Determination of the Proportion of Amylopectin of Sorghum by Dual Wavelength Method

The amylopectin of sorghum was determined by dual wavelength of 622 nm and 550 nm colorimetry through the liquifation and swelling of the amylum by microwave radiation and the determination results indicated that the linearly dependent coefficient of standard curve-R went to 1 and the relative error was only 0.25 %. The repetitiveness and stability of the determination results by this method was better than that by single wave length method.(Tran.by YUE Yang)