Abstract:

The optimal extraction process and stability of the pigment extracted from super black glutinous corn were studied． Results showed that the optimum extraction conditions are as follows: taking mixture of 95% ethanol and 0.1 mol/L HCl as extractant, material-solvent ratio 1:10 (g/ml), extraction temperature 60 ℃, time 120 min and times 3. The pigment holds good resistance to light and heat, and sucrose and glucose affect its stability little, but reductant and oxidant wound destroy its stability. Moreover, metallic ions such as K+, Ca2+, Na+, Mg2+ and Cu2+, have no effects on the stability, while Fe3+ has significant effect．

Key words: super black glutinous maize, pigment, extraction, stability