Journal
FOOD HYDROCOLLOIDS
Volume 47, Issue -, Pages 115-123Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2015.01.009
Keywords
Orange pulp fibers; High-pressure homogenization; Emulsifying properties; Rheology
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Funding
- Cargill Texturizing Systems
- Cargill Global FIS Research organisation
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The present work describes the emulsifying properties of dried orange pulp fibers. Their surface activity is believed to originate from the proteins (similar to 8%) and pectins (similar to 35%), while the cellulose (>45%) enables the fibers to act as thickener. The surface activity of the dried fibers was compared to the one of their pre-activated counterparts. High pressure homogenization at 700 bar prior drying was used for this, which allowed obtaining significantly finer emulsions. Rheology of the emulsions demonstrated that at same fiber: water ratio, a critical concentration (c*) of 3.1 wt% was found when using pre-activated fibers. This corresponded well with the c* of suspensions without oil. The non-activated fiber emulsions had a much higher c*. Interestingly, no coalescence could be observed at room temperature during 2 weeks when G' reached 345 Pa. CLSM imaging demonstrated increased amounts of proteins at the oil-water interface in activated fiber emulsions, which explained their higher surface activity. (C) 2015 Elsevier Ltd. All rights reserved.
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