These
compounds act as antioxidants. However, they are more lipophilic
and their antioxidant activities are relatively lower than that of
carnosic acid (Huang et al., 1996). However, their activity is more
important if they are subjected to high temperatures such as at frying
(Nogala-Kalucka et al., 2005). Several degradation products are
likely to be created once the temperature exceeds 100 ◦C. Some of
these products are active as antioxidants