Microwave-assisted extraction of phenolics from Hibiscus sabdariffacalyces : kinetic modelling and process intensification

Alara, Oluwaseun Ruth and Nour, A. H. (2019) Microwave-assisted extraction of phenolics from Hibiscus sabdariffacalyces : kinetic modelling and process intensification. Industrial Crops and Products, 137. pp. 528-535. ISSN 0926-6690. (Published)

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Hibiscus sabdariffa is a multi-cropping system endowed with wide ranges of benefits to humans. Being a plant rich in phenolic compounds, the process intensification of extraction method used for recovering the phenolic compounds from this essential plant is inevitable to easily proffer keen information on the extraction behaviours. Thus, the process intensification and kinetic behaviour of microwave-assisted extraction (MAE) for recuperating total phenolics (TP) content from H. sabdariffa calyces were investigated. The impacts of MAE factors such as solid/sample ratio, microwave power and temperature at varied irradiation time were studied. The effective diffusivity was also estimated. In addition, the extract was characterized to tentatively assign the phenolics using Liquid chromatography tandem mass spectrometry of quadrupole time-of-flight (LC-ESI-MS-MS). The achieved results clearly indicated that the MAE process intensification was acheived with TP content of 70.53 mg GAE/g extract in 3 min at solvent/sample ratio of 14:1 mL/g, microwave power of 500 W and 60 °C of temperature where the highest effective diffusivity coefficient was obtained. Out of the two considered kinetic models (second-order rate and power law), the second-order rate model best describes the MAE process intensification with higher coefficients of determination (R2 > 0.99). Moreover, an aggregate of 77 phenolic compounds was assigned in the extract of H. sabdariffa calyx; signifying the wider potentials of the extract industrially. Thus, this study clearly outlined that H. sabdariffa calyx is an embodiment of diverse phenolic compounds; indicating its potential in pharmaceutical and food industries.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Microwave-assisted extraction; Hibiscus sabdariffa; Second-order rate law; Effective diffusivity; Power law; LC-ESI-MS-MS
Subjects: Q Science > QD Chemistry
Q Science > QK Botany
T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Institute of Postgraduate Studies
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 04 Jul 2019 03:22
Last Modified: 28 Feb 2020 07:51
URI: http://umpir.ump.edu.my/id/eprint/25203
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