Several food microorganisms such as Bacillus subtilis, Lactobacillus
brevis, and Aspergillus kawachii were tried to elevate the antioxidative
status of yellow A. cepa (data not shown). Significant
changes in anti-oxidative activity were observed only after fermentation
with A. kawachii.
The antioxidative effect was evaluated three ways. The first
one was with the most widely used DPPH assay. DPPH is a