Antiradical activity depended on the content of phenolic compounds. Very high correlation (r>0.95) was found between RSA and total phenols, as well as phenylpropanoids, flavonols and anthocyanins (Table 4). Such high correlations were mainly due to high concentration of anthocyanins present in purple roots. This finding was supported by correlation coefficients when purple roots were excluded from calculations. In such case, the correlation between RSA and anthocyanins decreased to a low value (0.32) as there were almost no anthocyanins in orange,red, white and yellow roots. Phenylpropanoids seemed to be the most responsible for antiradical activity (r=0.74) while flavonols showed intermediate correlation.