Preparation and characterization of a new reference material for the inorganic analysis of corn flour

详细信息    查看全文

• 作者：Ana Maria P. dos Santos ; Liz O. dos Santos…
• 关键词：Reference material ; Corn flour ; HCA ; Confidence ellipse
• 刊名：Accreditation and Quality Assurance
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：22
• 期：1
• 页码：37-43
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Analytical Chemistry; Food Science; Biochemistry, general; Commercial Law; Ecotoxicology; Marketing;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0517
• 卷排序：22

文摘

Corn is one of the most consumed cereals in world and the second most cultivated in Brazil. Cereal flour has a flavor well accepted by the Brazilian population. This work describes the preparation and characterization of a new corn flour reference material which can be used as a quality assurance tool to demonstrate the reliability of the analytical results obtained from inorganic analysis of cereals and their derivatives. The studied elements were Ca, K, Mg, P, Cu, Fe, Mn and Zn. Homogeneity and stability tests, material characterization and attribution of uncertainty value were performed in this work by following recommendations of ISO Guides 30–35. The material was shown to be homogeneous and stable for 15 months at temperatures of −10 °C, +25 °C and +45 °C, with small uncertainty. Alternatively, the data were analyzed by hierarchical clustering technique and the stability was confirmed. The confidence ellipse technique enabled a simple and fast evaluation of data supplied by collaborating laboratories allowing the exclusion of outlying values and indicating possible causes of the deviations.