Microwave induced plasma optical emission spectrometry for multielement determination in instant soups

Publication date: Available online 12 November 2019Source: Journal of Food Composition and AnalysisAuthor(s): Larissa São Bernardo Carvalho, Caroline Santos da Silva, Joaquim Araújo Nóbrega, Elane Santos Boa Morte, Daniele Cristina Muniz Batista Santos, Maria Graças Andrade KornAbstractThis paper presents the use of microwave induced plasma optical emission spectrometry (MIP OES) for food analysis. A method for determination of Cu, K, Mg, Mn, P, and Zn in instant soups by MIP OES with N2 plasma was developed. Sample preparation procedure consisted of microwave-assisted digestion with dilute nitric acid solution. Accuracy was evaluated based on the analysis of three certified reference materials: NIST 1515 (apple leaves), NIST 1568b (rice flour) and NIST 3234 (soy flour). Recoveries ranged from 83.3 to 107.5 % for target elements in these materials. Addition and recovery experiments were performed and recoveries ranged from 86.0 to 106.0 %. All determinations were performed using external calibration. Limits of detection for Cu, K, Mg, Mn, P, and Zn were 0.09, 4.90, 1.00, 0.04, 5.40 and 0.88 mg kg-1, respectively. Concentrations ranges of Cu, K, Mg, Mn, P and Zn in various types of instant soups samples were found between 1.31 - 13.8, 1,135 - 17,824, 172 - 567, 1.72 - 12.1, 608 - 1,826 and 2.90 - 12.1 mg kg-1, respectively. The use of N2 microwave-induced plasma is demonstrated as a low cost alternative for routine analysis.

Source: Journal of Food Composition and Analysis - November 13, 2019 Category: Food Science Source Type: research