JPH1175591A - Quality improver of laver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject quality improver capable of improving the quality of laver, and further improving the growth of the laver by using a chitosan as an active ingredient. SOLUTION: This quality improver consists essentially of a chitosan. The chitosan is obtained by chemically treating crusts of a lobster, a crab or the like to provide a chitin, and deacetylating the chitin. Preferably, the chitosan having 40-60% deacetylation degree is used because the solubility in sea water is increased, and the chitosan is safely used because the dipping and scattering treatment is carried out at the pH of the sea water. The method for treating the laver is the one by the dipping treatment of the laver into a chitosan solution having >=0.003% chitosan concentration. The quality improving effect is extremely heightened by the repeating treatment from a time of a small sprout in a raising of seedling period to the first and second plucking times. The chitosan with added one or more kinds of a nitric manure, a phosphate manure, a saccharide, a vitamin or the like is preferable because the effect is more heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laver quality improving agent for improving laver quality by dipping or spraying a laver culture net in a laver culture process.

[0002]

2. Description of the Related Art In seaweed cultivation, a method of immersion in an acidic liquid (pH 1.5 to 2.5) has been adopted in order to control algae (Aonori) and bacteria such as red rot. . As an acid to be used, citric acid is mainly used. After seeding, before seaweed can be plucked,
Since the growth of Aonori is faster than that of Nori, Aonori is mixed and becomes longer than Nori, which hinders the growth of Nori.
Therefore, the acid treatment is performed before the plucking starts to control the blue-green algae.

Another purpose of the acid treatment is to control red rot. Red rot is said to be a parasite of the genus Picium or related water mold, and grows mainly at a water temperature of about 15 ° C. Nori cultivation is carried out at a water temperature of 22 to 8 ° C., and extermination by acid treatment is performed at a time when red rot of about 15 ° C. occurs. During the period from late December to March, when seaweed is produced in large quantities, the water temperature is 8 to 10 ° C. Even if red rot occurs, the progress is slow and there is little need for acid treatment.

[0004] As described above, the acid treatment is a means for eliminating mixed Aonori and preventing rot due to disease.
It does not have the effect of improving the quality of the laver itself (blackening, improving gloss, softening, improving taste, improving elongation). In recent aquaculture, it has been an issue how to produce a high-quality product with a high yield from one laver culture net. A typical production quantity is 1
Since 1.5 million to 6 million pieces are produced per management entity,
If we can produce high quality seaweed for 1 yen per piece,
The production value will increase by 1.5 to 6 million yen. Since the unit price of laver becomes particularly high as the color becomes darker, there is an urgent need for the development of a treatment agent that makes the color black.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a treating agent which improves the quality of laver and promotes elongation.

[0006]

Means for Solving the Problems In order to solve the above problems, as a result of diligent research, it has been found that, by immersing or spraying with a treatment agent containing chitosan as a main component, the growth of laver is improved and high quality is obtained. Has been found to be able to produce nori.

That is, the present invention is as follows. (1) Nori quality improving agent containing chitosan as a main component. (2) A quality improving agent characterized in that the degree of deacetylation of chitosan is 40 to 60%. (3) 1 such as nitrogenous fertilizer, phosphate fertilizer, sugar, vitamin
The quality improving agent for laver according to claim 1 or 2, wherein at least one species is added.

The laver quality improving agent of the present invention has an effect of increasing blackness and gloss and promoting growth of laver.
As can be seen from the test results, by performing the immersion treatment with the chitosan solution, the yield was increased, and the amount of free amino acid as the umami component was also increased. That is, it shows that the effect of promoting elongation and the taste are improved. Regarding the blackness, the control was slightly reddish, whereas the one treated with chitosan of the example had an increased blackness. The effect was found to be even higher when treated with fertilizer components.

The treatment method of the present invention may be either immersion or spraying, but immersion treatment provides a more stable effect. If the treatment is repeated from the small buds during the seedling raising period to the first and second plucking, the quality improving effect is extremely high.

[0010] The chitosan used in the present invention is produced by deacetylating chitin obtained by chemically treating the shell of shrimp and crab, etc., and has a cohesive and antibacterial quality. Are materials being studied in each field. Chitosan is a basic polysaccharide having glucosamine as a constituent sugar. Since chitosan is hard to dissolve in water, it is used by adding a small amount of an organic acid (slightly acidic). As the acid to be used, organic acids such as lactic acid and acetic acid are desirable. In particular, when chitosan whose degree of deacetylation is adjusted to 40 to 60% is used, the solubility in seawater is increased and it can be easily dissolved. Even though nori sprout is not damaged, it can be used safely. In addition, mixing with fertilizer components is good, and formulation is easy.

The concentration of chitosan when used is not particularly limited, but is preferably 0.003% or more.
The longer the immersion time, the more effective. Nitrogenous fertilizers, which are fertilizer components, are sodium nitrate, potassium nitrate, ammonium nitrate, urea, ammonium chloride, amino acids, peptides,
Phosphate fertilizers such as proteins include phosphoric acid, sodium phosphate, potassium phosphate, ammonium phosphate, phytic acid, and the like.

(Test 1) Every three days after seeding, a dipping treatment was performed for 10 minutes using the treatment agent shown in Table 1, and after the eighth treatment, the first seaweed was collected (28 days after seeding). Eye).
Thereafter, the treatment was performed for each plucking. With respect to the first and third harvested laver, the laver yield and laver quality (blackness / umami) were investigated. As for the taste, the amount of free amino acids in the dried seaweed was analyzed to evaluate the taste. Controls are untreated. The results are shown in Table 2.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

EFFECTS OF THE INVENTION By treating a nori cultivation net with a treating agent containing chitosan as a main component, the growth of nori can be promoted and the blackness, gloss and umami can be increased. It can be produced in high yield.

Claims (3)

[Claims] 1. A laver quality improving agent comprising chitosan as a main component. 2. The degree of deacetylation of chitosan is 40-60.
%. 3. The seaweed quality improving agent according to claim 1, wherein one or more of nitrogenous fertilizer, phosphate fertilizer, sugar, vitamin and the like are added.