Journal
CARBOHYDRATE POLYMERS
Volume 94, Issue 1, Pages 594-602Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.12.060
Keywords
Chestnut; Castanea sativa Mill; Starch; Physico-chemical composition; Crystallinity; Pasting
Categories
Funding
- Foundation for Science and Technology (FCT) [POCTI-SFA-3-616]
- COMPETE
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Starch isolation methods can change their physico-chemical and functional characteristics hindering the establishment of a starch-food functionality relation. A simple high yield and soft isolation method was applied for chestnut (Castanea sativa Mill) starch consisting in steeping and fruit disintegration in a 25 mM sodium bisulfite solution and purification by sedimentation. Starch integrity, physico-chemical composition, morphology and functional properties were determined, being observed significant differences from previous described methods for chestnut starch isolation. The X-ray pattern was of B-type, with a degree of crystallinity ranging from 51% to 9%, dependent on the starch moisture content. The onset, peak, and conclusion gelatinization temperatures were 57.1 degrees C, 61.9 degrees C and 67.9 degrees C, respectively. Total amylose content was 26.6%, and there was not found any evidence for lipid complexed amylose. Swelling power at 90 degrees C was 19 g/g starch, and the amount of leached amylose was 78% of the total amylose content. Native chestnut starch presents a type B pasting profile similar to corn starch but with a lower gelatinization (56.1 degrees C) and peak viscosity (79.5 degrees C) temperatures, making native chestnut starch a potential technological alternative to corn starch, especially in application where lower processing temperatures are needed. (C) 2013 Elsevier Ltd. All rights reserved.
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