Morphological, structural and functional properties of starch granules extracted from the tubers and seeds of Sphenostylis stenocarpa. (15th December 2017)

• Record Type: Journal Article
• Authors: Malumba, Paul; Doran, Lynn; Zanmenou, Wilfried; Odjo, Sylvanus; Katanga, Joseph; Blecker, Christophe; Béra, François
• Is Part Of: Carbohydrate polymers. Volume 178(2017)
• Page Start: 286
• Page End: 294
• Publication Date: 2017-12-15
• Subjects: Sphenostylis -- Seed -- Tuber -- Starch -- Granules -- Property; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2017.09.013
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Tuber and seed starch from Sphenostylis stenocarpa were characterized and compared. With smaller granules, tuber starch displayed higher resistance toward amylolysis. The amylolysis of seed starch resulted in fragmented granules with growth ring structures. Both seed and tuber starch displayed outstanding thermal resistances in excess water. Depending on the storage organ, starch produced differed on several characteristics. Abstract: Sphenostylis stenocarpa (Hochst. ex A. Rich.) Harms, is a legume widely recognized in Africa for its edible starchy tuber and seeds. In the present morphological, structural and functional properties of starch extracted from the tubers and seeds of a same accession of this plant were characterized and compared. With smaller and more angular granules, tuber starch displayed higher resistance toward amylolysis and gelatinization than seed starch. The amylolysis of seed starch resulted in fragmented granules with typical layered structures of growth rings. During their hydrothermal treatments, both tuber and seed starches showed condensed ghosts even at 95 °C. This high resistance toward hydrothermal degradation was considered as the basis of the typical pasting properties of these two materials. Both seed and tuber starch exhibited A-type crystalline pattern. Under non-oxidative combustion tuber starch presented a degradation peak at 310 °C while seed starch was degraded around 302 °C.