JPH0697973B2 - Water-oil type emulsion coloring liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industry Belonging to) The present invention relates to a colorant liquid and an emulsion.

The object of the present invention is for coloring foods, pharmaceuticals, quasi drugs, cosmetics and the like, and the dye belongs to water-insoluble oil-insoluble dyes.

(Prior Art and Its Deficiencies) Water-insoluble oil-insoluble dyes have a general drawback that their original hue changes as the pH changes. For example, the anthocyan-based pigment is a well-known pigment for coloring foods such as chamomile, beverages and other pharmaceuticals such as tablets and powders in a red or magenta color, but these have the following drawbacks. Regarding applicable foods and other pH, the higher the acidity, that is, the smaller the number, the lighter the red color and the more red color. On the alkaline side, the pH becomes greener as the alkalinity becomes larger, that is, as the number becomes larger, and further, it becomes blue at neutral.

Therefore, in order to use the water-insoluble oil-insoluble pigment and to color the original hue of the pigment (neutral to weakly acidic standard),
It is necessary to adjust the pH of the food or the like to which it is applied to a neutral to weakly acidic side, or to insulate the dye itself from the pH.

In order to meet the former requirement, it is often necessary to apply the colorant to foods and the like whose properties have been changed, so that it is difficult to meet industrial requirements. Therefore, in order to meet industrial requirements,
The latter method must be used. The present invention belongs to the latter field.

Many attempts are known to meet such demands. For example, JP-A-60-41453, 59-62340, and
60-203139 and others are known. However, even by these methods, it is difficult to industrially advantageously color the original color of the dye.

(Structure of the Invention) The present invention does not have the above-mentioned drawbacks and can be colored industrially advantageously and stably to the original color of the dye. The present invention will be described in detail below.

The dyes used in the present invention are generally water-insoluble oil-insoluble dyes, and examples of such dyes include anthocyan-based, chalcone-based, flavone-based, anthraquinone-based and other dyes. Further, the origin of the pigment may be of any origin, and may be of natural type. For example, the anthocyan pigment is an anthocyan pigment collected from purple corn, purple cabbage, purple grape skin, purple perilla, purple onion, berry fruit, etc.
7.5P to 2.5R, the center of which is a hue of 5RP) and other dyes.

The object of the present invention is an emulsified colorant (W) in which oil (O) is used as a medium, a large number of water droplets (W) are emulsified and dispersed, and the water-insoluble oil-insoluble dye is dissolved and held inside the emulsified and dispersed water droplets. -O type).

The method for producing the target product is as follows.

The oil used is limited to a specific oil. In particular, it must not be a fatty oil, but a so-called citrus essential oil extracted from the skin of citrus fruits.

The above-mentioned aqueous dye solution is added to citrus essential oil, a surfactant is added thereto, and the mixture is stirred to form an emulsion system. The amount of this essential oil used is
An amount of about 20% (same as below or less) of the target product is sufficient. At this time, as the surfactant to be used, a general surfactant used in the production of this type of emulsion is used. Examples of such substances include glycerin fatty acid ester, sucrose fatty acid ester and the like. The fatty acid may have any number of carbon atoms, but in many cases it has about 18 or less, for example, stearic acid, oleic acid, palmitic acid, ricinoleic acid,
Examples thereof include linoleic acid, linoleic acid and others.
And the amount used may be 50% or less with respect to oil. They are,
They may be used alone or in combination of two or more. The mode of stirring follows a conventional method.

What was obtained in this manner is the object of the present invention.

A water-oil-water type emulsion coloring liquid can be obtained from the obtained product. For this purpose, the obtained emulsion is emulsified and dispersed in water. And in order to do that, the water collected earlier-
It is necessary to emulsify and disperse the oil emulsion coloring liquid in water.
Specifically, an emulsifier is added to the mixed system consisting of the emulsion coloring liquid and water. Emulsifiers that can be used include
There is no particular limitation as long as it is employed in the production of this type of emulsion, but in many cases vegetable gums (eg gum arabic, guar gum, etc.), fatty acid esters (eg sucrose fatty acid ester) , Polyoxyethylene sorbitan fatty acid esters and others), starches (eg waxy starch, processed corn starch and others),
Proteins (for example, casein, soybean protein, etc.) may be used alone or in combination of two or more. The amount of this substance used may be 50% or less with respect to the aqueous phase. The system is emulsified. For that purpose, stirring, shaking, or any other method is adopted.

