Rovasi Adolfo Franciele, Balczareki Lucena Nicoly, Trombe Do Valle Lucas, Machado De Carvalho Leandro, Noremberg Kunz Simone
Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
Departamento de Farmácia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
Food Chem. 2024 Aug 1;448:139139. doi: 10.1016/j.foodchem.2024.139139. Epub 2024 Mar 30.
This paper describes a new experimental configuration of extraction induced by emulsion breaking method to extract and determine Ni and Co in chocolate bars by graphite furnace atomic absorption spectrometry. At optimized conditions, the sample (0.08 g) was mixed with 4 mL of extractant solution (4% m/v Triton X-100 and 10% v/v HNO) in a plastic syringe to form a solid-oil-water emulsion. Then, emulsion breaking was assisted by membrane filtration. The total extraction procedure took approximately 1 min, in opposition to 25 (centrifugation) and 50 min (heating). Extraction yields ranged from 94.8 to 114.3% for Co and from 85.9 to 108.4% for Ni. The limits of detection and quantification were, respectively, 24.73 and 82.45 μg Kg for Co and 49.05 and 163.5 μg Kg for Ni. Recoveries ranged from 92.1 (Ni) to 105.4% (Co).
本文描述了一种通过破乳法诱导萃取的新实验配置，用于通过石墨炉原子吸收光谱法萃取和测定巧克力棒中的镍和钴。在优化条件下，将样品（0.08 g）与4 mL萃取剂溶液（4% m/v Triton X-100和10% v/v HNO）在塑料注射器中混合，形成固-油-水乳液。然后，通过膜过滤辅助破乳。整个萃取过程大约需要1分钟，相比之下，离心法需要25分钟，加热法需要50分钟。钴的萃取率在94.8%至114.3%之间，镍的萃取率在85.9%至108.4%之间。钴的检测限和定量限分别为24.73 μg Kg和82.45 μg Kg，镍的检测限和定量限分别为49.05 μg Kg和163.5 μg Kg。回收率在92.1%（镍）至105.4%（钴）之间。
