Borges Fabrício Alves, Costa Lucimara Mendonça, Tarley César Ricardo Teixeira, de Fátima Lima Martins Giovana, Figueiredo Eduardo Costa
Laboratory of Toxicant and Drug Analyses, Faculty of Pharmaceutical Sciences, Federal University of Alfenas, 37130-001 Alfenas, MG, Brazil; Institute of Chemistry, Federal University of Alfenas, 37130-001 Alfenas, MG, Brazil.
Department of Chemistry, State University of Londrina, Rodovia Celso Garcia Cid. 445, Km 380, Londrina 86057-970, PR, Brazil.
Food Chem. 2023 Jul 1;413:135676. doi: 10.1016/j.foodchem.2023.135676. Epub 2023 Feb 11.
The direct magnetic sorbent sampling flame atomic absorption spectrometry (DMSS-FAAS), recently proposed by our research group, was applied to determine the lead in soy-based juice, whole grape juice, reconstituted grape juice, and orange nectar samples. A dispersive solid phase extraction (d-SPE) of lead was carried out using a magnetic orange peel powder, developed and optimized by Gupta et al (2012), that was inserted into flame by FAAS with a magnetic probe. The limits of quantification (<4.6 μg L) were smaller than maximum residue limits established in Brazil. Good precisions and accuracies were obtained. DMSS-FAAS presented a sensitivity at least 14 times greater than the d-SPE followed by conventional FAAS analysis, wherein the analytes were extracted and desorbed, and the eluate was introduced in FAAS via nebulization system. Lead was easily quantified in juice samples at very low concentrations, with satisfactory figures of merit, and without the need of a mineralization step.
我们研究小组最近提出的直接磁吸附剂采样火焰原子吸收光谱法（DMSS-FAAS），被用于测定大豆汁、全葡萄汁、复原葡萄汁和橙汁样品中的铅。使用由Gupta等人（2012年）开发并优化的磁性橙皮粉对铅进行分散固相萃取（d-SPE），该磁性橙皮粉通过磁探针插入火焰原子吸收光谱仪的火焰中。定量限（<4.6 μg/L）低于巴西规定的最大残留限量。获得了良好的精密度和准确度。与先进行分析物萃取和解吸，然后通过雾化系统将洗脱液引入火焰原子吸收光谱仪的d-SPE随后进行常规火焰原子吸收光谱分析相比，DMSS-FAAS的灵敏度至少高14倍。铅能够在极低浓度的果汁样品中轻松定量，具有令人满意的品质因数，并且无需进行矿化步骤。
