Journal
CARBOHYDRATE POLYMERS
Volume 128, Issue -, Pages 32-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.04.019
Keywords
Banana; Starch; Microscopy; Structure
Categories
Funding
- FAPESP
- PNPD/CAPES
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Atomic force microscopy (AFM) is a high resolution technique for studying the external and internal structures of starch granules. For this purpose granules were isolated from bananas and embedded in a non-penetrating resin. To achieve image contrast of the ultrastructure, the face of the cut blocks were wetted in steam and force modulation mode imaging was used. Images of starch from green bananas showed large variation of height across the granule due to a locational specific absorption of water and swelling of amorphous regions; the data reveal that the center of the granules are structurally different and have different viscoelastic properties. Images of starches from ripe bananas showed an even greater different level of organization: absence of growth rings around the hilum; the central region of the granule is richer in amylose; very porous surface with round shaped dark structures; the size of blocklets are larger than the green fruits. (C) 2015 Elsevier Ltd. All rights reserved.
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