JPH07147A - Method for desalting dry powder of algal body belonging to genus dunaliella - Google Patents

Abstract

PURPOSE:To remove salt without destroying a cell in an algal body belonging to the genus Dunaliella due to the salt contained at the high concentration in dried powder of the algae belonging to the genus Dunaliella, living in a salt lake and the ocean and artificially cultured in a culture pond at the high salt concentration. CONSTITUTION:A mixture obtained by mixing 1 pt.wt. dried powder of an algal body belonging to the genus Dunaliella with 3-6 pts.wt. water is placed in a 0.25-0.5% chitosan solution and the resultant mixture is then stirred and allowed to stand. The obtained upper layer liquid is subsequently removed and the residual substance is further dried.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a desalination method for dry powder of salt-tolerant unicellular green alga, Donaliella algae, which lives in an ocean, a salt lake, or is cultured in an artificial culture pond containing a high concentration of salt.

[0002]

2. Description of the Prior Art Donalella algal cells that live in oceans and salt lakes and are cultivated in high-salt culture ponds do not need to be washed because salt removal by washing leads to destruction of thin cell membranes. Since dried Danaellaella algal cells dry powder contains a high concentration of salt, it causes a problem when it is used in foods and pharmaceuticals. Membrane separation methods are used for salt.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The present inventor has found that in a desalination method of a high-salinity dry powder of an algal body of Donariella, the desalination method using a membrane is too costly. The present invention has been achieved as a result of research on desalination from dried algal powder.

[0004]

The present invention is 0.25-0.25.
A mixture obtained by adding 2 to 5 parts by weight of a 0.5% chitosan solution to 3 to 6 parts by weight of water with respect to 1 part by weight of dry powder of a Donariella algal cells, and stirring the mixture at 600 to 1000 rpm. After that, gently stir at 200 to 500 rpm, and then let stand to let the dry powder of Dnaeella algal bodies settle,
After transferring salt to the chitosan solution, the Donariella algal body precipitate aggregate obtained by fractionally removing the upper layer chitosan solution is subjected to centrifugal separation treatment and dried to desalinate the dried powder of Donariella algal bodies. Is.

In the present invention, 3 to 6 parts by weight of water is added to 1 part by weight of the dry powder of the algal cells of Donariella to form a mixture, which is a mixture of 2 to 0.25 to 0.5% chitosan solution. When it is mixed with 5 parts by weight, if it is less than 3 parts by weight, the dispersibility in the chitosan solution is poor and the aggregate becomes large. Because there is no.

[0006] The concentration of the chitosan solution in which the above-mentioned admixture is mixed is set to 0.25 to 0.5%, because the suspended Donariella algal powder is less than 0.25%, agglomeration occurs. If it exceeds 0.5%, the viscosity becomes high, the salt is difficult to dissolve in the solution, and the removal rate decreases, and the amount used is 2 to 5 parts by weight. So, the centrifugation of the Donalella algal powder was not good, so
This is because the recovery rate of carotene is poor, and if it exceeds 5%, the liquid amount becomes too large and it is not economical. In addition, the chitosan solution is acetic acid, formic acid, hydrochloric acid, etc. corresponding to 1% of the total amount,
It means a solution in which chitosan is dissolved. A solution of chitosan dissolved in acetic acid is preferred.

When the above-mentioned admixture (suspension) is mixed with the chitosan solution, it is necessary to stir the mixture at 600 to 1000 rpm while slowly stirring it at 200 to 500 rpm, and then to leave the aggregate at an appropriate size. This is because the salt is dissolved in the chitosan solution in combination with the standing after stirring.

There is an appropriate drying method for drying the centrifugally separated filter cake (cake-like Donariella algae), but freeze-drying is preferred.

[0009]

[Example] Dry powder of Donaliella algae (salt content 40%)
5 parts by weight of water was added to 1 part by weight, and the mixture was kneaded to obtain a dry powder of Donariella algal cells, and 3 parts by weight of a 0.5% chitosan solution was gradually mixed with stirring at 800 rpm. After the addition, the stirring speed was reduced to 300 rpm and the mixture was stirred, then allowed to stand to precipitate the Donaliella algal cells, and the upper layer liquid was removed to obtain a precipitate of 1000 rpm.
The cake of Donaliella algal cells obtained by centrifugation at 1. was lyophilized and pulverized to obtain desalted Donaliella algal cells dried product.

[0010] The salt of the obtained Donaliella algal cells was greatly reduced, and desalted Donaliella algal cells dried powder which can be used for processed foods and the like were obtained.

[0011]

INDUSTRIAL APPLICABILITY According to the present invention, desalted Donariella algal cells which can be easily desalted from a dry powder of Donariella algal cells containing a high concentration of salt and also have a good β-carotene recovery rate Thus, a desalination method of the dry powder of the raw material Donaliella algal cells, which can obtain the dry powder at low cost, was obtained.

Claims (1)

[Claims] 1. A mixture obtained by adding 3 to 6 parts by weight of water to 1 part by weight of the dried powder of an algal body of Donariella, 0.25
After gradually adding to 2 to 5 parts by weight of a 0.5% chitosan solution with stirring, gently agitating and then leaving it to precipitate the Donaliella algal cell aggregates, and then separate the upper layer liquid A method for desalting a dried powder of an algal body of Donariella, which comprises removing the resulting aggregate of the algal body of the Donaliella by centrifugation and drying.