JP2000026503A - Non-volatile organic solvent-containing xanthan gum and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain xanthan gum having high viscosity characteristic, excellent resistance to salt when made into an aqueous solution and uniform dispersibility into water and useful as a thickener in a food filed, a cosmetic field and an agrochemical field, etc., a stabilizer or an additive. SOLUTION: The objective xanthan gum is obtained by heating xanthan gum containing >=0.01 wt.% of non-volatile organic solvent preferably having >=120 deg.C boiling point and <=90 deg.C melting point and preferably as a solvent (e.g. 1,3-butylene glycol) having more than one kind of substituting group selected from an ester group, hydroxy group and carboxy group at >=80 deg.C, preferably 120-150 deg.C for 15 min-4 hrs. Preferably, the heating treatment is performed after spraying the non-volatile organic solvent to the xanthan gum in the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a xanthan gum containing a nonvolatile organic solvent and a method for producing the same. Such a modified xanthan gum is used as a thickener, a stabilizer, and an additive in the food field, cosmetics field, agrochemical field, pharmaceutical field, or petroleum field.

[0002]

2. Description of the Related Art Xanthan gum is obtained from the microorganism Xanthomonas campestris.
estris) is a kind of microbial polysaccharide produced from carbohydrates such as starch, glucose, and sucrose. The structure of xanthan gum mainly consists of D-glucose and D-glucose.
It consists of the sodium, potassium and calcium salts of mannose and D-glucuronic acid, and the main chain consists of the β-1,4 linkage of D-glucose. As a method for producing xanthan gum, a method is known in which after a fermentation step, heat treatment is performed to sterilize microorganisms, the alcohol is removed, and drying and pulverization are performed. It is known that xanthan gum is stable against salts, and that addition of salts increases the viscosity of an aqueous solution. Japanese Patent Application Laid-Open No. 10-33125 discloses a method of drying xanthan gum powder by heating in order to improve the viscosity of xanthan gum.

[0003]

However, it has been found that in the conventional heat drying method, although the viscosity of the aqueous xanthan gum solution increases, the salt resistance deteriorates, such as precipitation due to salt addition. In addition, the dispersibility in water is difficult to "makoko" and looks good, but becomes microscopically non-uniform. For this reason, the xanthan gum obtained by the heat drying method has a problem in that locally high and low density parts are formed as compared with the non-heat-dried product, the viscosity becomes uneven, and furthermore, it becomes cloudy.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve such a problem. As a result, the salt resistance and uniform dispersion of xanthan gum have been improved by mixing xanthan gum and a nonvolatile organic solvent. By heating, they found that they had excellent salt resistance and uniform water dispersion, and completed the present invention. That is, the present invention relates to a xanthan gum containing a non-volatile organic solvent, which is obtained by heat-treating mixed particles of xanthan gum and a non-volatile organic solvent, and a method for producing the same. The xanthan gum containing a nonvolatile organic solvent of the present invention has a xanthan gum concentration of 0.5% by weight.
2000 to 30000 mPa · s
(B-type viscometer, 6 rpm, 25 ° C.), but salt resistance and water uniform dispersibility, which are difficult to quantify, are also improved by the present invention. The nonvolatile organic solvent-containing xanthan gum of the present invention,
Generally, xanthan gum and 0.1% for xanthan gum.
More than 8% by weight of a non-volatile organic solvent
It can be obtained by heating at 0 ° C. or higher. The heating can be performed in a nonvolatile organic solvent, in a nonvolatile organic solvent-containing organic solvent, or by adding a nonvolatile organic solvent to xanthan gum. Although it is more effective to perform the treatment at a high temperature, it is easy to color, and particularly when subjected to the presence of oxygen such as in air, the coloring may occur. Therefore, the heat treatment is preferably performed in an inert gas.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. As described above, the non-volatile organic solvent-containing xanthan gum of the present invention can be generally obtained by mixing xanthan gum and a non-volatile organic solvent in an amount of 0.01% by weight or more with respect to xanthan gum, and further heating the mixture at 80 ° C. or more. it can. As the raw material xanthan gum used for producing the xanthan gum containing a nonvolatile organic solvent of the present invention, first, commercially available powdery or granular xanthan gum can be used. As such a raw material xanthan gum, in a method for producing xanthan gum that is separated from a culture obtained by liquid culturing Xanthomonas campestris with a lower alkanol using corn starch, glucose or the like as a carbon source, concentrated xanthan gum after fractional precipitation, Xanthan gum during the drying step can be used.

