Several investigators and some individual enterprises have been studying how to use OC as
a new type of food, or in another industrial fields. For example, Maeda Y. developed a
method of extracting water-soluble polysaccharides from OC and used them as an emulsifer
or viscoelastic reagent (Maeda, 1992). Matsuo M. investigated the composition and
properties of OC fermented by Aspergillus oryzae (A. oryzae) and Rhizopus oligosporus (R.
oligosporus) and reported that the fermented OC could be a useful high-fiber, low-energy
food material (Matsuo, 1989a; 1989b). Tempeh, a soy-based food originating in Indonesia,
also is fermented by R. oligosporus. Today, it is still the most popular soy-based protein food
in Indonesia (Golbitz, 1995). The antioxidant activity of OC fermented by A. oryzae also has