A Generalized Energy-Based Kinetic Model for Microwave-Assisted Extraction of Bioactive Compounds from Plants
Separation and Purification Technology, Vol. 143, p. 152-160, 2015
22 Pages Posted: 14 Mar 2017
Date Written: February 22, 2015
By considering the absorbed power and energy based on heating power profile during extraction, a generalized model with washing coefficient (b), diffusion coefficient (k) and predictive parameter namely absorbed power density (APD) was developed for microwave-assisted extraction (MAE) at any operational heating modes. To study the model, MAE of flavonoids from cocoa (Theobroma cacao L.) leaves was conducted using the heating modes (constant-power, two-steps-power, intermittent-power and constant-temperature) at various microwave power (100-300 W) and extraction temperature (50 °C and 70 °C). The results shows that the model (b = 0.5595 and k ’ = 0.01279 ml/J) is able to predict the normalised extraction yields of MAE at any heating modes, heating power, microwave system, extraction scale and batch of plant sample with less than 4% discrepancy. The accuracy of the prediction relies on particle size of sample (0.25-0.60 mm), type of extraction (85% ethanol) and solvent to feed ratio (50 ml/g).
Keywords: Absorbed Power Density (APD), Absorbed Energy Density (AED), Generalized Model, Heating Modes, Normalized Extraction Yield
JEL Classification: C61, A00, B00, C90, I20, Q20, Q00, Q16, Q32
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