Combination of Multi-Energy Calibration (MEC) and Laser-Induced Breakdown Spectroscopy (LIBS) for Dietary Supplements Analysis and Determination of Ca, Mg and K

Autor(es)

Augusto, Amanda S. ^[1] ; Castro, Jeyne P. ^[1] ; Speranca, Marco A. ^[1] ; Pereira-Filho, Edenir R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, GAIA, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 30, n. 4, p. 804-812, APR 2019.
• Citações Web of Science: 5

Resumo

This study describes the application of laser-induced breakdown spectroscopy (LIBS) for the direct determination of Ca, K and Mg in powdered dietary supplements. Multi-energy calibration (MEC) method was applied to obtain a calibration curve. With MEC, it was possible to observe spectral interferences and select adequate emission lines from LIBS. For Ca and Mg, five lines were selected and for K just two lines among four could be selected (compromising the results). The trueness for dietary supplements ranged from 81 to 103% for Ca and 74 to 106% for Mg. For K, just the samples S3 (95%) and S5 (109%) showed acceptable trueness values. In the case of Ca and K, besides the MEC, the normalization using C as internal standard also improved the figure of merit results. The MEC and normalization processes showed that possible matrix effect and spectral interferences could be avoided, and the results of trueness and precision were satisfactory. (AU)

• Processo FAPESP: 16/17221-8 - Avaliação da composição de discos rígidos de lixo eletrônico por meio de técnicas espectroanalíticas: determinação de elementos preciosos e terras raras
• Beneficiário: Jeyne Pricylla Castro Castilho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/01513-0 - Combinação de LIBS (Laser-Induced Breakdown Spectroscopy) e ICP OES (Inductively Coupled Plasma Optical Emission Spectrometry) na análise de amostras de resíduo eletrônico (circuito eletrônico e polímeros), alimentos e líquidas de difícil preparação
• Beneficiário: Edenir Rodrigues Pereira Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/11415-0 - Determinação de elementos essenciais e traços em suco de laranja e suplementos alimentares utilizando a técnica LIBS
• Beneficiário: Amanda dos Santos Augusto
• Modalidade de apoio: Bolsas no Brasil - Doutorado