As the non-volatile organic solvent as a raw material, an organic solvent having a boiling point of 100 ° C. or higher is desirable, and more preferably an organic solvent having a boiling point of 120 ° C. or higher and a melting point of 90 ° C. or lower. These non-volatile organic solvents preferably have a high boiling point and a low melting point in order to perform the heat treatment in the range of 80 ° C. to 150 ° C. The non-volatile organic solvent is not particularly limited as long as it satisfies the above-mentioned conditions. Among them, the use of a non-volatile organic solvent having a high polarity is preferable because water uniform dispersibility is good. Examples of the non-volatile organic solvent will be described below, but it should not be construed that the invention is limited thereto. Basic organic solvents include pyridine and TMED. Glycerin, glycerin polymer, sorbitol, polyhydric alcohols such as alkanediols having 1 to 4 carbon atoms, those having 6 to 2 carbon atoms having an ester group, a hydroxyl group and a carboxyl group as substituents
2, fatty acids such as saturated fatty acids, unsaturated fatty acids, and branched fatty acids; synthetic esters such as fully esterified and partially esterified polyhydric alcohols and fatty acids; and various fats and oils such as vegetable fats and animal fats. it can. The amount of the nonvolatile organic solvent is preferably 0.01% by weight with respect to xanthan gum, and one or more nonvolatile organic solvents can be blended. When the amount is 0.01% by weight or less, the effect is not sufficient, and when 5% by weight, sufficient salt resistance and water uniform dispersibility can be obtained.
The effect is the same even when 5% by weight or more of the nonvolatile solvent is present.

To produce xanthan gum containing a non-volatile organic solvent, the starting material xanthan gum and the starting material non-volatile organic solvent are mixed and further heated.
0 ° C or higher, preferably 80 to 150 ° C for 15 minutes to 50 hours, more preferably 100 to 150 ° C for 15 minutes to 6 hours, even more preferably 120 to 150 ° C for 15 minutes to
4 hours. Under these conditions, a short time on the high temperature side is desirable. If the heating temperature is low, the content of the non-volatile organic solvent is not sufficient, and if heated for a long time, the possibility of coloring increases. The above-mentioned heating is not particularly limited with respect to the heating method and the heating medium, but includes the following methods.
For example, there is a method in which xanthan gum powder is dispersed using a sufficient nonvolatile solvent, and after heating, unnecessary nonvolatile solvents are removed by filtration or lightly washed with a volatile organic solvent.
Alternatively, there is a method of heating under a normal pressure or a pressurized condition in a volatile solvent having a low boiling point to remove unnecessary volatile solvent by filtration or distillation. Furthermore, there is a method of adding a non-volatile organic solvent to xanthan gum and heating in a gas.
In any of the methods, it is desirable to remove air or replace the air with an inert gas which does not react with xanthan gum, because heating and coloring are observed in a system in which oxygen is present. Examples of the gas include air, nitrogen, oxygen, carbon dioxide, helium, argon and the like. The method for treating xanthan gum described above can be used not only in the direct use of commercially available powdery or granular xanthan gum, but also in the production process of producing xanthan gum by fermentation.

