Chemometric tools in the optimization of a microwave-assisted digestion procedure for guarana-based drink samples and data analysis from elemental, caffeine, and epicatechin contents.

Autor: Cerqueira da Silva VH; State University of Santa Cruz, Department of Exact and Technological Sciences, Research Group in Analytical Chemistry of Southern Bahia, Rodovia Ilhéus-Itabuna, km 16, 45662-900 Ilhéus, Bahia, Brazil., Sampaio da Silva Junior AL; State University of Santa Cruz, Department of Exact and Technological Sciences, Research Group in Analytical Chemistry of Southern Bahia, Rodovia Ilhéus-Itabuna, km 16, 45662-900 Ilhéus, Bahia, Brazil., Pinheiro Lôbo I; State University of Santa Cruz, Department of Exact and Technological Sciences, Research Group in Analytical Chemistry of Southern Bahia, Rodovia Ilhéus-Itabuna, km 16, 45662-900 Ilhéus, Bahia, Brazil., Galvao Paranhos da Silva E; State University of Santa Cruz, Department of Exact and Technological Sciences, Research Group in Analytical Chemistry of Southern Bahia, Rodovia Ilhéus-Itabuna, km 16, 45662-900 Ilhéus, Bahia, Brazil., Almeida Bezerra M; State University of Southwest Bahia, Jequié Campus, Department of Sciences and Technologies, Rua José Moreira Sobrinho s/n, Jequié, Bahia 45.208-091, Brazil., Gonçalves Silva A; Federal Institute of Education, Science and Technology of Bahia - IFBA Porto Seguro, Rod. Br 367Km 57 5, Bairro Fontana I - CEP, 45810-000, Bahia, Brazil., da Silva Lima L; Federal Institute of Education, Science and Technology of Bahia - IFBA Porto Seguro, Rod. Br 367Km 57 5, Bairro Fontana I - CEP, 45810-000, Bahia, Brazil., Mota de Jesus R; State University of Santa Cruz, Department of Exact and Technological Sciences, Research Group in Analytical Chemistry of Southern Bahia, Rodovia Ilhéus-Itabuna, km 16, 45662-900 Ilhéus, Bahia, Brazil. Electronic address: rmota@uesc.br.
Jazyk: angličtina
Zdroj: Food chemistry [Food Chem] 2021 Dec 15; Vol. 365, pp. 130468. Date of Electronic Publication: 2021 Jun 26.
DOI: 10.1016/j.foodchem.2021.130468
Abstrakt: In this work, a method was developed for the determination of Na, K, Ca, Mg, P, S, Fe, Zn, Mn, and Cu by ICP OES and caffeine and epicatechin by HPLC-DAD in industrialized guarana-based beverages. The acid digestion in microwave oven was optimized by constrained mixture design. The optimum volumes found for the reagents were 2.60 mL (HNO 3 ), 1.80 mL (H 2 O 2 ), and 0.60 mL (HCl) for a final volume of 10 mL, resulting in a final digestate with residual acidity of 0.8 mol L -1 and 9% for residual carbon content. The detection limits found for the studied elements were between 0.0010 and 0.050 mg L -1 . Precision (%RSD) was always below 6%. Accuracy was assessed by analyzing a certified reference material and addition and recovery tests. PCA and HCA were applied to caffeine, epicatechin and elemental concentrations aiming to evidence latent information.
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Databáze: MEDLINE
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