Abstract
Extrusion processing was used to produced a range of partly depolymerized amylopectins. The extent of depolymerization was characterized by size-exclusion chromatography and viscometry. The products formed thermoreversible gels on cooling concentrated solutions (15-50%; w/w) to 1°C. The rate of gelation was monitored by measuring the increase in gel stiffness with time, which, in the range tested (103 Pa < shear modulus < 105 Pa), was independent of the extent of depolymerization. The extent of chain association in the gelled materials was probed by differential scanning calorimetry, which showed transitions associated with an annealing process, gel melting and the co-operative melting of crystallites.
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