RICE AMYLOSE ANALYSIS BY NEAR-INFRARED TRANSMITTANCE SPECTROSCOPY

Apparent amylose content (AC) of milled rice is an important index of cooking and eating quality of rice. The standard iodine colorimetric a nalysis has not given close correspondence among laboratories. Near-in frared transmittance spectroscopy of unground brown rice or milled ric e was demonstrated to adequately screen for AC in a breeding program. Calibration of milled rice was more readily transferred to other units than that of brown rice, probably due to interference from bran in br own rice. Amperometric iodine titration of defatted milled rice is pro posed as an alternative to colorimetric iodine assay of AC of check sa mples to be used in the iodine colorimetric assay, in place of potato amylose-waxy rice mixtures.