Characterization of cassava starch processed in an internal mixer
AUTOR(ES)
Silva, Marcia Cristina da, Ascheri, Diego Palmiro Ramírez, Carvalho, Carlos Wanderlei Piler de, Galdeano, Melicia Cintia, Andrade, Cristina Tristão de
FONTE
Polímeros
DATA DE PUBLICAÇÃO
2013
RESUMO
An internal mixer connected to a torque rheometer was used to investigate the effect of moisture content (13.2 to 46.8 g.100g- 1), rotation speed (13.2 to 46.8 rpm) and processing temperature (53.2 to 86.8 °C), applying a factorial central composite design, on the specific mechanical energy (SME), pasting viscosity and crystallinity of cassava starch. Torque values were highly significant for the three variables, showing decrease with increasing moisture, temperature and rpm. The highest cold viscosity (CV) was obtained at 13.18 g.100g- 1 moisture, 86.87 °C and 30 rpm due to increased rupture of starch granules caused by processing at lower moisture condition. Peak viscosity (PV) values were higher than CV values which indicated that the processing was not able to destroy completely the molecular integrity of the starch granules. Smaller setback (SB) at high temperature and rpm and low moisture showed possible starch depolymerization causing loss of recrystallization capacity. Processing under low moisture content resulted in reduction of crystallinity. The results showed that the effect of moisture was more pronounced than rotation speed and processing temperature of cassava starch.
Documentos Relacionados
- Thermal characterization of partially hydrolyzed cassava (Manihot esculenta) starch granules
- Rheological characterization of suspensions of cassava starch and maize starch with purified cashew tree gum.
- Resistant starch in cassava products
- Preparation and characterization of biodegradable composites based on Brazilian cassava starch, corn starch and green coconut fibers
- Cassava and corn starch in maltodextrin production