Complex formation between amylomaize dextrin and n-butanol by phase separation system

Crystalline dextrin–butanol particles were prepared through a complex formation using separated phases of an aqueous dextrin solution and n-butanol. The dextrin concentration and temperature for the complex formation were important parameters to determine the matrix structure of the complex. When dextrin concentration was relatively high (2 or 3%) and the temperature was low (25 °C), amorphous or B-type crystalline particles were produced. However, at a lower dextrin concentration (1%) and a higher temperature (50 or 70 °C), VH crystalline particles with d-spacings of 1.123, 0.657, and 0.429 nm were produced. Mechanical stirring during the complex formation resulted in smaller size (less than 200 nm) and higher yield (more than 50% based on dextrin) of the complex. The complex particles had rectangular shapes with sizes less than 200 nm, and mainly consisted of long and linear dextrins.