Accuracy in determination of rice constituent contents using near-infrared transmission spectroscopy and improvement in the accuracy

摘要

The accuracy in determination of rice constituent contents using near-infrared transmission (NIRT) spectroscopy was validated. A commercial NIRT spectrometer, which was considered to be applicable to practical use for quality inspection at a rice grain elevator, was used in this study. The accuracy of the spectrometer improved after modifying light filters and calibration models. In the determination of moisture content, the coefficient of determination (r{sup}2) was 0.98, standard error of prediction (SEP) was 0.13%, and bias was -0.02%. In the determination of protein content, r{sup}2 was 0.90, SEP was 0.17%, and bias was 0.01%. These results proved that the spectrometer was sufficiently accurate to be used instead of reference analysis for measuring moisture content and protein content of brown rice. The spectrometer could be also used with sufficiently high accuracy at a grain elevator for samples in a temperature range of 10 °C to 30 °C and for samples with a rough rice percentage of less 10%.