Green microwave-assisted wet digestion method of carbohydrate-rich foods with hydrogen peroxide using single reaction chamber and further elemental determination using ICP-OES and ICP-MS
| Autor: | Juliana P. Souza, Aline L. H. Muller, Michele S.P. Enders, Cristiano C. Muller, Edson I. Muller, Angelica C. Frohlich, Morgana Doneda, Kellen Francine Anschau, Gabrielle D. Iop |
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| Rok vydání: | 2017 |
| Předmět: |
Detection limit
Chromatography Bran 010401 analytical chemistry Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound Certified reference materials chemistry Inductively coupled plasma atomic emission spectroscopy Sample preparation Inductively coupled plasma Cellulose 0210 nano-technology Inductively coupled plasma mass spectrometry Spectroscopy |
| Zdroj: | Microchemical Journal. 134:257-261 |
| ISSN: | 0026-265X |
| DOI: | 10.1016/j.microc.2017.06.012 |
| Popis: | A sample preparation method using only H 2 O 2 in the single reaction chamber system (SRC-UltraWave™) was proposed for carbohydrate-rich foods (CRFs) digestion and further elemental determination by inductively coupled plasma (ICP) based techniques. The greenness of the proposed method was evaluated based on the Analytical Eco-Scale. Additionally, the digestion efficiency, obtained under different conditions (temperature and volume of H 2 O 2 ), was evaluated based on the concentration of residual carbon (RC). Determination of RC and major elements (Ca, Fe, Mg and Na) were carried out using inductively coupled plasma optical emission spectrometry (ICP-OES), while the minor and toxic elements (As, Ba, Cd, Co, Cu, Mn, Mo, Pb, Sr and Zn) were determined by inductively coupled plasma mass spectrometry (ICP-MS). Digests with lower RC were obtained using 8 mL of 50% H 2 O 2 , 250 °C and 199 bar. Residual carbon lower than 250 and 400 mg L − 1 were obtained for honey and different flours (wheat, corn, cassava and potato), respectively. Maxima sample masses of 0.75 g and 1.25 g were efficiently digested (without insoluble residues) for different flours and honey, respectively. Reference materials (RMs) and certified reference material (CRM) with carbohydrate-rich matrices: corn bran (RM NIST 8433), cotton cellulose (RM IAEA V9) and rice flour (CRM NIST 1568a) were used to evaluate the accuracy of the proposed method. Additionally, accuracy was also evaluated by comparison between results obtained using proposed method and those obtained by microwave-assisted wet digestion (MAWD) with concentrated HNO 3 . Significant differences were not observed when comparing the results of the proposed method with reference values of RMs, CRM and MAWD. Limits of detection obtained by the proposed method were suitable for the quality control analysis of CRFs and ranging from 0.0001 μg g − 1 to 30 μg g − 1 . As water and oxygen are the main products of H 2 O 2 with CRFs, final digests are suitable for ICP-based techniques analysis due to its low acidity and consequent reduction of physical interferences on nebulization devices. Finally, according to the Analytical Eco-Scale, the proposed method was considered an excellent green analysis with final score of 85. |
| Databáze: | OpenAIRE |
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