Abstract
This research used a multi-method approach to analyse the influence of different moisture levels (low, medium and high) on the structural and functional properties of cellulose with cell wall materials such as pectin, lignin, and hemicellulose present in citrus fibres. The influence of the drying and purification processes and the source of the citrus fibres on these interactions were also considered. A fluidized bed dryer results in a higher aggregation of cellulose fibres, which limits their interactions with water, pectin, lignin, and hemicellulose. Citrus fibre suspension produce by a alcohol washing in combination with a centrifugal drying process showed higher storage modulus (G'), loss modulus (G'') and water retention capacity. The compositions of the citrus fibres and the type of hydrogen bonding (analysed by FTIR) play a key role in generating stable rheological and thermal properties as well as controlling the moisture sorption behaviour of the citrus fibres.
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