Ultrasound-assisted extraction for the determination of Cu, Mn, Ca, and Mg in alternative oilseed crops using flame atomic absorption spectrometry

卷:196

Dias Peronico, Vanessa Cruz ; Raposo, Jorge Luiz, Jr.

Fed Univ Grande Dourados

关键词: Sample preparation;    Plant nutrition;    Green chemistry;    FAAS;   

DOI  :  10.1016/j.foodchem.2015.10.080

学科分类：食品科学和技术

【 摘 要 】

An ultrasound-assisted extraction procedure was evaluated for the multi-element determination of Cu, Mn, Ca, and Mg in alternative oilseed crops using flame atomic absorption spectrometry. The best results were obtained when 0.3 g of samples were used to extract the mineral content using 10 mL of a 1.40 mol L-1 HNO3 solution for 10 min at 25 degrees C. The accuracy and precision of the analysis were evaluated using two oilseed reference materials, and the results were in agreement with reference values at 95% confidence level (paired t-test). The method was used to analyze five oilseed samples and the results were in agreement with those obtained using a closed-vessel microwave-assisted acid digestion system for sample preparation. The relative standard deviations were 0.52-6.13% for all of the standard and sample measurements, and the limits of detection were 666.7, 416.7, 333.4 mu g g(-1), and 3.5 mg g(-1) for Cu, Mn, Ca, and Mg, respectively. (C) 2015 Elsevier Ltd. All rights reserved.