da Rosa Francisco Cunha, Nunes Matheus Augusto Gonçalves, Duarte Fábio Andrei, Flores Érico Marlon de Moraes, Hanzel Flávia Brito, Vaz Agnes Souza, Pozebon Dirce, Dressler Valderi Luiz
Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, 95770-000 Feliz, RS, Brazil.
Food Chem X. 2019 May 7;2:100028. doi: 10.1016/j.fochx.2019.100028. eCollection 2019 Jun 30.
The consumption of rice milk has increased, mainly by individuals intolerant to lactose or allergic to cow milk. However, rice milk contains As. In this sense, the concentration of As in rice milk should be controlled. In the present study it is proposed a methodology for determination of As(III), dimethylarsenic (DMA), monomethylarsenic (MMA) and As(V) species in rice milk using LC-ICP-MS. The main features of the methodology are fast analysis, easy and simple sample preparation, where the sample is 3-fold diluted in the mobile phase and then filtered. The four arsenic species investigated were detected in the analysed samples, being As(V) the main species. The limit of quantification of the method ranges from 0.25 to 0.43 μg L As. The analyte recovery ranged from 81 to 116% for samples spiked to 1.00 μg L or 5.00 μg L As and the relative standard deviation was better than 5%.
米浆的消费量有所增加，主要是乳糖不耐受或对牛奶过敏的人群。然而，米浆中含有砷。从这个意义上说，米浆中的砷浓度应该受到控制。在本研究中，提出了一种使用液相色谱 - 电感耦合等离子体质谱法（LC-ICP-MS）测定米浆中三价砷（As(III)）、二甲基砷（DMA）、一甲基砷（MMA）和五价砷（As(V)）形态的方法。该方法的主要特点是分析速度快、样品制备简单，只需将样品在流动相中3倍稀释，然后过滤。在所分析的样品中检测到了所研究的四种砷形态，其中五价砷是主要形态。该方法的定量限为0.25至0.43μg L As。对于添加了1.00μg L或5.00μg L As的样品，分析物回收率在81%至116%之间，相对标准偏差优于5%。
