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当前,药剂及食品着色所用的食用色素,以合成食用色素(属偶氮染料类)为主,对人体有累积性毒性。如用天然食用色素代替合成色素,可避免有害物质进入人体,有益于健康。因此,国内外对天然色素都十分关注。Smith和Robert等对紫葡萄皮中红色色素进行了深入研究。德国霍夫曼(Hoff mann)从黑豆皮中提取了红色素用于医药、食品、化妆品等的着色,
At present, the food colorings used for the coloring of pharmaceuticals and foodstuffs are based on synthetic food colorings (azo dyes) and have cumulative toxicity to the human body. If natural pigments are used instead of synthetic pigments, harmful substances can be prevented from entering the human body and benefiting health. Therefore, both domestic and foreign countries are very concerned about natural pigments. Smith and Robert conducted in-depth studies on the red pigment in purple grape skin. Hoffmann extracted red pigment from black bean skin for coloring of medicines, foods, cosmetics, etc.