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New insights into the role of selective and volumetric heating during microwave extraction: investigation of the extraction of polyphenolic compounds from sea buckthorn leaves using microwave-assisted extraction and conventional solvent extraction

Galan, Ana-Maria; Calinescu, Ioan; Trifan, Adrian; Winkworth-Smith, Charles; Calvo-Carrascal, Miguel; Dodds, Chris; Binner, Eleanor

Authors

Ana-Maria Galan

Ioan Calinescu

Adrian Trifan

Charles Winkworth-Smith

Miguel Calvo-Carrascal

Chris Dodds chris.dodds@nottingham.ac.uk

Eleanor Binner Eleanor.Binner@nottingham.ac.uk



Abstract

We report a direct comparison of microwave heating and conventional heating in solvent extraction by using exactly the same reaction conditions (including heating rate) in the extraction of polyphenols from dried sea buckthorn leaves. We have for the first time decoupled the effects of bulk heating rate and mixing regime from the fundamental microwave heating mechanism. We show that although microwave selective heating can increase the yield and quality of the polyphenols extracted, if the same bulk heating rate is applied there is no difference in treatment time and therefore theoretical energy requirements of the process. The first implication of these results for process intensification is that if microwave selective heating can be enhanced in scaled up processes through electromagnetic design, the extract yield and quality may be increased further. The second implication is that conventional extraction processes could be designed to provide the same heating rate and hence treatment time as microwave extraction, but any potential energy and space savings would have to be balanced against the increase in capital cost and complexity of the equipment. That said, the very small penetration depth of microwaves into ethanol/water solvent also poses design challenges in the scale up of microwave equipment.

Journal Article Type Article
Publication Date 2017-06
Journal Chemical Engineering and Processing: Process Intensification
Electronic ISSN 0255-2701
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 116
Pages 29-39
APA6 Citation Galan, A., Calinescu, I., Trifan, A., Winkworth-Smith, C., Calvo-Carrascal, M., Dodds, C., & Binner, E. (2017). New insights into the role of selective and volumetric heating during microwave extraction: investigation of the extraction of polyphenolic compounds from sea buckthorn leaves using microwave-assisted extraction and conventional solvent extraction. Chemical Engineering and Processing: Process Intensification, 116, 29-39. https://doi.org/10.1016/j.cep.2017.03.006
DOI https://doi.org/10.1016/j.cep.2017.03.006
Keywords Microwave-assisted extraction (MAE); Sea buckthorn leaves; Polyphenolic compounds; Antioxidant activity; Selective heating; Dielectric properties
Publisher URL https://doi.org/10.1016/j.cep.2017.03.006
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0
Additional Information This article is maintained by: Elsevier; Article Title: New insights into the role of selective and volumetric heating during microwave extraction: Investigation of the extraction of polyphenolic compounds from sea buckthorn leaves using microwave-assisted extraction and conventional solvent extraction; Journal Title: Chemical Engineering and Processing: Process Intensification; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.cep.2017.03.006; Content Type: article; Copyright: © 2017 Elsevier B.V. All rights reserved.

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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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