Abstract
The molar mass ( M w), radius of gyration ( R g), diffusion co-efficient ( D), and hydrodynamic radius ( R h) of amylopectin (waxy maize starch) has been determined using asymmetrical flow field-flow fractionation coupled with multi-angle light scattering and refractive index detectors (AF4/MALS/RI). A high pressure microwave vessel (HPMV) was used to dissolve amylopectin in 1 M KSCN. The effect of varying the flow rates on the M w and R g distributions of amylopectin were investigated to determine the optimum flow rates. The average M w and R g values of amylopectin determined using the Berry and Debye equations. D and R h values were determined directly from the AF4 retention times and compared to values obtained by dynamic light scattering.
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