A generalized energy-based kinetic model for microwave-assisted extraction of bioactive compounds from plants

Chan, Chung-Hung and Lim, Jian-Jiun and Yusoff, R. and Ngoh, Gek-Cheng (2015) A generalized energy-based kinetic model for microwave-assisted extraction of bioactive compounds from plants. Separation and Purification Technology, 143. 152 - 160.

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Abstract

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 normalized 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 solvent (85% aqueous ethanol) and solvent to feed ratio (50 mL/g).

Item Type: Article
Uncontrolled Keywords: Absorbed power density (APD); Absorbed energy density (AED); Generalized model; Heating modes; Normalized extraction yield
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Dr. Chung-Hung Chan
Date Deposited: 03 Apr 2015 01:53
Last Modified: 31 Dec 2018 12:15
URI: http://eprints.um.edu.my/id/eprint/13169

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