Microwave-assisted extraction of polyphenols from Clinacanthus nutans Lindau medicinal plant: Energy perspective and kinetics modeling

• Published in: Chemical engineering and processing Vol. 97; pp. 66 - 74
• Main Authors: Mustapa, A.N., Martin, A., Gallego, J.R., Mato, R.B., Cocero, M.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2015
• Subjects: Clinacanthus nutans Lindau (C. nutans); Kinetics; Microwave-assisted extraction (MAE); Polyphenols; Specific energy absorbed; Clinacanthus nutans Lindau (C. nutans); Polyphenols; Microwave-assisted extraction (MAE); Kinetics; Specific energy absorbed
• ISSN: 0255-2701; 1873-3204
• DOI: 10.1016/j.cep.2015.08.013

[Display omitted] •Effect of ethanol proportion and solvent-to-feed (S/F) ratio were explained in view of energy absorbed.•Specific energy absorbed (J/g) provide better understanding to explain effect of microwave treatment yield.•A 50%vol was the optimum ethanol–water proportion with the best of 14mL/g.•Patricelli’s model provided an accurate modeling of polyphenols extraction kinetics. Clinacanthus nutans Lindau (C. nutans, “snake grass”) is a well-known medicinal plant in South-East Asia that recently has attracted attention for its high polyphenol content and its medical and nutraceutical applications. In this work, polyphenols have been recovered from C. nutans by microwave-assisted extraction (MAE). The influence of the main process parameters has been analyzed: ethanol concentration in the extraction solvent mixture, microwave energy applied and solvent-to-feed ratio. Model results have been correlated with mathematical models of the extraction process, that allow linking the observed variations in extraction curves with modifications of mass transfer and equilibrium parameters. Moreover, in order to assess the energy efficiency of the process, results were studied and explained in view of the specific energy absorbed during the microwave treatment (J/g). Results indicate that microwave pre-treatment improves extraction rate by a factor of 2–5, yielding the best results when a water–ethanol solvent mixture with 50%vol of ethanol is used at a solvent-to-feed ratio (S/F) of 14mL/g.