Several studies in this context
have shown that the rosemary extracts added to the frying oil can inhibit the decomposition of polyunsaturated triacylglycerols,
inducing the formation of polar compounds and polymers. It seems
that, these extracts are more effective in the inhibition of oil oxidation
than synthetic antioxidants such as Butylated hydroxyanisole
(BHA) and Butylated hydroxytoluen (BHT)