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Enhancing natural product extraction and mass transfer using selective microwave heating

Lee, Chai Siah; Binner, Eleanor; Winkworth-Smith, Charles; John, Rebecca; Gomes, R.L.; Robinson, John

Authors

Chai Siah Lee

Charles Winkworth-Smith

BECCA FERRARI Becca.Ferrari@nottingham.ac.uk
Ackroyd Stuart Assistant Professor

RACHEL GOMES rachel.gomes@nottingham.ac.uk
Professor of Water & Resource Processing



Abstract

This study uses a combination of empirical observations and an analysis of mass transfer behaviour to yield new insights into the mechanism of microwave assisted extraction. Enhancements in extraction rate and yield were observed experimentally compared with conventional extraction at temperatures in excess of 50°C, however at lower temperatures there was no observable difference between the two processes. A step-change in extract yield between microwave and conventional processes was shown to be caused by selective heating. A temperature gradient of the order of 1oC is sufficient to reduce the water chemical potential within the cell structure, which changes the osmotic potential such that internal cell pressures can increase to the point where disruption occurs. This paper demonstrates the need to operate microwave extraction processes at a temperature that enables selective heating, and a newly-proposed mass transfer phenomenon that could have wider positive implications for extraction and leaching processes.

Journal Article Type Article
Publication Date Jul 31, 2016
Journal Chemical Engineering Science
Print ISSN 0009-2509
Electronic ISSN 0009-2509
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 149
APA6 Citation Lee, C. S., Binner, E., Winkworth-Smith, C., John, R., Gomes, R., & Robinson, J. (2016). Enhancing natural product extraction and mass transfer using selective microwave heating. Chemical Engineering Science, 149, https://doi.org/10.1016/j.ces.2016.04.031
DOI https://doi.org/10.1016/j.ces.2016.04.031
Keywords Microwave; Extraction; Chemical potential; Osmotic pressure; Selective heating
Publisher URL http://www.sciencedirect.com/science/article/pii/S0009250916301944
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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