All samples
showed a strong band at 48–52 kDa which was a typical band for
navy bean phaseolin (Rui et al., 2015). The protein profiles of fractions
separated using the solvent-free process were similar to
those of bean flour (Fig. 1), implying that the solvent-free process
preserved the protein content of the original source. However,
the protein profile of NBI, prepared by acid precipitation at its isoelectric
point, and the 7S globulin extracted under acidic conditions,
showed weak bands for proteins with MWs of less than
50 kDa.