METHODS AND APPARATUS FOR MEASURING AND EVALUATING THE AMOUNT OF BRAN WITH HIGH PRECISION

摘要

PURPOSE: Methods and apparatus for measuring and evaluating the amount of bran are provided, thereby measuring the amount of bran remaining on sample rice (polished rice, non-bran rice, etc.) with high precision. CONSTITUTION: The method for measuring the amount of bran in rice washing water with which the rice has been washed comprises the steps of: measuring the intensity of fluorescence emitted by ferulic acid contained in the rice washing water when the rice washing water is exposed to ultraviolet light and the ferulic acid is excited by the ultraviolet light; and determining the amount of bran in the rice washing water based on the measured value of the intensity of fluorescence, wherein the wave length of the ultraviolet light to which the rice washing water is exposed is in the range of 330 to 340 nm and the wave length of the fluorescence whose intensity is to be measured is in the range of 430 to 450 nm. The method for evaluating the amount of bran remaining on sample rice comprises the steps of: measuring the intensity of fluorescence emitted by ferulic acid, which is contained in rice washing water with which the sample rice has been washed, when the rice washing water is exposed to ultraviolet light; and determining the amount of bran contained in the sample rice by comparing the measured value of the intensity of fluorescence with the predetermined standard value.