Ladd-Parada, M, Povey, MJ orcid.org/0000-0002-9740-2596, Vieira, J et al. (1 more author) (2019) Fast Field Cycling NMR relaxometry studies of molten and cooled cocoa butter. Molecular Physics, 117 (7-8). pp. 1020-1027. ISSN 0026-8976
Abstract
Due to its relevance in the confectionery industry, cocoa butter (CB) has been extensively studied. However, most studies focus on its crystallisation properties, whilst studies of its liquid state are lacking. Here, and for the first time, a study of the self-diffusion of CB at different temperatures is presented, using fast field cycling (FFC) nuclear magnetic resonance (NMR) further validated using pulsed field gradient stimulated echo (PGSTE) NMR. Measurements were performed upon heating CB to either 50 or 100 °C and cooling it to 22 °C. No hysteresis was found between the different thermal treatments. However, the activation energy (28.7 kJ/mol) estimated from the cooling protocol of the 100 °C treatment, was the closest to that reported in literature for similar systems. This suggests that measurements using a wider range of temperatures, and starting with a liquid material are advisable. Additionally, samples were measured during isothermal crystallisation at 22 °C, showing that the region below 1 MHz is the most sensitive to phase changes
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Informa UK Limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in Molecular Physics on 14 Aug 2018, available online: https://doi.org/10.1080/00268976.2018.1508784 |
Keywords: | cocoa butter, triacylglycerols, diffusion, FFC-NMR |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Food Science and Nutrition (Leeds) > FSN Colloids and Food Processing (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Soft Matter Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 31 Jul 2018 13:29 |
Last Modified: | 14 Aug 2019 00:43 |
Status: | Published |
Publisher: | Taylor & Francis |
Identification Number: | 10.1080/00268976.2018.1508784 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:133969 |