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 / Online First) (In Press / Online First)
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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 |
| Download Statistic: | View Download Statistics |
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