The aqueous packed-bed extraction of bioactive compounds from yerba mate leaves was evaluated given their potential application in the food industry. The influence of temperature (50–70 °C) and feed flow rate (10–20 cm3/min) was investigated by central composite design. A mathematical model derived from the differential equation of mass conservation in solid and liquid phases was used to describe the concentration of total phenolic concentration over time, considering a finite volume-based algorithm to solve this multiscale model along the column length and particle radius. The findings demonstrated that higher temperatures improved bioactive chemical extraction yields, although feed flow rate played a role at low temperatures because it improved external mass transfer. Caffeic acid, caffeine, and chlorogenic acid were the principal bioactive chemicals studied, with the highest concentrations extracted being 156.3 × 10−2, 273.5 × 10−2, and 351.6 × 10−2 mg/gYM (mg of bioactive per g of yerba mate), respectively, obtained after 60 minutes of extraction process at 70 °C and a flow rate of 10 cm3/min. The amount of these predominant bioactive compounds extracted exceeded 90% of the total content that could be obtained using water as a solvent. The mathematical model evaluated showed relative mean errors lower than 3% and R2 higher than 98%, suggesting a good fit for the experimental data, with the external mass transfer and effective intraparticle diffusion coefficients ranging between 8.75 × 10−8 to 1.77 × 10−6 m/s and 9.34 × 10−11 to 3.06 × 10−9 m2/s, respectively.
Citation: Luiza H. P. Domingues, Matheus S. T. Arantes, Geovana S. Marques, Charles W. I. Haminiuk, Eliton Fontana, Vitor R. da Silva. Extraction of bioactive compounds from yerba mate (Ilex paraguariensis St.-Hil.) leaves by packed-bed extractor using hot water as solvents: Kinetics study and mathematical modeling[J]. AIMS Molecular Science, 2024, 11(1): 42-60. doi: 10.3934/molsci.2024003
The aqueous packed-bed extraction of bioactive compounds from yerba mate leaves was evaluated given their potential application in the food industry. The influence of temperature (50–70 °C) and feed flow rate (10–20 cm3/min) was investigated by central composite design. A mathematical model derived from the differential equation of mass conservation in solid and liquid phases was used to describe the concentration of total phenolic concentration over time, considering a finite volume-based algorithm to solve this multiscale model along the column length and particle radius. The findings demonstrated that higher temperatures improved bioactive chemical extraction yields, although feed flow rate played a role at low temperatures because it improved external mass transfer. Caffeic acid, caffeine, and chlorogenic acid were the principal bioactive chemicals studied, with the highest concentrations extracted being 156.3 × 10−2, 273.5 × 10−2, and 351.6 × 10−2 mg/gYM (mg of bioactive per g of yerba mate), respectively, obtained after 60 minutes of extraction process at 70 °C and a flow rate of 10 cm3/min. The amount of these predominant bioactive compounds extracted exceeded 90% of the total content that could be obtained using water as a solvent. The mathematical model evaluated showed relative mean errors lower than 3% and R2 higher than 98%, suggesting a good fit for the experimental data, with the external mass transfer and effective intraparticle diffusion coefficients ranging between 8.75 × 10−8 to 1.77 × 10−6 m/s and 9.34 × 10−11 to 3.06 × 10−9 m2/s, respectively.
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