Analysis of anthocyanins of purple carrots extract
(a) Purification of anthocyanins
The concentrated extract of anthocyanins was purified
according to the method described by Attoe and Van-Elbe
(1981). The concentrate of anthocyanin was purified with 1:1
petroleum ether and ethyl acetate to remove nonpolar impurities.
After phase separation, residual solvent w