NO scavenging activity. NO reactive nitrogen species are formed during reactions with oxygen or with superoxide, and NO2, N2O4, N3O4, NO3- and NO2- are very reactive. These compounds are responsible for altering the structures and functional behaviors of many cellular components (Kumaran & Karunakaran, 2007). Overall, NO scavenging activity of four TK groups gradually increased during 16 weeks of fermentation (Fig. 3c). In studies with kimchi, Sin and Han (2008) also found higher NO scavenging activity after fermentation than before fermentation. Before fermentation, no significant differences in NO scavenging activity (34.4–35.9%) were observed among four TK groups (Fig. 3). After 16 weeks, however, 1:1 TK-L showed the highest NO scavenging activity (73.1%) followed by 1:0.5 TK-L (66.8%), 1:1 TK (55.4%) and 1:0.5 TK (51.9%). Such trend was also observed in DPPH radical scavenging activity.