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Swelling-solubility characteristics, granule size distribution and rheological behavior of banana (Musa paradisiaca) starch

by: M. C. Núñez-Santiago, L. A. Bello-Pérez, A. Tecante
Carbohydrate Polymers, Vol. 56, No. 1. (May 2004), pp. 65-75, doi:10.1016/j.carbpol.2003.12.003  Key: citeulike:11319742

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Abstract

The rheological behavior at 25 and 60 °C together with the pasting properties of banana starch were examined through DSC, Brabender profile, swelling-solubility characteristics, granule size distribution and steady and oscillatory flow of pastes with 1–6% starch. Some of these properties and behaviors were also determined in cornstarch pastes for the purpose of comparison. The temperature of starch gelatinization was 75 °C and pastes were stable to thermal and mechanical treatment. Swelling and solubility were about 14% and 25 g/g, respectively. The median diameter D [v, 0.5] of the uncooked starch was 24.31 μm, while that of cooked starch ranged from 59 to 66 μm depending on starch concentration. The pastes exhibited non-Newtonian shear thinning behavior that could be fitted to the Cross model. Under oscillatory shear, pasted exhibited a solid-like viscoelastic behavior mainly attributed to the volume fraction of swollen granules. Pastes are a mixture of swollen and partially disrupted granules suspended in a macromolecular solution (60 °C) and in a three-dimensional network (25 °C).


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