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Industrial production method for extracting natural purple sweet potato coloring matter for food from edible purple sweet potato

A purple sweet potato pigment, purple sweet potato technology, applied in the directions of natural dyes, chemical instruments and methods, azo dyes, etc., can solve the problems of large-scale industrial production methods without a system, the production methods are available, etc., and achieve a simple and reasonable production process and environmental protection. The effect of low pollution and high yield

Active Publication Date: 2011-02-02
衢州正锐农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are reports on the production method of purple sweet potato pigment with high safety, it is mainly based on the laboratory, and there is no systematic scale industrial production method at present.
For this reason, many scientific research institutes, manufacturers and people of insight have carried out research and development for large-scale production, but no reasonable production method has come out yet.

Method used

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  • Industrial production method for extracting natural purple sweet potato coloring matter for food from edible purple sweet potato

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1.0 tons of purple sweet potatoes are cleaned by a potato washing machine, and the purple sweet potatoes are cut into 3-5mm filaments with a shredding machine. Add 2.0 tons of aqueous solution, add 7 kg of food-grade hydrochloric acid, adjust the pH of the solution to 2.3, heat to 30 ° C, and stir for 3.5 hours to extract. After filtration, 1.8 tons of extracts were obtained, which were pumped into a sedimentation tank for static precipitation.

[0030] After 24 hours of static precipitation, the precipitated extract was released from the side port of the precipitation tank, filtered through a 0.45um membrane and pumped into a macroporous adsorption resin column for pigment adsorption at a flow rate of 350L / h, and the adsorption temperature was controlled at 25°C. After the adsorption is completed, use 2 times the volume of the resin to wash the resin, then add 2 times the volume of the resin column for ethanol analysis, the content is 50%, and obtain 0.5 tons of analys...

Embodiment 2

[0034] 1.0 tons of purple sweet potatoes are cleaned by a potato washing machine, and the purple sweet potatoes are cut into 3-5mm filaments with a shredding machine. Add 2.5 tons of aqueous solution, add 6 kg of food-grade hydrochloric acid, adjust the pH of the solution to 2.6, heat at 35° C., and stir for extraction for 4 hours. After filtration, 2.2 tons of extracts were obtained, which were pumped into a sedimentation tank for static precipitation.

[0035] After static precipitation for 24 hours, the precipitated extract was released from the side port of the precipitation tank, filtered through a 0.45um membrane and then pumped into a macroporous adsorption resin column for pigment adsorption at a flow rate of 350L / h, and the adsorption temperature was controlled at 30°C. After the adsorption is completed, use 2 times the resin volume to wash the resin, then add 2 times the resin column volume for ethanol analysis, the content is 60%, and obtain 0.8 tons of analysis sol...

Embodiment 3

[0039] 1.0 tons of purple sweet potatoes are cleaned by a potato washing machine, and the purple sweet potatoes are cut into 3-5mm filaments with a shredding machine. Add 3.0 tons of aqueous solution, add 5 kg of food-grade hydrochloric acid, adjust the pH of the solution to 2.8, heat at 40°C, and stir for extraction for 5 hours. After filtration, 2.7 tons of extracts were obtained, which were pumped into a sedimentation tank for static precipitation.

[0040] After static precipitation for 24 hours, the precipitated extract was released from the side port of the precipitation tank, filtered through a 0.45um membrane and pumped into a macroporous adsorption resin column for pigment adsorption at a flow rate of 350L / h, and the adsorption temperature was controlled at 35°C. After the adsorption is completed, use 2 times the resin volume to wash the resin, then add 2 times the resin column volume for ethanol analysis, the content is 70%, and obtain 0.5 tons of analysis solution, ...

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Abstract

The invention discloses an industrial production method for extracting a natural purple sweet potato coloring matter for food from edible purple sweet potato. The method comprises the following steps of: (1) pre-treating the purple sweet potato, namely cleaning and crushing the purple sweet potato; (2) extracting the purple sweet potato coloring matter, namely extracting the coloring matter in acidic aqueous solution with stirring and settling and separating the extract; (3) performing adsorption refining of the purple sweet potato coloring matter, namely filtering the extract and squeezing the filtered extract into a macroporous adsorptive resin column to adsorb the coloring matter, and leaching the resin with water; (4) concentrating and purifying the purple sweet potato coloring matter, namely adding ethanol into the leached resin column for analysis, concentrating the obtained analytical liquid under vacuum, adding de-ionized water into concentrate to adjust the concentration, andperforming ultrafilteration and removing impurities; and (5) performing spray drying to obtain the powdery purple sweet potato coloring matter. By using the method, the yield of the purple sweet potato coloring matter is high, peculiar smell is not generated, colourity recovery rate is over 90 percent and three wastes (waste water, waste gas and industrial residues) are not generated.

Description

technical field [0001] The invention relates to a production method for extracting natural pigments, in particular to an industrial production method for extracting natural purple sweet potato pigments for food using edible purple sweet potatoes as raw materials. Background technique [0002] Since the British invented the first synthetic pigment, phenviolin, in 1856, it has been widely used in food processing and cosmetics production due to its bright color, strong tinting strength and high stability. In-depth research has found that many synthetic pigments are harmful to the human body, their safety has been questioned, and it has been confirmed that some synthetic pigments have potential teratogenic, carcinogenic and other toxic side effects. Therefore, since the United States banned the use of synthetic pigment amaranth in 1976, international attention has been paid to the development and application of natural pigments. [0003] Edible natural colorants (natural pigmen...

Claims

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Application Information

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IPC IPC(8): C09B61/00C09B67/54C09B67/10
Inventor 徐晖郭入安朱劲柏
Owner 衢州正锐农业科技有限公司
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