The size OSA modified starches was measured by dynamic light
scattering (DLS) using a Zetasizer Nano Series (Malvern Instruments,
UK). The particle size distributions of the rice starch
particles was determined by laser diffraction after dispersing the
powders in water at a concentration of 1wt% and using a Malvern
Mastersizer 2000 with a Hydro SM manual small volume dispersion
unit attached (Malvern Instruments, UK). A refractive index
(RI) of starch of 1.53 (Bromley & Hopkinson, 2002) was used for the
measurement.