Abstract
The continuous, countercurrent solvent extraction of anthocyanin pigment from purple-hulled sunflower was investigated with the object of developing a simple, inexpensive process which could be easily scaled to larger capacities. The pigment is believed to have commercial potential as a natural red food colorant. A bench-scale screw-type extractor was developed and evaluated, using distilled water as the solvent and ground hulls from the Neagra de Cluj cultivar of purple-hulled sunflower. The extractor unit allowed for the evaluation of effects of solvent temperature and solvent:hulls ratio on the pigment yield, chemical stability, and dry weight content of pigment in extracts under approximately continuous, steady-state conditions.
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