Method for removing arsenic from seaweed extract

A seaweed extract, seaweed technology, applied in food science, application, food preparation, etc.

Active Publication Date: 2012-09-05
BEIJING LEILI MARINE BIOINDUSTRY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increasingly serious pollution of seawater, and seaweed has the characteristics of enriching arsenic and heavy metals, the aqueous solution after extracting pigments and polysaccharides contains quite a lot of arsenic compounds, thus limiting the utilization of the beneficial resources contained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 50 grams of chitosan with a deacetylation degree of 85% are dissolved in 10 liters of 1% formic acid solution to make it a slightly viscous transparent solution. Under rapid stirring, a solution containing 20 grams of carrageenan or fucoidan sulfate is added dropwise to the chitosan solution, the solution becomes turbid and gradually generates granular precipitates, and the pH value of the system is adjusted with sodium hydroxide to 5.0~ 7.0, stand still for more than 4 hours to settle the precipitated particles; pour out the supernatant, centrifuge the precipitate to remove most of the water, dry it in a vacuum drying oven at 60°C until the water content is ≤5%, and crush it to 0.5~1.0mm particle. Add the dry particles of the prepared polymeric polysaccharide to the aqueous solution containing arsenic compounds under stirring, the amount of addition depends on the arsenic content of the solution, add the polymeric polysaccharide particles according to the amount of 100...

Embodiment 2

[0020] 100 grams of chitosan with a deacetylation degree of 90% are dissolved in 10 liters of 5% acetic acid solution to make it a slightly viscous transparent solution. Under rapid stirring, drop the solution containing 30 grams of carrageenan or fucoidan sulfate into the solution of chitosan, the solution becomes turbid and gradually produces granular precipitates, and the pH value of the system is adjusted with sodium hydroxide to 5.0~ 7.0, stand still for more than 4 hours to settle the precipitated particles; pour out the supernatant, centrifuge the precipitate to remove most of the water, dry it in a vacuum drying oven at 60°C until the water content is ≤5%, and crush it to 0.5~1.0mm granules; add the dry granules of the prepared polymeric polysaccharide to the aqueous solution containing arsenic compound under stirring, the amount of addition depends on the arsenic content of the solution, generally, the polymeric polysaccharide granules are added in an amount of 10000 t...

Embodiment 3

[0022] 80 grams of chitosan with a deacetylation degree of 85% are dissolved in 10 liters of 2% citric acid solution to make it a slightly viscous transparent solution. Under rapid stirring, a solution containing 20 grams of carrageenan or fucoidan sulfate is added dropwise to the chitosan solution, the solution becomes turbid and gradually generates granular precipitates, and the pH value of the system is adjusted with sodium hydroxide to 5.0~ 7.0, stand still for more than 4 hours, let the precipitated particles settle down; pour out the supernatant, centrifuge the precipitate to remove most of the water, dry it in a vacuum oven at 60°C until the water content is ≤5%, and crush it to 0.5-1.0mm The granules are set aside; the dry granules of the prepared polymeric polysaccharide are added to the aqueous solution containing arsenic compounds under stirring, and the amount added depends on the arsenic content of the solution. Generally, the polymeric polysaccharide granules are ...

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Abstract

The invention belongs to a method for removing arsenic from seaweed extract. Seaweed contains plenty of substances with nutritional and medicinal value such as polysaccharide, carotene and the like, and aqueous solution after extraction of polysaccharide and carotene still contains mannitol, oligosaccharide with low molecular weight, amino acid, iodine and other minerals which are valuable resources in chemical industry, agriculture and pharmaceutical industry. As seawater pollution becomes more and more serious, while seaweed has the characteristic of enriching arsenic and heavy metal, the aqueous solution after extraction of pigment and polysaccharide contains quite a lot of arsenic compounds, thus limiting the utilization of contained beneficial resources. By utilizing the characteristic that polysaccharide sulfate and chitosan synthesize water-insoluble macromolecules, the method removes the arsenic and heavy metal by adsorbing the arsenic and heavy metal in the aqueous solution.

Description

technical field [0001] The invention relates to a method for removing arsenic in seaweed extract, in particular to a method for removing arsenic in seaweed extract by using sulfated polysaccharide and chitosan polymer. technical background [0002] Seaweed contains many substances with nutritional and medicinal value such as polysaccharides and carotene. After extracting polysaccharides and carotene, the aqueous solution still contains mannitol, low molecular weight oligosaccharides, amino acids, iodine and other minerals , these substances are all valuable resources in chemical industry, agriculture and pharmaceutical industry. Due to the increasing pollution of seawater, and seaweed has the characteristics of enriching arsenic and heavy metals, the aqueous solution after extracting pigments and polysaccharides contains quite a lot of arsenic compounds, thus limiting the utilization of the beneficial resources contained therein. Contents of the invention [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L1/015A23L1/33A23L5/20A23L17/40
Inventor 汤洁
Owner BEIJING LEILI MARINE BIOINDUSTRY INC
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