JP4249073B2 - Oil-based emulsified pigment preparation and its preparation method - Google Patents

Description

  The present invention relates to a method for preparing an oily emulsified pigment preparation. More specifically, the present invention relates to a clear and stable oil-based emulsified dye preparation obtained by emulsifying a water-soluble dye having a viscosity in the range of 5 to 100 Pa · s using a medium stirring mill, and a method for preparing the same.

  Foods are sometimes colored with coloring agents to improve their attractiveness and aesthetics. Food colorants are widely used in foods, and the demand for them is increasing. The coloring matter contained in the colorant has various properties such as a water-soluble one and an oil-soluble one, and is properly used depending on the food to be colored. However, water-soluble pigments used in many foods and pigment preparations using the pigments, when used in foods containing oil, such as margarine, chocolate, and oil parts of dressings, the pigments become insoluble The problem of not being able to keep it stable occurred.

  In order to improve these, when coloring foods containing oil, oil-soluble pigments were used, or water-soluble pigments were emulsified to make them oil-soluble. Specifically, a method in which a stabilizer such as xanthan gum is added to an anthocyanin pigment such as purple corn pigment and homogenized (Patent Document 1), and a method in which a polyol is mixed in an aqueous phase to oil-solubilize the pigment (Patent Document) 2) etc. are disclosed.

  On the other hand, various methods are used to homogenize, that is, emulsify, an aqueous component and an oily component, and colloid mills, agitators, and homogenizers are generally used as mechanical emulsification methods. These emulsification methods are not methods that can be used for all pigments, and for example, pigments with high viscosity (such as caramel) cannot be treated, and the emulsification treatment has been performed after the viscosity has been lowered. Homo dispersers can be processed even with such a high viscosity, but the amount of one batch is limited, which is insufficient for industrial use.

Usually, the following two types can be considered as specific methods for decreasing the viscosity.
(1) Reduce the content of water-soluble components. (Dilute with water)
(2) An emulsifier is dissolved in advance with an oil component.

  With the method (1), emulsification can be performed by all the conventional methods. However, since the resulting preparation has a low concentration, there is an industrial disadvantage.

  Regarding the method (2), although a high concentration emulsified pigment preparation was obtained, it became cloudy and it was difficult to obtain a clear and stable preparation.

JP-A-60-75256 JP-A-7-16075

  The present invention has been developed in view of such circumstances, and has been conventionally difficult to achieve a water-soluble dye having a high viscosity, specifically, a water-soluble dye having a viscosity in the range of 5 to 100 Pa · s. It is possible to prepare a clear oil-based emulsified dye preparation using the above, and to provide a clear and stable oil-based emulsified dye preparation regardless of the procedure of adding and mixing each component.

  The applicant of the present application has conducted extensive research in view of the above-mentioned problems of the prior art, and is an oil-based emulsification using a water-soluble dye in a highly viscous state, specifically a water-soluble dye having a viscosity in the range of 5 to 100 Pa · s. When preparing a pigment preparation, an emulsifier such as a homogenizer or a colloid mill is usually used, but the knowledge that the above problems can be solved at once by emulsifying using a medium stirring mill is obtained. It came to.

  That is, the present invention relates to a clear oil-based emulsified pigment preparation obtained by mixing and dissolving an edible fat and emulsifier, then adding a water-soluble pigment and stirring with a medium stirring mill, and a method for preparing the same.

  According to the present invention, when preparing an oily emulsified dye preparation by emulsifying a water-soluble dye, a water solution having a viscosity in the range of 5 to 100 Pa · s can be obtained simply by replacing the conventionally used emulsifier with a medium stirring mill. It becomes possible to prepare an oil-based emulsified pigment preparation which is clear and free of turbidity using a functional pigment.

  As the water-soluble pigment having a viscosity of 5 to 100 Pa · s used in the present invention, those used for coloring foods can be used without limitation. For example, carotenoid pigments such as gardenia pigment and anato pigment; anthraquinone pigments such as cochineal pigment and lac pigment; red cabbage pigment, purple corn pigment, grape peel pigment, grape juice pigment, strawberry pigment, hibiscus pigment, perilla pigment, hibiscus An anthocyanin pigment such as a pigment, a black bean pigment, and a purple sweet potato pigment; one or two or more of a safflower pigment, a red yeast rice pigment, a cacao pigment, a copper chlorophyll pigment, and a caramel can be used in combination.