[0008] Xanthan gum containing a non-volatile organic solvent produced by the above method differs from conventional xanthan gum in its high viscosity characteristics. That is, the xanthan gum containing the non-volatile organic solvent of the present invention is added to water so that the xanthan gum concentration becomes 0.5% by weight,
When stirred at ℃ for 1 hour, 2000 to 30000 mPa
-Indicates the viscosity of s (B-type viscometer 6 rpm 25 ° C). Dispersion conditions were rigorously compared to determine uniform dispersibility.
That is, the product of the present invention was added to water so as to have a xanthan gum concentration of 0.5% by weight, stirred at 25 ° C. to 80 ° C. for 1 hour, dispersed and cooled to 25 ° C., and the viscosity was compared. The difference in viscosity was in the range of 0-50%. On the other hand, a dried product of conventional xanthan gum (90 ° C., 6
0.5 h% aqueous dispersion at 25 ° C for 1980)
Although the viscosity at 25 ° C. of the 0.5% by weight dispersion aqueous solution at 80 ° C. is reduced by 60% or more at 1100 mPa · s, the dispersion temperature of the non-volatile organic solvent-containing xanthan gum of the present invention is It is surprising because it maintains a high viscosity even if it is different and has a high dispersibility. In addition, when the non-volatile organic solvent is added and not heated, there is no difference in physical properties, so the essential condition of the present patent is that xanthan gum and the non-volatile organic solvent as the second component are mixed and heated. is there.

The xanthan gum containing a non-volatile organic solvent of the present invention can be used for the same applications as conventional xanthan gum, but in that case, the same thickening effect can be exhibited with a smaller dose than the conventional product. At that time, the thickening effect can be exhibited without impairing the salt resistance and the water uniform dispersibility of the aqueous solution. Such a nonvolatile organic solvent-containing xanthan gum of the present invention can be used alone or in combination with other aqueous gelling agents, aqueous thickeners, salts, acids, emulsifiers, etc. to obtain stable gels, thickeners, and emulsions. be able to. Therefore, the non-volatile organic solvent-containing xanthan gum of the present invention is used as a thickener, a stabilizer, and an additive in general industrial fields including the fields of food, cosmetics, agrochemicals, pharmaceuticals, petroleum and paints. Can be EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, Comparative Examples, and Reference Examples, which are intended to exemplify the present invention and do not limit the present invention in any way.

[0010]

EXAMPLES Examples and comparative examples of the present invention will be described below. <Comparative Production Example 1 of Conventional Xanthan Gum> Xanthan gum powder was dried at 90 ° C, 105 ° C, and 125 ° C in the air. A sample was taken out during the drying process and the physical properties were compared. Xanthan gum is added to water so as to have a concentration of 0.5% by weight and stirred at 25 ° C. for 1 hour, or 80 ° C.
For 1 hour, cooled to 25 ° C., and measured for viscosity (B-type viscometer: 6 rpm, 25 ° C., rotor No. 2 or No. 3). The two aqueous solutions were compared to compare the water uniform dispersibility. Further, the 25 ° C. dispersion solution was mixed with an equal amount of a 1% by weight sodium chloride solution, and the dispersibility was compared to examine salt resistance. The results are shown in Tables 1 to 3.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

[Table 3]

From Tables 1 to 3, it can be seen that the dried xanthan gum has an increased viscosity, but at the same time, a reduced salt resistance, and the difference in viscosity between the dispersion at 25 ° C. and the dispersion at 80 ° C. increases. Is worse.

<Production Example 1 of xanthan gum containing nonvolatile organic solvent>
Added to butylene glycol and heated at 90 ° C. The sample was removed during the heating step and washed lightly with ethanol. Ethanol was distilled off under reduced pressure. Comparative Production Example 1
Physical properties were compared in the same manner as in. Table 4 shows the results.

[0016]

[Table 4]

From Table 4, it can be seen that the xanthan gum containing the non-volatile organic solvent has a higher viscosity than conventional products, and has good salt resistance and uniform water dispersibility.

<Production Example 2 of Xanthan Gum Containing Non-Volatile Organic Solvent> Xanthan gum powder was mixed with 5 weight times the amount of stearic acid monoglyceride and heated at 105 ° C. The sample was taken out during the heating step, and the stearic acid monoglyceride was removed by hot filtration. The physical properties were compared in the same manner as in Comparative Production Example 1. Table 5 shows the results.

[0019]

[Table 5]

From Table 5, it can be seen that the xanthan gum containing the non-volatile organic solvent has a higher viscosity than the conventional product, and has good salt resistance and uniform water dispersibility.

