Jp. Rey et al., ISOLATION AND COMPOSITION OF A NATURAL DYE FROM THE STEMS OF SORGHUM-BICOLOR (L) MOENCH SUBSP AMERICANUM-CAUDATUM, Cereal chemistry, 70(6), 1993, pp. 759-760
A simple process has been developed for the isolation of a natural dye
from the stems of Sorghum bicolor (L.) Moench subsp. americanum cauda
tum. The process, with a yield of 20% dry material, can be extrapolate
d to an industrial scale for use in the food and cosmetic industries.
The composition of the dye was elucidated by high-performance liquid c
hromatography, which identified a major anthocyanidin (apigeninidin, 1
7% of the extract) and two main flavonoids (luteolin and apigenin, 9 a
nd 4%, respectively). The absence of the corresponding flavonoid gluco
sides was confirmed.