Water penetration into mixed and un-mixed carbohydrate powders
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Many Industrial food-related processes involve the hydration of powders. The penetration of water in both liquid and vapour forms into carbohydrate powders has been studied using the techniques of low-field Time Domain NMR, Dynamic Vapour Sorption, and optical microscopy. A simplified model of water penetration into powders has been produced, principally derived from NMR measurements. No-mixing, mixing and overmixing conditions were studied. There was concurrently a progressive association of solids with the liquid (not necessarily solubilisation) and hydration behaviour approximated by 2 relaxation components in the case of potato flake and 3 components in the case of pre-gelatinised starch. Microscopic evidence is consistent with this behaviour, and the maintenance of structure in potato flake was evident in contrast to the complete dissolution of pre-gelatinised starch. Vapour rather than water sorption removes any capillarity/water meniscus effect and both pre-gelatinised starch and potato flake showed different levels of surface adsorption and penetration behaviour but with the same time course.
Originalsprog | Engelsk |
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Artikelnummer | 100007 |
Tidsskrift | Carbohydrate Polymer Technologies and Applications |
Vol/bind | 1 |
Antal sider | 11 |
ISSN | 2666-8939 |
DOI | |
Status | Udgivet - 2020 |
ID: 316413721