Anthocyanin colorant from grape pomace

摘要

Grape pomace is contacted with an aqueous extraction solvent containing HSO3 ions to extract anthocyanin-(HSO3) complex. The complex is recovered by treating the liquid extract phase with a non- ionic adsorbent to adsorb the complex. Anthocyanin colorant, free of the HSO3-, ions is recovered by elution with an acidified organic solvent for anthocyanin. The anthocyanin colorant may be provided in dry form by drying the solvent solution.