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
2021
Cerqueira da Silva, Vinnícius Henrique | Sampaio da Silva junior, André Luiz | Pinheiro Lôbo, Ivon | Galvao Paranhos da Silva, Erik | Almeida Bezerra, Marcos | Gonçalves Silva, Allison | da Silva Lima, Luciano | Mota de Jesus, Raildo
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 (HNO₃), 1.80 mL (H₂O₂), 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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