JPH0716382B2 - Method for producing seaweed minerals - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing seaweed minerals useful as an alternative seasoning for salt, health foods, herbal medicines and the like. In particular, it relates to a method for producing a seaweed mineral having a hypertensive preventive effect.

[Prior Art] Seaweed contains various minerals useful for health, and is widely used as a healthy food.

However, conventionally, few seaweed have been pharmaceutically prepared as a healthy food. Under such circumstances, Japanese Patent Publication No. 57-6899 discloses a method for producing a health food containing minerals in seaweed. In this method, minerals such as Ca, Mg, Fe, and Zn that have not been sufficiently extracted from seaweed in the past are effectively collected and obtained by extracting them under acidic conditions.

However, the health food produced in the above publication has a problem that when it is prepared as mineral water, or when it is pulverized and redissolved, a precipitate is generated and it becomes cloudy and is not suitable for food. Furthermore, the quality of the health foods is that seaweed dried products are 300-550 ° C.
When ashed with ash, it is easy to be affected by the ashing conditions (eg, baking machine used, water content and fat content in dried seaweed to be processed, the amount to be processed, and the processing time), and there is no offensive odor. It has always been difficult to produce good quality products.

[Problems to be Solved by the Invention] Accordingly, an object of the present invention is to inexpensively produce high-quality seaweed minerals that have good solubility, do not become cloudy in water, and have an effect of preventing hypertension.

[Means for Solving the Problems] In order to achieve the above object, use a seaweed ash having a Hunter whiteness of 30 or more, and perform water extraction of each mineral from this ash under pH 5 to 14 conditions. Therefore, they have found that they have an excellent effect, and have completed the present invention.

That is, the present invention, for the seaweed ash having a whiteness hunter of 30 or more, perform water extraction under extraction conditions of pH 5 to 14, and have a hypertensive preventive effect characterized by concentrating or drying this water extract. A method for producing seaweed minerals is provided.

The seaweed species used in the present invention include wakame, arame, root kelp,
Examples include Honda straw, Asco film, hijiki, tsunomata, giraffe and Lessonia. In the present invention, the use part of the seaweed is not particularly limited, and an unused part which has been conventionally discarded can also be used. That is, for example, the sprout portion of Wakame seaweed, the middle part and the upper part of the leaf, the root portion of Arame seaweed, and the temporary root portion of root kelp can be used, which is very economical. As a raw material, these dried products, specifically, those having a water content of about 3 to 15% are preferable.

In the production method of the present invention, first, the dried product of seaweed is calcined and ashed. Firing is performed so that the hunter whiteness of the ash is 30 or more. When the Hunter whiteness is less than 30, the obtained seaweed mineral has an offensive odor, which is not preferable. The firing conditions such that the hunter whiteness is 30 or more, depending on the seaweed dry product weight to be treated, for example 400
It is preferred that the temperature is up to 600 ° C for 2 to 6 hours.

Examples of the baking machine used include an electric furnace, a combustion furnace, and a roasting machine.

Then, the obtained ash is subjected to a water extraction operation. Examples of the extraction solvent include deionized water, distilled water, tap water, acidic water such as organic acids (eg citric acid, succinic acid) and inorganic acids (eg hydrochloric acid). The amount of the extraction solvent is not particularly limited, but for example, 4 to 20 per 1 part of ash.
It is a department. The extraction method may be an ordinary method, and examples thereof include a dipping method. In the case of the dipping method, it may be hot-soaked or cold-soaked, but generally it is preferably carried out at 10 to 40 ° C for 1 to 24 hours. Further, it is preferable to perform stirring and the like during the immersion.

Generally, as the above extraction progresses, the extract gradually becomes more alkaline (because the extracted minerals are generally alkaline). However, in the present invention, the pH of the extract is always 5 to 14, preferably 5 to 5 during the extraction operation.
Set in the range of 8. If the pH is less than 5, Ca, Mg, Fe,
A mineral such as Zn is excessively extracted, and when it is made into mineral water or when it is pulverized and redissolved, a precipitate is generated and it becomes cloudy, which is not preferable. The pH can be adjusted with the above-mentioned organic acid, inorganic acid or the like.

