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Method for extracting algin from fresh Sargassum fusiforme

The technology of hijiki and algin is applied in the field of extraction of algin, which can solve the problems of difficulty in passing through a dyeing filter, poor fluidity, and high calcium content in algin, and achieves safe process operation, expanded raw material range, and better bleaching effect. good effect

Active Publication Date: 2012-10-10
青岛聚大洋藻业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the production process of extracting alginate from kelp in the prior art, calcification technology is adopted, and the produced alginate has the disadvantages of high calcium content, poor water solubility, and high insoluble matter, and the calcium content of alginate is an important index. When used as a printing and dyeing auxiliary, if the calcium content is high, it will form a gel, which has poor fluidity, and it is difficult to pass through the dyeing filter after mixing with the dye, and the dyeing effect is poor.

Method used

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  • Method for extracting algin from fresh Sargassum fusiforme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Color fixation and washing

[0072] Add formaldehyde with a concentration of 40% in the color-fixing pool, the amount of formaldehyde added is 20% of the mass of fresh hijiki, and then add tap water three times the mass of fresh hijiki, and then evenly throw fresh hijiki into the color-fixing pool , after fixing the color for 24 hours, wash with water to remove impurities and excess formaldehyde;

[0073] (2) Broken

[0074] Breaking the washed Hijiki;

[0075] (3) Enzymolysis

[0076] Add 1 mol / L citric acid buffer solution to the crushed fresh hijiki to make the pH of the soaking solution 4.8, use 340 u / g of cellulase, enzymolyze at 55°C for 8 hours, and then raise the temperature to 90°C. Keep at temperature for 30min to inactivate the enzyme;

[0077] (4) Conversion

[0078] Control the temperature of the enzymatically hydrolyzed hijiki at 90°C, make up to 7 times hot water, add soda ash in an amount of 7% of the mass of fresh hijiki, digest for 8 hours, an...

Embodiment 2

[0098] (1) Color fixation and washing

[0099] Add formaldehyde with a concentration of 35% in the color-fixing pool, the amount of formaldehyde added is 10% of the mass of fresh hijiki, and then add tap water twice the mass of fresh hijiki, and then evenly throw fresh hijiki into the color-fixing pool , after fixing the color for 20 hours, wash with water to remove impurities and excess formaldehyde;

[0100] (2) Broken

[0101] Breaking the washed Hijiki;

[0102] (3) Enzymolysis

[0103] Add 1 mol / L citric acid buffer solution to the crushed fresh hijiki to make the pH of the soaking solution 4.8, use 230u / g cellulase, enzymatically hydrolyze at 45°C for 6h, and then raise the temperature to 90°C. Keep at temperature for 20min to inactivate the enzyme;

[0104] (4) Conversion

[0105] Control the temperature of the enzymatically hydrolyzed hijiki at 60°C, make up to 4 times hot water, add soda ash in an amount of 4% of the mass of fresh hijiki, digest for 5 hours, and ...

Embodiment 3

[0125] (1) Color fixation and washing

[0126] Add formaldehyde with a concentration of 38% in the color-fixing pool, the amount of formaldehyde added is 15% of the mass of fresh hijiki, and then add tap water twice the mass of fresh hijiki, and then evenly throw fresh hijiki into the color-fixing pool , after fixing the color for 22 hours, wash with water to remove impurities and excess formaldehyde;

[0127] (2) Broken

[0128] Breaking the washed Hijiki;

[0129] (3) Enzymolysis

[0130] Add 1 mol / L citric acid buffer solution to the crushed fresh hijiki to make the pH of the soaking solution 4.8, use 300 u / g of cellulase, enzymolyze it at 50°C for 7 hours, and then raise the temperature to 90°C. Keep at temperature for 25min to inactivate the enzyme;

[0131] (4) Conversion

[0132] Control the temperature of the enzymatically hydrolyzed hijiki between 70°C, make up to 6 times hot water, add soda ash in an amount of 6% of the mass of fresh hijiki, digest for 7 hours, ...

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Abstract

The invention relates to a method for extracting algin from fresh Sargassum fusiforme. The method comprises the following steps of dye fixation, water washing, fragmentation, enzymatic hydrolysis, transformation, coarse filtration, dilution, foaming and floating, fine filtration, acidification bleaching, dehydration, solid phase transformation, granulation, finishing and drying. The method provided by the invention has the advantages that 1, an enzymatic hydrolysis technology is adopted and thus the problem that algin is difficultly extracted from Sargassum fusiforme is solved; and fresh Sargassum fusiforme is used as a raw material for production of low-viscosity and ultralow-viscosity algin and thus a raw material source range of algin processing is widened; 2, an acidification technology replaces the traditional calcification technology and thus the problems of high calcium content, poor water-solubility and high insoluble substance content of the traditional algin are improved; and 3, a NaClO solution is dropwisely added into an extraction system during acidification to realize bleaching and thus the traditional bleaching technology characterized in that chlorine is fed into an algin solution subjected to fine filtration to realize bleaching is modified so that bleaching effects are better and technical processes are safer.

Description

technical field [0001] The invention relates to a method for extracting alginate, in particular to a method for extracting alginate by using fresh hijiki. Background technique [0002] Hijiki belongs to the Phaeaceae Sargassum family. It is a rich economic seaweed resource in my country. The algae are yellowish brown and black when dry. In my country, they are mainly distributed in coastal areas such as Guangdong, Shandong, Fujian, and Zhejiang, and are exported to Japan. other countries. [0003] Alginate is a water-soluble high-viscosity colloid extracted from brown algae such as kelp and hijiki by adding alkali, including water-soluble ammonium, sodium, and potassium salts of alginic acid, and water-insoluble alginic acid and its calcium, Iron and other metal salts with more than two valences. Generally speaking, alginate mainly refers to sodium alginate. In my country, kelp is mainly used as raw material to extract alginate, with an output of about 30,000 tons, most of ...

Claims

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Application Information

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IPC IPC(8): C08B37/04
Inventor 程跃谟吴仕鹏郭华玉纪斌孙梅于云霞
Owner 青岛聚大洋藻业集团有限公司
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