Thermoplastic starch is almost completely amorphous on extrusion, but if aged above its glass transition temperature, it crystallizes into the B-type structure, with a characteristic peak at 16.8° (2q)15. This structure is preferentially formed by crystallization of the short outer chains of amylopectin. It is also possible to identify another type of crystal structure formed by amylose-containing starches, viz. the V-type, formed by the crystallization of amylose in single helices involving glycerol or lipids16, which occurs during extrusion or cooling. These complexes are responsible for the formation of insoluble materials when blends of starch with polymers like poly (vinyl alcohol) and copolymers of ethylene and vinyl alcohol are made17. The V-type crystalline structure can be divided into two sub-types, namely Va (anhydrous) with peaks at 13.2° plus 20.6° and Vh (hydrated) with peaks at 12.6 and 19.4°.