Then, the water extract is separated from the solid matter by a known method such as filtration or centrifugation. The resulting aqueous extract is generally transparent or slightly brown. That is, for example, the absorption value ΔO.D. (measurement wavelength: 500 nm, water as a control) of a water extract obtained by adding 40 ml of distilled water to 10 g of ash and extracting by shaking at 25 ° C. for 1 hour is generally 0.1 or less. is there. Also this extract 100μ
When spotted on a thin layer plate (silica gel 60F-254) and developed with a developing solvent (butanol: acetic acid: water = 4: 1: 5), no spot is seen at Rf values of about 0.4 and 0.7.

Then, the water extract is concentrated or dried. The concentration method may be an ordinary method, for example, vacuum concentration, direct flame evaporation concentration, membrane concentration and the like. The degree of concentration is not particularly limited and may be appropriately selected. Also, the drying method may be an ordinary method, for example, reduced pressure drying, spray drying, thin film vacuum drying, open flame drying, atmospheric pressure drying and the like. The dried product may be appropriately subjected to processing such as crushing.

The seaweed mineral concentrate or dried product of the present invention produced as described above is one that is usually added to foods and drugs as necessary, for example, an excipient, a sweetener, a bulking agent, a flavoring agent, a coloring agent, You may add a corrigent and a quality improving agent.

Furthermore, in order to improve the eating quality, the pH of the above-mentioned seaweed mineral concentrate or the pH of an aqueous solution prepared by dissolving 1 g of the dried seaweed mineral in 100 ml of water is adjusted as necessary to be, for example, 5-8. Preferably. This adjusting step may be performed at any time as long as the obtained seaweed mineral has the above pH, for example, after separating the water extract, or after concentrating or drying. The preparation method is not particularly limited, and acidic substances (for example, hydrochloric acid water, citric acid, malic acid, etc.)
It can be performed by adding and mixing. However, upon addition, it is preferable to select the addition amount and additives so that each mineral composition in the seaweed mineral is maintained as much as possible.

In the seaweed mineral of the present invention obtained as described above, potassium is generally contained in a larger amount than sodium. In order to prevent hypertension more effectively, the ratio Na / K of contained sodium and contained potassium is preferably 2 or less. For this reason, for example, add Na, etc. as needed to increase the Na / K ratio to 2
The adjustment may be made as follows. The timing of adding this salt is not particularly limited, and it may be added at any time.

[Effects of the Invention] In the production method of the present invention, previously unused seaweed and discarded seaweed parts can be used, which is very economical.

Furthermore, the seaweed mineral obtained by the production method of the present invention contains a large amount of medicinal mineral components useful for the prevention of cardiovascular diseases, particularly for preventing hypertension, and is excellent as a crude drug.

Further, the seaweed mineral obtained by the production method of the present invention has almost no bitterness or offensive odor, and does not become cloudy as mineral water, so that it is excellent as a health food or a substitute for salt.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples.

Preparation of Seaweed Minerals (Example 1) Wakame sprouts harvested in Nishitan Town (Awaji Island) were dried in the sun (water content 12%), and 1 kg of this dried product was used in an electric furnace (Yamato Scientific Co., Ltd. DDR). -22) and baked at 500 ° C for 3 hours. Hunter whiteness of the ash at this time was 32.1. 4 parts by weight of distilled water was added to 1 part by weight of this ash, and the mixture was shaken at 25 ° C. for 1 hour and filtered with No. 1 filter paper to obtain an extract. The absorption value ΔO.D. (measurement wavelength: 500 nm, water as a control) of the obtained extract was 0.022. When 100 μl of this extract was spotted on a thin layer plate (Dikagel 60F-254) and developed with a developing solvent (butanol: acetic acid: water = 4: 1: 5), Rf
No spots were seen at values of 0.4 and 0.7. The above extraction operation was repeated on the residue, the obtained extract was combined with the first extract, the pH was adjusted to 7.0 with hydrochloric acid, and the mixture was concentrated under reduced pressure to about 1/10 volume with an evaporator. The concentrated liquid is boiled in an evaporator to precipitate salt, and the salt is further heated at 150 ° C.
The powdery seaweed mineral was obtained by pulverizing with a pulverizer at last.

