg mL-1 with good presenting regression coefficients(R2)≥0.9999.Low limits of detection(LODs)were achieved 0.05,0.14 and 0.04μg mL-1 for UV-531,UV-326 and UV-328,respectively.The mean recoveries were in the range from 88.60%to 96.86%at 2.5,5,and 10 μg mL-1 spiked levels,and the relative standard deviations(RSDs)were in the range from 0.58%to 4.97%.(3)CTAB modified Fe3O4 and its application in the analysis of 2,4-DTBP,UV-326,UV-328 in Cookies packingMagnetic Fe3O4 nanoparticles synthesized via chemical co-precipitation,and corresponding thiolated magnetite nanoparticles are also obtained via surface cetyltrimethylammonium bromide(CTAB)modificati(Fe3O4@CTAB).The prepared nanoparticles were used as sorbent in magnetic solid phase extraction procedure for the determination of 2,4-DTBP,UV-326 and UV-328 in cookies packing.Combined with high-performance liquid chromatography.The mean recoveries were in the range from 86.43 to 99.39%at low,medium and high spiked levels,and the relative standard deviations(RSDs)were in the range of 0.57%to 3.46%. |
PDF Full Text Request