1. Introduction
Soymilk is widely consumed in East Asian countries as a traditional protein beverage and as raw material for tofu production.
Imbibed soybean seeds are ground in water to produce a viscous
slurry. After removal of insoluble residuals (okara) from the slurry,
the aqueous dispersion (raw soymilk) is boiled for several minutes to obtain soymilk.
Soymilk is a colloidal system that comprises ~3%
proteins, ~2% fats, ~2% non-lactose carbohydrates, and minerals
(Giri&Mangaraj, 2012). Aside from having these macronutrients,
soymilk is rich in bioactive compounds such as isoflavone and
saponin. These components provide multiple health benefits,
including the ability of soymilk to lower blood cholesterol level and
to reduce the risk of cardiovascular diseases (Ang, Kwik,&Theng,
1985; Friedman&Brandon, 2001). Soymilk has recently become
popular in Western countries because of its high nutritional value
and health benefits