  These dyes may be dissolved in water when heated or dissolved in alcohol, and these dyes are usually used in emulsion preparations diluted with water or the like. However, according to the present invention, it is not necessary to dilute with water or the like, and even in a high viscosity state of 5 to 100 Pa · s, it is added to the oil and fat as a medium as it is and emulsified using a medium stirring mill. can do. Alternatively, it may be obtained by preparing a thin solution obtained by dissolving a water-soluble dye in water or alcohol as described above and then concentrating it.

  Oils and fats that can be used in the present invention can be used without limitation as long as they can be used for food applications, for example, those derived from plants such as corn oil, soybean oil, safflower oil; Examples include those derived from animals such as lard oil, and fish oil.

  As an emulsifier to be used, any emulsifier having a surface active effect can be used without limitation. For example, thickeners such as sorbitan fatty acid ester, glycerin fatty acid ester, organic acid monoglyceride, propylene glycol fatty acid ester, diglyceride, sucrose fatty acid ester, polyglycerin fatty acid ester, lecithin, polysorbate, saponin, glycolipid, protein, gum arabic, etc. These may be used alone or in combination of two or more.

The medium stirring mill used in the present invention stirs and mixes a solid with insoluble beads and pulverizes it, and a commercially available one may be used. For example, a super Aspec mill manufactured by Kotobuki Giken Kogyo Co., Ltd., a fine mill manufactured by Mitsubishi Heavy Industries, Ltd. can be exemplified.
The pulverization conditions by the medium agitating mill may be the conditions normally used for pulverization. Specifically, the rotational speed: 2000 to 4000 rpm, the flow rate: 50 to 300 g / min, the medium: alumina beads, zirconia beads, etc. Medium particle diameter: Examples are 0.1 to 1.0 mm, number of treatments: 1 to 7 times.

  The preparation method of the oil-based emulsified pigment preparation according to the present invention only requires the use of a medium agitation mill instead of a commonly used emulsifier (homogenizer or colloid mill), and does not require any special apparatus or process. This is also industrially advantageous.

  Furthermore, in the conventional method for preparing an emulsified preparation, the emulsified preparation often becomes cloudy unless an emulsifier is first added to the aqueous phase and then the oil phase is added and stirred. However, according to the present invention, a clear oil-based emulsified pigment preparation can be obtained regardless of the order of addition of the aqueous phase, the oil phase, and the emulsifier.

  In addition, a fragrance | flavor, antioxidant, vitamins, a stabilizer, etc. can be arbitrarily added to the oil-based emulsion pigment | dye formulation which concerns on this invention in the range which does not impair the effect of this invention.

  Hereinafter, the content of the present invention will be specifically described with reference to the following examples and comparative examples, but the present invention is not limited to these. Unless otherwise specified, “parts” means “parts by weight”.

Example An oil-based emulsified pigment preparation was prepared according to the formulation in Table 1.
<Prescription>

<Preparation method>
An emulsifier was added to the edible oils and stirred, and then caramel color was added, followed by processing using a medium stirring mill (Super Aspec Mill manufactured by Kotobuki Giken Kogyo Co., Ltd.) to obtain an oily emulsified pigment preparation according to the present invention.
≪Processing conditions≫
Mill: Super Aspec Mill Speed: 2000rpm
Flow rate: 100 g / min
Alumina bead particle size: 0.5mm
Processing temperature: 60 ° C

Comparative product In place of the medium stirring mill of Example 1, a colloid mill (NNK colloid mill manufactured by Nippon Seiki Seisakusho Co., Ltd.) was used for processing to obtain an oily emulsified pigment preparation.
≪Processing conditions≫
Rotation speed: 7000rpm
Gap: 8μm

<Result>
The product was not cloudy, and a stable oil-based emulsified pigment preparation which was clear and did not precipitate even when allowed to stand was obtained (see the left side of the photograph in FIG. 1).

In one comparative product, the pigment preparation became turbid, and when left for a while, precipitation occurred (see the right side of the photograph in FIG. 1).

It is the photograph which arranged the implementation product (left side) and the comparison product (right side). The product on the left side was clear enough to read the characters behind the container, but the comparison product on the right side was cloudy and could not read the characters behind the container at all.

Claims (2)

A clear, non-turbid oil-based emulsified dye preparation , obtained by emulsifying a water-soluble dye having a viscosity in the range of 5 to 100 mPa · s using a medium stirring mill. A method for preparing an oil-based emulsified dye preparation, which is obtained by emulsifying a water-soluble dye having a viscosity in the range of 5 to 100 mPa · s using a medium stirring mill.

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