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Architectural changes of heated mungbean, rice and cassava starch granules: Effects of hydrocolloids and protein-containing envelope
- Hongsprabhas, P., Israkarn, K., Rattanawattanaprakit, C.
- Carbohydrate polymers 2007 v.67 no.4 pp. 614-622
- starch granules, heat treatment, amylose, proteins, alginates, carrageenan, pasting properties, hydrocolloids, microstructure, mung beans, starch, rice starch, cassava starch, Oryza sativa, Manihot esculenta, Vigna radiata, viscosity, mixtures, texture, swelling (materials)
- Architectural changes of starch granules induced by heat were demonstrated using light microscopy and confocal laser scanning microscopy. Heat treatment (80 °C, 30 min) on mungbean starch, cassava starch and rice flour suspensions resulted in the rearrangement of amylose and granule-associated proteins within the deformed granules. The presence of alginate and carrageenan influenced the RVA pasting characteristics of starch/flour-hydrocolloid mixed suspensions by maintaining the granular structure of amylose-rich swollen granules or inducing the aggregation of the swollen ones. Generally, the addition of hydrocolloid increased peak viscosity, lowered breakdown and reduced setback of the flour-hydrocolloid mixed paste. This study demonstrated that the heat treatment in excess water generated the protein-containing granule envelope encasing the mungbean and cassava starch content within the deformed granules.