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

Abstract

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 degrees C), V-H 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. (C) 2010 Elsevier Ltd. All rights reserved.