期刊
FOOD CHEMISTRY
卷 224, 期 -, 页码 335-341出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.12.096
关键词
Infrared radiation; Flaxseed; Sample preparation; FAAS; Trace elements
资金
- Fundacao Cearense de Apoio a Pesquisa (FUNCAP)
- Coordenadoria de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
A new approach to the analysis of Cu, Fe, Mn and Zn in flaxseed was developed based on infrared-assisted acid digestion. Quantitation by flame atomic absorption spectrometry yields results in agreement with those arising from aggressive total decomposition using conventional microwave-assisted (MW) digestions. A full factorial design in two levels was applied to evaluate the impact of significant variables for all elements to determine optimal experimental conditions. A desirability function revealed these to be: 2.0 g sample mass, 8 mL of HNO3 and 8 min of heating time in the IR system. Precision better than 10% (RSD) was obtained, superior to that of a combined IR-MW approach. Sample preparation based on IR-assisted digestion provides a rapid and inexpensive alternative to other conventional techniques for the analysis of complex samples and is able to accommodate relatively large masses of sample, alleviating potential homogeneity issues as well as enhancing detection power. (C) 2016 Elsevier Ltd. All rights reserved.
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