Feasibility of using spectral profiles for modeling water activity in five varieties of white quinoa grains

摘要

In this paper, the feasibility of using spectral profiles for modeling water activityawin white quinoa grains(Chenopodium quinoa Willd.)is studied. For this purpose, five hundred samples of five white varieties were stabilized at differentawvalues using the isopiestic method. Next, hyperspectral images (HSIs) of ten grains for each combination (variety,awvalue), covering the range of 400–1000 nm were acquired, and mean spectral for each grain extracted. Then, due to a linear relationship that the spectral profiles are shown, the modeling was performed withawvalues over 0.741 using partial least square regression (PLSR). From total spectra, three hundred spectrum were selected and randomly divided into training and validation sets. The results shown coefficient of determination from 0.59 to 0.834 concluding than forawover 0.741, HSI + PLSR show potential forawprediction in white quinoa grains.