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
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...
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| Format: | Article |
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Elsevier
2017
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| Online Access: | https://eprints.nottingham.ac.uk/41904/ |
| _version_ | 1848796379739062272 |
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| author | Galan, Ana-Maria Calinescu, Ioan Trifan, Adrian Winkworth-Smith, Charles Calvo-Carrascal, Miguel Dodds, Chris Binner, Eleanor |
| author_facet | Galan, Ana-Maria Calinescu, Ioan Trifan, Adrian Winkworth-Smith, Charles Calvo-Carrascal, Miguel Dodds, Chris Binner, Eleanor |
| author_sort | Galan, Ana-Maria |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:47:03Z |
| format | Article |
| id | nottingham-41904 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:47:03Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-419042020-05-04T18:38:06Z https://eprints.nottingham.ac.uk/41904/ 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 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. Elsevier 2017-03-16 Article PeerReviewed Galan, Ana-Maria, Calinescu, Ioan, Trifan, Adrian, Winkworth-Smith, Charles, Calvo-Carrascal, Miguel, Dodds, Chris and Binner, Eleanor (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 & Processing: Process Intensification, 116 . pp. 29-39. ISSN 0255-2701 Microwave-assisted extraction (MAE); Sea buckthorn leaves; Polyphenolic compounds; Antioxidant activity; Selective heating; Dielectric properties https://doi.org/10.1016/j.cep.2017.03.006 doi:10.1016/j.cep.2017.03.006 doi:10.1016/j.cep.2017.03.006 |
| spellingShingle | Microwave-assisted extraction (MAE); Sea buckthorn leaves; Polyphenolic compounds; Antioxidant activity; Selective heating; Dielectric properties Galan, Ana-Maria Calinescu, Ioan Trifan, Adrian Winkworth-Smith, Charles Calvo-Carrascal, Miguel Dodds, Chris Binner, Eleanor 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 |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Microwave-assisted extraction (MAE); Sea buckthorn leaves; Polyphenolic compounds; Antioxidant activity; Selective heating; Dielectric properties |
| url | https://eprints.nottingham.ac.uk/41904/ https://eprints.nottingham.ac.uk/41904/ https://eprints.nottingham.ac.uk/41904/ |