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In vitro digestibility, physicochemical, thermal and rheological properties of banana starches

Author:
Utrilla-Coello, R.G., Rodríguez-Huezo, M.E., Carrillo-Navas, H., Hernández-Jaimes, C., Vernon-Carter, E.J., Alvarez-Ramirez, J.
Source:
Carbohydrate polymers 2014 v.101 pp. 154-162
ISSN:
0144-8617
Subject:
amylose, bananas, crystal structure, cultivars, dispersions, enthalpy, gelatinization, gels, granules, in vitro digestibility, particle size, resistant starch, rheological properties, starch granules, zeta potential
Abstract:
Banana starches (BS) were isolated from Enano, Morado, Valery and Macho cultivars. The BS possessed B-type crystallinity and an amylose content varying from 19.32 to 26.35%. Granules had an oval morphology with different major-to-minor axis ratios, exhibiting both mono- and bi-modal distributions and mean particle sizes varying from 32.5 to 45μm. BS displayed zeta-potential values ranging between −32.25 and −17.32mV, and formed gels of incipient to moderate stability. The enthalpy of gelatinization of BS affected the crystalline order stability within the granules. In-vitro digestibility tests showed fractions as high as 68% of resistant starch. Rheological oscillatory tests at 1Hz showed that BS dispersions (7.0%, w/w) exhibited Type III behaviour, attributed to the formation of a continuous phase complex three-dimensional amylose gel reinforced by swollen starch granules acting as fillers. Amylose content and granules morphology were the main factors influencing the BS properties.
Agid:
5407285