STORAGE STABILITY AND THERMAL-STABILITY OF HORDEUMIN, AN ANTHOCYANIN PIGMENT FROM BARLEY

Hordeumin stored at -40 to -80 degrees C in 1% HCl-methanol suffered n either from color reduction nor discoloration, After heating at 80 deg rees C for 60 min, hordeumin showed a pigment retention rate of 100%. This characteristic is because the pigment is a composite high-molecul ar weight compound consisting of anthocyanins and polyphenols. It was determined, however, that discoloration and browning occurred more rap idly than color reduction during storage and heating of the pigment.