カラメル色素中の結合性イミダゾール化合物の遊離

概要

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Caramel color prepared by ammonium-sulfite process contains some imidazoles including toxic 4-methylimidazole. The imidazoles are combined both with acidic low-molecular-weight substances and high-molecular-weight coloring matters. On ultrafiltration of the caramel color solution, the imidazoles bound with low-molecular-weight sub-stances can permeate through the membrane but ones bound with high-molecular-weight coloring matters are retained in the concentrate. The latter bound imidazoles were completely released from the coloring matters when sulfuric acid or sodium hydroxide was added to 10% diafiltered caramel color solution until its concentration reached 0.1 N. The lowest concentration of sulfuric acid required for the complete release of the bound imidazoles was 0.55 N and 0.025 N for 10% original and diafiltered caramel color solution, respectively. It is possible that caramel color freed from the toxic imidazole may be prepared by a combination of sulfuric acid addition with ultrafiltration.
社団法人日本農芸化学会の論文