(Comparative Examples 1 to 4) Each seaweed mineral was obtained in the same manner as in Example 1 except that firing was performed under the firing conditions shown in Table 1. In addition, the Hunter whiteness of each ash, the absorption value ΔO.D. of each extract, and the thin plate (TL
The spot results for Rf 0.4 and 0.7 above C) are also shown in Table-1.

(Seaweed Mineral Odor Test) 3 g of each seaweed mineral of Example 1 and Comparative Examples 1 to 4 was placed on a medicine wrapping paper, and eight panelists sniffed these directly with their noses.
A sensory evaluation of the strength of the offensive odor was made. The results are shown in Table-1. In Table-1, "+++" has a fairly strong odor, and "+"
“+” Means a moderate odor, “+” means a faint odor, and “−” means no odor.

As is clear from Table-1, if the Hunter whiteness of the ash is over 30, the absorbance ΔO.D. of the extract is over 0.1, or if spots are seen on the thin-layer chromatograph plate (Rf value, 0.4,
At 0.7), the seaweed mineral has a strange odor.

(Pharmacological test) The left kidney of SD male rats aged 150 to 200 g and 6 weeks old was isolated under pentobarbital anesthesia. After nephrectomy, deoxycorticosterone (DOCA) suspended in olive oil was added.
The sample was subcutaneously administered once a week in an amount of 30 mg / kg, and the sample containing 1% salt and the sample containing 1% wakame mineral were naturally ingested. Regarding the administration method of DOCA, 1% NaCl-containing sample and 1% wakame mineral-containing sample, DOCA was subcutaneously administered at a rate of 30 mg / kg once a week for 2 months, and 1% NaCl-containing sample and 1% wakame Each of the mineral-containing samples was orally administered daily for 2 months. The blood pressure of the rat before the test, one month after the test, and the second month after the test was measured using the tail-cuff method.
It was measured by. The results are shown in the table below.

A significant increase in blood pressure was observed in the 1% NaCl administration group as compared with the control group. On the other hand, the 1% wakame mineral-administered group showed no significant increase in blood pressure at 1 month compared with the control group, and 1%
In the 1-month group administered with NaCl (blood pressure: 191.8 ± 5.8 mmHg), the blood pressure was reduced by about 10 mmHg by the administration of 1% wakame mineral.

This suggests that seaweed minerals are effective in the prevention and treatment of hypertension.

(Usability as a salt substitute) The test subjects were asked to determine what concentration of salty water of the wakame mineral salt water of Example 1 prepared to each concentration of 1.0%, 1.5% and 2.0% was equivalent to the salt water concentration. A taste test was conducted on 6 people. The results are shown in FIG.

As shown in Fig. 1, the saltiness of each wakame mineral salt water of 1.0%, 1.5%, and 2.0% concentration is about 0.2 to 0.6.
%, About 0.6-1.0, and about 1.0-1.5% concentration of saline. Therefore, the seaweed mineral of the present invention,
It can be used well as a salt substitute and does not have excessive bitterness, astringency, or odor.

[Brief description of drawings]

FIG. 1 shows a correlation diagram regarding salty taste between seaweed mineral salt water of the present invention and salt water.

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Claims (2)

[Claims] 1. A hypertensive preventive effect, characterized in that seaweed ash having a whiteness of hunter of 30 or more is subjected to water extraction under extraction conditions of pH 5 to 14 and the water extract is concentrated or dried. Method for producing seaweed minerals. 2. The method for producing a seaweed mineral further comprises the step of adjusting the pH of the seaweed mineral, and / or Na / K in the seaweed mineral.
The method for producing a seaweed mineral according to claim 1, including a step of adding salt so that the ratio becomes 2 or less.