Color measurement
Color parameters of PPW flour were measured with a Portable Colorimeter with unmatched ruggedness and application flexibility (KONICA MINOLTA, CHROMA METER CR-410 Japan) on the basis of L∗, a∗ and b∗ values. After calibration, the sample was placed on a holding device. L∗ value indicates the lightness, a∗ value gives the degree of the red–green color. The b∗ value indicates the degree of the yellow–blue color. Color analyses were performed on samples treated three times at the same process conditions and the mean values together with the standard deviations reported (Bouaziz et al., 2016).