The average size and zeta potential of traditional soymilk particles
are ~0.5 mm and _20 mV, respectively (Ringgenberg, Corredig, &
Alexander, 2012). Given that no pre-extraction heat is involved,
the native soy proteins extracted from imbibed soybean seeds are
in hydrated forms and suspended in water as protein body fractals
(Saio & Watanabe, 1966). As discussed in Section 2, 7S and 11S are
simultaneously denatured in one step, during which the particles of
raw soymilk are disrupted and form new particles. Thus, the
physicochemical characteristics of traditional soymilk particles
cannot be determined until the completion of post-extraction
heating.