JPS626662A - Method of deodorizing extracted solution of sea tangle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a
．． The present invention relates to a method for deodorizing a kelp extract that effectively removes the fishy smell of the kelp extract.

(Prior art) Kelp contains many components useful for the human body, such as calcium, iron, and trace minerals. moreover.

By separating and purifying the extract components of kelp.

Components with pharmacological effects have been detected. An easy way to take in the useful components of kelp is by drinking kelp extract. Examples of kelp drinks include liquid products obtained by soaking kelp root in water and then extracting its useful components. However, this extract has a fishy smell and is viscous, so it is not suitable as a beverage.

Methods for removing the fishy smell include methods such as odor removal and masking. Odor removal includes ultrafiltration, adsorption removal using activated clay or activated carbon, and denaturation by reaction with odorous substances. Masking includes flavoring such as lemon flavor, seasoning with citric acid, and adjusting acidity. However, no matter which method is used, the fishy smell cannot be completely removed. As disclosed in Japanese Patent Publication No. 55-37225, although the fishy odor can be eliminated by adding ethyl alcohol, it is necessary to add an amount exceeding that of soft drinks. Therefore, it cannot be put to practical use.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and its purpose is to provide a method for deodorizing kelp extract by which odor components can be effectively removed. There is a particular thing.

(Means for Solving the Problems) The method for deodorizing a kelp extract of the present invention involves cooling a kelp extract at a temperature higher than normal temperature to which cyclodextrin has been added.
filtration of the precipitate obtained, thereby achieving the above object.

The kelp extract is obtained by soaking kelp in a suitable solvent such as water or alcohol. All such extracts have a fishy odor. The main component of odor is methyl mercaptan, and many substances such as aldehydes, amines, unsaturated fatty acids, and terpenes are involved. It also contains trimethylamine, which is known for its foul odor. These odor components produce an appetizing aroma when dried.

However, it emits a fishy odor underwater.

Cyclodextrin is effective in removing odor components. Cyclodextrin has 6 to 8 D-glucose α
- It is an oligosaccharide with 1,4 glucosidic bonds. Cyclodextrin is a donut-shaped molecule with a cavity in the center of the cyclic structure. The inside of the ring is hydrophobic and incorporates compounds with lipophilic groups to form clathrates. The inventor of the present invention considered applying such properties of cyclodextrin to include odor components and remove them from the system.

Examples of compounds in the kelp extract that can be included in 2-cyclodextrin include low-molecular organic compounds such as trimethylamine and methyl mercaptan. These are the main components of odorants.

Sulfated polysaccharides such as fucoidan, laminarin, and alginic acid, which are useful ingredients (these are useful for preventing hypertension, arteriosclerosis, etc.), are not included. These are polymeric substances and the size of one molecule is extremely large compared to the cyclic structure of cyclodextrin.

It cannot be taken inside the ring. Minerals such as calcium and iron are also useful metal compounds for the human body.

Hard to be included. Therefore, by allowing cyclodextrin to act on the kelp extract, only the odor components can be effectively removed.

Even when odor components are included in cyclodextrin,
The odor of kelp extract is reduced. but.

If this is heated, there is a risk that the clathrated odor components will be liberated, and for this reason, it is necessary to remove the odor components from the system while they are included in the cyclodextrin. Cyclodextrin removal utilizes the temperature dependence of cyclodextrin solubility.

Odor components of the kelp extract are removed using cyclodextrin, for example, as follows: Cyclodextrin is added to the kelp extract and heated to an appropriate temperature. Cyclodextrin is dissolved in the extract and causes an inclusion reaction with the odor components in the extract. The reaction is completed in a short time. After the reaction, if the reaction solution is cooled, a precipitate is formed. This precipitate is cyclodextrin containing odor components. These are removed by conventional filtration methods. Note that cyclodextrin may be added to the kelp extract that has been heated to a temperature higher than room temperature.

There are three types of cyclodextrins, α-, β-, and T-cyclodextrins, depending on the number of glucose constituents. The cyclodextrin used in the present invention may be any of the above compounds or a mixture thereof. but.

From the temperature dependence of solubility and the crystallinity of the precipitate.

Most preferred is β-cyclodextrin. α and γ−
Cyclodextrin has a smaller temperature change in solubility than β-cyclodextrin. Moreover, the precipitate is starch-like and difficult to filter.

The amount of cyclodextrin added is preferably at least 11 times the amount of O of the evaporation residue of the kelp extract, more preferably at least 0.5 times the amount. If it is less than 0.1 times the amount.