Explaining some of the actions and effects of the present invention, the target product surely develops a desired purple or magenta color in the entire acidic region. This will be described in detail by the following experimental example.

(Experimental example) 20 g of 50% phytic acid water was added to 80 g of red cabbage dye solution (10% E = 400) and mixed. Separately, 5 g of glycerin fatty acid ester was added to 95 g of orange terpene and stirred to homogenize it. The above dye solution was added and stirred to obtain a water-oil type emulsion. Next, this emulsion was added to 800 g of a 25% aqueous solution of gum arabic and mixed uniformly to obtain the desired product (the present invention described below).

In order to see the effect of this thing, red cabbage dye solution (10%
E = 400) 20 g of 50% phytic acid water and 900 g of water were added to 80 g of the mixture and the mixture was uniformly mixed to prepare Control 1. Furthermore, the orange terpene of the above-mentioned experimental example (the present invention) was replaced with soybean hydrogenated oil, and the control example 2 was prepared in the same manner as the above-described experimental example of the present invention. At this time, the system (because it is hardened oil) was prepared by heating (60 ° C).

The effect was shown by adding 0.2% of these samples to buffer solutions of pH 2.2, 3.6 and 7.0, respectively, and allowing them to stand at room temperature for 1 day, and then measuring their hues. Color difference meter (ND from Nippon Denshoku
-504AA type) is used to obtain the Hunter chromaticity (L, a, b),
The result was converted into the hue (HUE) of the pseudo Munsell color system.

The results were as follows.

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

(Example-1) 50% citric acid water in 40 g of red cabbage dye solution (10% E = 400)
10 g was added and mixed. Add this mixture to orange terpene oil 9
7g and glycerin fatty acid ester 3g were added to the homogeneously mixed oil phase, and after stirring, the homogenizer emulsifier (manton
An emulsion was obtained using Gorin Co., Ltd. (US, product) (pressure 120 kg / cm ² ). 850g of 25% solution of gum arabic
And homogenized with a homomixer (4000 rpm) to obtain the intended emulsion colored liquid.

An acid sugar solution having a pH of 3 (0.2% citric acid + 12% sucrose) was colored with this coloring liquid to give a purple-red color (the hue was 2.3R when measured using the color difference meter used in the above experimental example). It was able to be colored.

(Example 2) 1 g of 50% phytic acid water was added to 49 g of purple corn pigment liquid (10% E = 100) and stirred. Pour the obtained liquid into a uniform oil phase consisting of 75 g of lemon terpene oil, 15 g of sucrose fatty acid ester (HLB = 2) and 10 g of glycerin fatty acid ester (HLB = 4), stir it with a homomixer (8000 rpm) to homogenize. To obtain an emulsion.

The obtained emulsion is sucrose fatty acid ester (HLB-15) 20
g, 830g of water added to a homogenous system, homomixer (4000rpm)
To homogenize to obtain the intended emulsion colored liquid.

When the acid sugar solution of pH 3 was colored using this coloring solution, it was possible to color purple red (the hue was 5.6R when measured using the color difference meter used in the above experimental examples).

Claims (2)

[Claims] 1. A water-oil type emulsion coloring liquid comprising an essential oil extracted from the skin of a citrus fruit as an oil phase and an aqueous solution of a water-insoluble oil-insoluble dye as an aqueous phase. 2. A water characterized in that water and an emulsifier are added to a water-oil type emulsified coloring liquid in which an essential oil extracted from citrus fruit skin is used as an oil phase and a water-soluble oil-insoluble pigment aqueous solution is used as an aqueous phase. -A method for producing an oil-water type emulsion coloring liquid.