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Effects of Microwave-Assisted Extraction Parameters on the Recovery Yield and Total Phenolic Content of Vernonia amygdalina Leaf Extracts with Different Methods of Drying

Alara, Oluwaseun Ruth and Nour, A. H. and Siti Kholijah, Abdul Mudalip and Olalere, Olusegun Abayomi (2018) Effects of Microwave-Assisted Extraction Parameters on the Recovery Yield and Total Phenolic Content of Vernonia amygdalina Leaf Extracts with Different Methods of Drying. Jundishapur Journal of Natural Pharmaceutical Products. pp. 1-11. ISSN 1735-7780 (In Press)

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Abstract

Vernonia amygdalina leaf has a significant importance in food and traditional medicine. It has been reported to possess various pharmacological effects. This study was carried out to investigate the influence of microwave-assisted extraction factors on the extraction from V. amygdalina leaves. The results highlighted that an increase in temperature deteriorated the yields of V. amygdalina leaf. Thus, shade-dried samples gave the highest yields at the irradiation times of 10 and 2 min, microwave power of 500 and 600W, the temperature of 100 and 80°C, the feed-to-solvent ratio of 1:10, and ethanol concentration of 60% v/v using water and ethanol as the extracting solvents, respectively. Likewise, the antioxidant assay resulted in IC50 values of 260_1.1 _g/mL DPPH and 149.78_0.81_g/mL ABTS for water and 204_0.92_g/mL DPPH and 31.17_1.4_g/mL ABTS for ethanol. Therefore, the synergistic mechanism of mass and heat transfer may be accounted for the accelerated extraction due to microwave.

Item Type: Article
Uncontrolled Keywords: Vernonia amygdalina, Extraction, Yield, Drying, Antioxidant
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Centre of Excellence: Centre of Excellence for Advanced Research in Fluid Flow
Faculty of Chemical & Natural Resources Engineering
Institute of Postgraduate Studies
Depositing User: Noorul Farina Arifin
Date Deposited: 14 Jan 2019 00:52
Last Modified: 10 Sep 2019 04:05
URI: http://umpir.ump.edu.my/id/eprint/23754
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