Odor components tend not to be removed effectively.

The temperature during heating is preferably adjusted to 40 to 70°C, more preferably 40 to 60°C. When the temperature drops below 40℃,
Due to the low solubility of cyclodextrin.

Odor components are not removed effectively. When the temperature exceeds 70°C, the once clathrated odor components are liberated again. There is also a risk that useful components in the kelp extract may decompose.

The temperature during cooling is preferably adjusted to 10° C. or lower, more preferably 5° C. or lower, above the freezing temperature of the kelp extract. 1
When the temperature exceeds 0°C, cyclodextrin containing odor components remains in the system in a partially dissolved state. Therefore, odor components cannot be removed effectively.

It is preferable to use a filter aid such as diatomaceous earth for filtering the precipitate.

(Example) The present invention will be described below with reference to examples.

Example 1 100 g of kelp such as honeysuckle was washed with water for 1 minute to remove salt. This kelp (water content 14%) was cut into 5 m/m width pieces and immersed in 1β water at 20 to 25°C for 20 hours.

After rough filtration of the obtained extract, 12 g of diatomaceous earth was added to 600 ml of the filtrate, and the mixture was further filtered through m5A filter paper. The filtrate was used as the stock solution (evaporation residue at 105°C: 4.3%).

1% by weight of β-cyclodextrin was added to 50g of the stock solution. The solution was stirred at 50° C. for 30 minutes to cause an inclusion reaction. After the reaction solution was left at 5°C for 18 hours.

The mixture was filtered through 11h5A filter paper to obtain a deodorized kelp extract.

A deodorized kelp extract was obtained in the same manner as in Example 1 except that 4% by weight of β-cyclodextrin was used.

A deodorized kelp extract was obtained in the same manner as in Example 1, except that 10% by weight of β-cyclodextrin was used.

A kelp extract was obtained in the same manner as in Example 1, except that no β-cyclodextrin was added.

The odor intensity of the kelp extract obtained in the comparative example was given a score of 7, and the odorlessness was given a score of 0, and a sensitivity test was conducted on the kelp extract that had been deodorized in Examples 1 to 3.

The results are shown in the table below.

As is clear from the table, the odor of the kelp extract treated by the deodorizing method of the present invention is significantly reduced compared to the untreated extract. In particular, extracts containing 4% and 10% by weight of β-cyclodextrin both have
It is almost odorless.

Therefore, the deodorizing method of the present invention is effective in removing odors from kelp extract.

(Margins below) 100 g of fresh kelp such as honeysuckle was washed with water for 1 minute to remove salt. This kelp (moisture content 14%) was cut into 5m/m widths and 17! It was immersed in water at 20 to 25°C for 20 hours.

After rough filtration of the obtained extract, 2% diatomaceous earth was added to the filtrate, and the mixture was further filtered through N15A filter paper. This filtrate is 60-8
It was concentrated at 5°C to a residue of 15% after evaporation at 105°C. 2% by weight of CELDEX (powdered cyclodextrin, manufactured by Nihon Shokuhin Kogyo Co., Ltd.) was added to the concentrate. Solution at 50°C
The mixture was stirred for 0 minutes to allow inclusion reaction. After the reaction solution was left at 9° C. for 18 hours, 3% diatomaceous earth was added and filtered through 11h5A filter paper to obtain a deodorized kelp extract.

The odor intensity of the concentrated liquid before adding cyclodextrin was set at 7 points, and an anger test was conducted, and the odor intensity of the kelp extract after deodorization treatment was set at 2 to 3 points.

When 1 ml of a plum meat extract aqueous solution was added to this kelp extract 1001111 and seasoned with sugar and citric acid, a soft drink with no fishy odor of the kelp extract was obtained.

(Effects of the Invention) According to the present invention, the odor components of the kelp extract are effectively deodorized in this way. As a result, the obtained extract is useful as a raw material for soft drinks, for example.

that's all

Claims (1)

[Scope of Claims] 1. A method for deodorizing a kelp extract, which includes cooling a kelp extract at a temperature higher than room temperature to which cyclodextrin has been added and filtering the obtained precipitate. 2. The method for deodorizing a kelp extract according to claim 1, wherein the cyclodextrin is added in an amount of 0.1 times or more the evaporation residue of the kelp extract. 3. The method for deodorizing a kelp extract according to claim 1, wherein the temperature of the kelp extract is 40 to 70°C. 4. The method for deodorizing a kelp extract according to claim 1, wherein the cooling is performed at a temperature of 10° C. or lower.