As consumer interest in natural food, in which no synthetic chemicals are used, is increasing, a traditional soy protein isolate (SPI) was prepared from full-fat flour, using amaranth (Amarathus tricolor L.) ash and lemon (Citrus limon) extracts as alternatives to NaOH and HCl, respectively.
SpectrumTM descriptive analysis revealed some distinctive characteristics of the traditional SPI compared to those of conventional and commercial SPIs. Principal component analysis (PCA) results accounted for 90.11% of the samples variability on a two dimensional component space based on the attribute eigenvector loadings of ≥ 0.3, and associated the traditional SPI with opacity, pasta, sweet, sour, and bitter (principal component 1, 55.14%), but not color, cardboard, cereal, brothy, ashy, astringent, salty, and viscosity, which were also characteristic to the conventional and commercial SPIs (principal component 2, 36.53%). That’s the traditional SPI had comparatively no unique characteristic that would affect its application in food systems.