Homogeneity study of a corn flour laboratory reference material candidate for inorganic analysis

卷:178

Pinto dos Santos, Ana Maria ; dos Santos, Liz Oliveira ; Brandao, Geovani Cardoso ; Leao, Danilo Junqueira ; Bellido Bernedo, Alfredo Victor ; Lopes, Ricardo Tadeu ; Lemos, Valfredo Azevedo

关键词: Corn flour;    Reference material candidate;    Homogeneity study;    Analysis of variance;    Principal component analysis;   

DOI  :  10.1016/j.foodchem.2015.01.024

学科分类：食品科学和技术

【 摘 要 】

In this work, a homogeneity study of a corn flour reference material candidate for inorganic analysis is presented. Seven kilograms of corn flour were used to prepare the material, which was distributed among 100 bottles. The elements Ca, K, Mg, P, Zn, Cu, Fe, Mn and Mo were quantified by inductively coupled plasma optical emission spectrometry (ICP OES) after acid digestion procedure. The method accuracy was confirmed by analyzing the rice flour certified reference material, NIST 1568a. All results were evaluated by analysis of variance (ANOVA) and principal component analysis (PCA). In the study, a sample mass of 400 mg was established as the minimum mass required for analysis, according to the PCA. The between-bottle test was performed by analyzing 9 bottles of the material. Subsamples of a single bottle were analyzed for the within-bottle test. No significant differences were observed for the results obtained through the application of both statistical methods. This fact demonstrates that the material is homogeneous for use as a laboratory reference material. (C) 2015 Elsevier Ltd. All rights reserved.