Study of moisture content and water activity of rice using fluorescence spectroscopy and multivariate analysis.

The potential of fluorescence spectroscopy for non-destructive and rapid measurement of moisture content (MC) and water activity (a) of rice was examined. A total of n = 15 samples of rice produced at different locations were studied. The emission fluorescence spectra of tryptophan (305-600 nm, excitation: 290 nm) and emission fluorescence spectra of riboflavin (410-700 nm, excitation: 370 nm) were collected from milled rice.