Extraction of Natural Pigment from Purple Potato in Preparation of Edible Ink

摘要

Natural pigment is safe and non-toxic, and the pigment in purple potatoes is bright in color, which is a good material to produce edible ink. This paper reported a green method of extracting the pigment of purple potatoes and produced edible ink with it. The optimum condition of extracting pigment was obtained by varying ethanol concentrations, feed liquid ratios, extraction times and temperatures. The obtained pigment was characterized by spectrophotometer. The result showed that the edible ink was in good color on paper, biscuits and bread and the light could make it fade in a short time.