This article provides a new process for extracting natural curcumin for consumption, using an alkaline extraction method to produce curcumin as an edible pigment. The weight yield of curcumin can be stabilized at over 10%, with a curcumin content of over 40%. The product is a yellow orange powder, which is easy to use, store, and transport. Fully overcome the shortcomings of existing technology.

Preparation of powdered natural edible pigment curcumin by water extraction method. The simple process is as follows: ① The ginger root of the plant is first crushed; ② Extract and separate cellulose, starch, volatile oil and other components using alkaline solution (alkaline solution ratio of 1:5-30, alkaline solution concentration of 0.1-5%, extraction temperature of 30-90 ℃); ③ Precipitation with acid; ④ Filtering; ⑤ Dry.

Advantages and positive effects of this process: ① The curcumin extracted by this invention is a natural pigment. ② The present invention has advanced technology, short process, high product yield, and safe production. ③ The product is a yellow orange powder, which is easy to use, store, and transport. ④ The residue after alkaline extraction in the present invention can be mixed with the waste acid water in acid precipitation. After slightly washing with water, the residue can be used as feed or fertilizer.

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