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Effect of the alkaline treatment on the ultrastructure of C-type starch granules.

Authors :
Thys RC
Westfahl H Jr
Noreña CP
Marczak LD
Silveira NP
Cardoso MB
Source :
Biomacromolecules [Biomacromolecules] 2008 Jul; Vol. 9 (7), pp. 1894-901. Date of Electronic Publication: 2008 Jun 03.
Publication Year :
2008

Abstract

The effect of alkaline treatment on the ultrastructure of C-type starch granules was investigated during the alkaline extraction of Araucaria angustifolia (pinhao) starch. The efficiency in protein removal was evaluated using intrinsic fluorescence and Kjeldahl's method. In parallel, morphological changes of starch granules were observed using scanning electron microscopy and atomic force microscopy. The starch crystallinity was monitored by wide-angle X-ray scattering and the lamellar structure was studied by small-angle X-ray scattering (SAXS). The paracrystalline model was employed to interpret the SAXS curves. It was found that the granular organization was significantly altered when alkaline solutions were used during the extraction. A partial degradation of B-type allomorph of starch and a significant compression of semicrystalline growth rings were observed.

Details

Language :
English
ISSN :
1526-4602
Volume :
9
Issue :
7
Database :
MEDLINE
Journal :
Biomacromolecules
Publication Type :
Academic Journal
Accession number :
18517249
Full Text :
https://doi.org/10.1021/bm800143w