JPS62107774A - Method for improving color of raw laver - Google Patents

Abstract

PURPOSE:To obtain raw lever sheet having excellent and uniform color tone and excellent taste and flavor, by transferring raw laver in an artificial tank shielded from sunlight, floating the tank in seawater under a specific condition and maintaining under irradiation with ultraviolet radiation and infrared radiation. CONSTITUTION:Raw laver having poor quality and color tone is picked from a laver net during the culture of laver and transferred to an artificial tank shielded from at least a part of sunlight. The artificial tank is floated in sea water, a nutrient source such as sodium nitrate, ammonium sulfate, gluconic acid, etc., is added to seawater while controlling the concentration and temperature of seawater and the laver is maintained under irradiation with infrared radiation and ultraviolet radiation emitted from fluorescent lamp, incandescent lamp or other light source. A high-quality raw laver having excellent and uniform color tone can be produced by this process.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for improving the color tone of raw seaweed, and can be widely used in the seaweed cultivation and processing industry.

(Prior Art and Object of the Invention) Seaweed is a versatile food unique to Japan that is rich in vitamins and minerals, has excellent flavor, and has been frequently used since ancient times.

Nori is produced using seaweed of the genus Porphyra as a raw material, and at present, it is obtained by cultivating raw seaweed in the natural sea. However, as is usual with aquaculture under natural conditions, the growth and quality of raw seaweed are greatly influenced by natural conditions such as the weather, and this is particularly noticeable in its color tone.

Particularly in the seaweed industry, color is an important part of the quality of seaweed, and the price of seaweed varies greatly depending on the quality of the color.

As described above, at present, the color tone of raw seaweed is left solely to the natural environment during cultivation, and there has never been any artificial processing of this to bring out the color of the leaves. Moreover, the current state of the art in this technical field does not even suggest the setting of conditions for this purpose, the timing of artificial treatments, their combinations, or any significant improvement in color tone.

Therefore, the present invention aims to artificially process low-quality seaweed with a low-quality color to bring out the color of the leaves, and to constantly obtain seaweed with a uniform and excellent color. This is a patent that features

(Disclosure of the Invention) In order to achieve the above object, the inventors of the present invention, as a result of intensive research, realized that the intended purpose would not be achieved if left under natural conditions, and came up with the idea of artificial treatment for the first time. It has arrived. After further research and consideration, we transferred the raw algae to an artificial tank mid-cultivation and left it suspended in seawater, which led to the new finding that among the various properties of the raw algae, especially the color tone, was homogenized. Ta.

The present invention is based on this useful and completely new knowledge, and was completed as a result of further detailed study.

In the present invention, first, raw algae of low quality color are picked from the seaweed net during cultivation and processed in an artificial tank, so to speak, for secondary culture or secondary incubation.

In the artificial tank, it is necessary to select conditions and determine optimal values so that the coloring of the proto-algae thallus is carried out efficiently.

To do this, it was first necessary to set various conditions for the seawater, and after repeated tests from various angles, it became clear that it was necessary to control the seawater's salinity and temperature, as well as provide nutrients.

The salinity concentration of seawater has a specific gravity of 18 to 25, preferably 20 to 25.
The seawater temperature should be adjusted to about 23°C, and the seawater temperature should be below 22°C, especially around 17°C.
It is best to keep it below ℃. The lower the seawater temperature, the better and more stable color tone can be obtained, but it takes longer to achieve this.

Nutrients are added to seawater. As nutrients, nitrogen sources, phosphate sources, phosphoric acid, phosphoric acid, vitamins, and minerals are used. Nitrogen sources used include inorganic sources such as sodium nitrate, ammonium sulfate, and ammonium chloride, as well as organic sources such as soybean flour, peptone, meat extract, urea, cornstarch liquor, casein hydrolyzate, and asparagine. . As the phosphate source, ammonium phosphate, calcium phosphate, lime superphosphate, etc. are used. The ratio of NAP can be adjusted as appropriate, but as a rough guide, it is about 2 to 8:1. As the organic acid, gluconic acid, malic acid, citric acid, acetic acid, succinic acid, ascorbic acid, etc. are used. Various vitamins and minerals used for culturing algae and microorganisms are also advantageously used in the present invention. Mixtures of nutrients such as inorganic or concentrated organic fertilizers can also be used.

In the present invention, secondary culture is performed artificially, so the artificial seawater tank should not be installed outdoors, and at least a portion of it should be covered with a roof to prevent sunlight from entering. The sunshine hours are the average sunshine hours in November, December, and January, and infrared and ultraviolet rays are irradiated from fluorescent lights, light bulbs, and other sources accordingly. These infrared and ultraviolet rays are easily absorbed by seawater and cannot reach the bottom of the aquarium, so the seaweed is stirred so that it is evenly exposed to the sea surface. As the stirring device, a conventional propeller-type mechanical stirrer, a pneumatic stirrer using air, or other stirring devices can be used as appropriate.

When these conditions are maintained for about 10 to 100 hours, the seaweed, which was of poor quality and uneven, changes to an extremely excellent color tone, and the color tone remains stable without discoloration. Become something.

Example: Add 5 parts of ammonium sulfate, 1 part of calcium phosphate, a small amount of mineral and vitamin mixture, and a small amount of citric acid to bring the salt concentration to 2.
Sea water adjusted to about 1
It was placed in an indoor artificial tank of 0.012 volume.

Add low-quality colored raw algae picked from seaweed nets to this,
The mechanical Starcy rotated and slowly floated away. The water temperature was maintained at 5° C. for 40 hours while irradiating infrared and ultraviolet rays from the top of this artificial tank.

As a result, high quality raw seaweed with excellent and uniform color tone was harvested. When this was dried in the form of a plate according to a conventional method, a dried seaweed product with excellent aroma and flavor was obtained.

Claims (1)

[Claims] Low-quality colored seaweed algae picked from seaweed nets are suspended in seawater in an artificial tank that blocks at least part of the sun's rays, and is exposed to ultraviolet and infrared rays in the presence of nutrient sources while controlling seawater concentration and water temperature. A method for improving the color tone of raw seaweed, characterized by holding it while irradiating it.