JPH0662682B2 - Carrageenan production method - Google Patents

Description

The present invention relates to a method for producing high quality carrageenan.

Carrageenan is a sulfated galactan contained in red algae, and is classified into three types, katsupa, iota, and lambda, depending on the content of sulfate radical content or anhydrogalactose unit, and gelation performance, protein reactivity, viscosity, etc. Different basic physical properties. These properties also depend on the counter-cation species attached to the ester sulfate groups. Carrageenan is widely used in a wide range of fields such as the food industry and the cosmetics industry because of its unique variety of properties. Among these applications of carrageenan, for example, in jelly and the like, a carrageenan that is as excellent in solution transparency as possible is desired because of its vivid appearance, good colorability when colored, and refreshing appearance. However, there are few conventional carrageenans that have a transparent solution, which is a problem.

As a method of imparting transparency to carrageenan, a method is known in which carrageenan is obtained by extracting red algae and then performing a precise pass. This method is a method of separating undissolved components by filtration to obtain carrageenan having excellent solution transparency. This method can be expected to greatly improve the transparency of the solution, but it is difficult to achieve excellent transparency, and further improvement in transparency is desired. In addition, when dissolving carrageenan, a method of lowering the solution pH with a mineral acid to improve the transparency is also known. With this method, a carrageenan solution having excellent transparency can be obtained only in the carrageenan produced through the above-mentioned overstep. However, this method has a drawback in that the carrageenan is damaged by the acid and the gel strength of the carrageenan gel is significantly impaired. The present inventors have arrived at the present invention as a result of intensive studies in view of the present situation.

The present invention is a method for producing carrageenan, which comprises extracting carrageenan from red algae, a carrageenan production step until the carrageenan collected from the extract is dried or a dried one, and adding polyphosphate. is there.

According to the method of the present invention, carrageenan having excellent solution transparency can be produced without significantly lowering the pH of the solution and thus without impairing the physical properties of the gel.

There are three known carrageenan production methods: gel press method, drum dry method and alcohol precipitation method. These methods can be considered equivalent until the red algae are extracted and passed, but there are differences in the subsequent concentration, dehydration and drying methods. In the present invention, the polyphosphate salt can be added in any of the steps of extraction, filtration and drying followed by pulverization and mixing in any of the above methods. That is, polyphosphate may be added when extracting red algae in warm water, or may be added to the liquid,
Further, it may be added at the time of crushing and mixing. From the viewpoints of physical properties and uniformity, it is preferable to add in the steps from extraction to drying.

The polyphosphate used in the present invention is a chain polyphosphate having 2 or more phosphorus atoms in one molecule, such as diphosphate, triphosphate, tetraphosphate, etc. Are preferably 3 or more cyclic polymetaphosphates, for example, 3metaphosphate, 4metaphosphate, 5metaphosphate, 6metaphosphate and the like. The polyphosphate salts may be used alone or in combination of two or more kinds.

Polyphosphate is present in the resulting carrageenan at 0.001-50
%, Particularly 0.001 to 10% is preferably added. When polyphosphate is added to the carrageenan extract or its solution and carrageenan is collected by the alcohol precipitation method, a large amount of polyphosphate remains in water, so 0.01 to 1% of the extract or solution is used. It is preferable to add it in the ratio of. When the content of polyphosphate is less than 0.001% with respect to carrageenan, sufficient transparency may not be obtained. In addition, the content of polyphosphate
If it exceeds 50%, the physical properties of carrageenan are not uniform, which is not preferable.

The method of the present invention can be applied to any carrageenan production process of katsupa, iota and lambda. The carrageenan produced by the present invention can be used for manufacturing jelly or the like in the industrial field where carrageenan is conventionally used, for example, in the food industry, and for toothpaste, fragrance, etc. in the cosmetic field.

The carrageenan obtained by the present invention has a feature that it has excellent transparency of the solution while maintaining the physical properties almost equal to those of the conventional product. Especially when the pH of the solution is the same, use hydrochloric acid, etc.
The carrageenan obtained according to the present invention is superior in transparency as compared with the conventional product whose pH is adjusted.

Example 1 Alkali-treated Yukiyu Makotoni 1 from Philippines
After washing 00 g with water, 40 g of diatomaceous earth and the polyphosphate shown in Table 1 were added, and extraction was carried out in 85 ° C. warm water of 4 for 2 hours. The pH of the extract was adjusted to 8.0 to 9.5 with hydrochloric acid or potassium hydroxide, and the mixture was added with isopropyl alcohol in an amount of 4 times the weight of the liquid to precipitate carrageenan and collect it. The precipitate was dried and pulverized to obtain a carrageenan powder. As shown in Table 1, this carrageenan was extremely excellent in the transparency of the solution. The transmittance was expressed as a percentage with respect to distilled water at a wavelength of 660 nm in a visible spectrophotometer as a control. Further, Table 1 shows the results of calculating the polyphosphate contained in carrageenan from the quantitative determination of phosphate ion according to JIS K-0102.

Comparative Example 1 Alkali-treated Yukiyuma Kotoni 1 from Philippines
After washing 00 g with water, 40 g of diatomaceous earth was added, and extraction was performed for 2 hours in 85 ° C. warm water of 4. Hydrochloric acid or potassium hydroxide was added to the extract to adjust it to the pH shown in Table 2, and then 4 times by weight of isopyropyr alcohol was added to the resulting solution to precipitate carrageenan, which was then recovered. did. This precipitate was dried and pulverized to obtain a carrageenan powder. Table 2 shows the pH and transmittance of the 1% solution of carrageenan obtained.

The transmittance was measured by the same method as in Example 1.

Example 2 To the carrageenan powder obtained in Test No. 3 of Comparative Example 1, the polyphosphate shown in Table 3 was added, and then mixed and pulverized. Table 3 shows the pH and the transmittance of the 1% solution of carrageenan obtained.

The transmittance was measured by the same method as in Example 1.

Comparative Example 2 Carrageenan powder was obtained according to Example 1 except that sodium dihydrogen phosphate was added in the amount shown in Table 4 instead of the polyphosphate. The pH and transmittance of the 1% solution of carrageenan obtained are as shown in Table 4, and the transmittance of the solution was not sufficient. The transmittance was measured by the same method as in Example 1.

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-59-113002 (JP, A) JP-A-59-96102 (JP, A) JP-A-58-98046 (JP, A) JP-A-57- 202302 (JP, A)

Claims (3)

[Claims] 1. A method for producing carrageenan which comprises extracting carrageenan from red algae and adding polyphosphate to the carrageenan production process until the carrageenan collected from the extract is dried or to the dried carrageenan. . 2. The polyphosphate is added to carrageenan in an amount of 0.00.
The method according to claim 1, wherein the content is added so as to be 1 to 50%. 3. A polyphosphoric acid salt is a chain polyphosphoric acid having 2 or more phosphorus atoms in one molecule or 3 phosphorus atoms in one molecule.
The method according to claim 1, which is the above cyclic polymetaphosphate.