A kind of preparation method of chlorophyll copper acid and copper sodium salt

Abstract

The invention discloses a method for preparing chlorophyll cuprate and sodium copper chlorophyll. The method comprises the following steps: taking fresh plant stem leaves, adding 90-95% of ethanol, pulping and extracting, and pressing and juicing; roughly filtering the juice by using a gauze of 180-300 meshes, and subsequently carrying out high-speed centrifugation with the speed of 4,000-6,000rpm; adding 5% of a NaOH solution and adjusting the pH value to be 11-12, saponifying, carrying out vacuum concentration and recycling the ethanol; adjusting the pH value to be 2-3, adding 10% of CuSO4 solution for copper substitution; subsequently sequentially washing sediment obtained from suction filtration in warm water for three times and washing the sediment in a low-degree ethanol solution for three times; directly drying the obtained sediment so as to obtain chlorophyll cuprate solid powder; dissolving the washed sediment by using acetone; adding 5% of a NaOH ethanol solution to adjust the pH value to be 10-12, washing the sediment, and drying the sediment after suction filtration so as to obtain sodium copper chlorophyll solid powder. The recycling rate of the method is 0.7-1.0%, and the prepared sodium copper chlorophyll meets various requirements of the GB36406-2011 standard. According to the method, as two time-consumption steps of concentration and saponification are combined together, the time is greatly shortened, the step of organic solvent extraction is eliminated, the process is simplified, and the cost is lowered.

Description

technical field [0001] The invention relates to a preparation process of cupric acid and copper sodium salt, in particular to a preparation process for producing chlorophyll cupric acid and copper sodium salt. Background technique [0002] Chlorophyll is commonly found in plants in nature. It is a green pigment developed earlier and one of the most widely distributed natural pigments on the earth. Chlorophyll is natural, non-toxic and edible, and can be widely used as colorant and deodorant in food and cosmetics. However, free chlorophyll is unstable, and it will change color instantly when it encounters light, oxygen, acid and alkali, etc., and chlorophyll is extremely difficult to dissolve in water, which limits the use of chlorophyll. Therefore, the development and utilization of chlorophyll is mainly to make chlorophyll copper sodium salt for use. [0003] Chlorophyll copper sodium salt is obtained through a series of changes in chlorophyll. The chlorophyll salt is de...

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Problems solved by technology

[0004] The traditional technology has some disadvantages, such as long production cycle, the traditional technology uses organic solvents to repeatedly extract and remove impurities after the saponification step, and it takes a long time for the separation of the two liquids in the extraction to separate into layers, so it takes up equipment and consumes a lot time; the amount of organic reagents is large, the recovery is difficult, and a large amount of organic solvents are used to extract and remove impurities, and the required recovery and storage equipment are many, so the consumption is large and the cost is high; the yield is low, and the chlorophyll itself is easy to decompose. There is also a certain amount of loss in addition to organic solvent extraction, which results in a lower final yield

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