<Production Example 3 of Xanthan Gum Containing Nonvolatile Organic Solvent> Xanthan gum powder was mixed with trimethylethylenediamine (TMED) in an amount of 3 times by weight and heated at 105 ° C. The sample was taken out during the heating step, and TMED was removed by filtration. The physical properties were compared in the same manner as in Comparative Production Example 1. Table 6 shows the results.

[0022]

[Table 6]

From Table 6, it can be seen that the xanthan gum containing the non-volatile organic solvent has a higher viscosity than the conventional product, and has good salt resistance and uniform water dispersibility.

<Production Example 4 of Xanthan Gum Containing Nonvolatile Organic Solvent> Xanthan gum powder was mixed with soybean oil in an amount of 5 times by weight and heated at 125 ° C. A sample was taken out during the heating step, and soybean oil was removed by hot filtration. The physical properties were compared in the same manner as in Comparative Production Example 1. Table 7 shows the results.

[0025]

[Table 7]

From Table 7, it can be seen that the xanthan gum containing the non-volatile organic solvent has a higher viscosity than conventional products, and has good salt resistance and uniform water dispersibility.

<Production Example 5 of Xanthan Gum Containing Non-Volatile Organic Solvent> A hexane solution of soybean oil was added to xanthan gum powder so that the soybean oil was 3% by weight with respect to xanthan gum, and hexane was distilled off under reduced pressure at room temperature. . The obtained xanthan gum powder was dried at 125 ° C. in air. The sample was taken out during the drying step, and the physical properties were compared in the same manner as in Comparative Production Example 1. Table 8 shows the results.

[0028]

[Table 8]

From Table 8, it can be seen that the xanthan gum containing the non-volatile organic solvent has a higher viscosity than conventional products, and has good salt resistance and uniform water dispersibility.

<Comparative Production Example 2 of Conventional Xanthan Gum>
A hexane solution of soybean oil was added to the samples in Table 3 of Comparative Production Example 1 so that the soybean oil was 3% by weight based on xanthan gum, and hexane was distilled off under reduced pressure at room temperature. The physical properties were compared in the same manner as in Comparative Production Example 1. Table 9 shows the results.

[0031]

[Table 9]

Comparing Tables 3 and 9, it was found that there was no difference in physical properties when heating was not performed after adding soybean oil to xanthan gum.

[0033]

The non-volatile organic solvent-containing xanthan gum of the present invention is a water-soluble thickener having high viscosity characteristics,
It has excellent salt resistance and uniform dispersion in water when made into an aqueous solution.

Claims (11)

[Claims] 1. A xanthan gum containing a non-volatile organic solvent, which is produced by heating xanthan gum containing not less than 0.01% by weight of a non-volatile organic solvent at 80 ° C. or more. 2. A method for producing xanthan gum containing a nonvolatile organic solvent, comprising heating xanthan gum containing not less than 0.01% by weight of a nonvolatile organic solvent at 80 ° C. or more. 3. The method for producing xanthan gum containing a nonvolatile organic solvent according to claim 1, wherein the nonvolatile organic solvent has a boiling point of 100 ° C. or higher. 4. A non-volatile organic solvent having a boiling point of 120 ° C. or higher,
The method for producing xanthan gum containing a nonvolatile organic solvent according to any one of claims 1 to 3, wherein the melting point is 90 ° C or less. 5. The non-volatile organic solvent according to claim 1, wherein the non-volatile organic solvent has one or more substituents selected from an ester group, a hydroxyl group and a carboxyl group. For producing xanthan gum containing a neutral organic solvent. 6. The method for producing xanthan gum containing a nonvolatile organic solvent according to claim 1, wherein the nonvolatile solvent is a basic organic solvent. 7. The heat treatment is performed at 80 to 150 ° C. for 15 minutes to 5 hours.
The method for producing xanthan gum containing a nonvolatile organic solvent according to any one of claims 1 to 6, wherein the time is 0 hour. 8. The heat treatment is performed at 100 to 150 ° C. for 15 minutes or more.
The method for producing xanthan gum containing a non-volatile organic solvent according to any one of claims 1 to 6, wherein the time is 6 hours. 9. The heat treatment is performed at 120 to 150 ° C. for 15 minutes or more.
The method for producing xanthan gum containing a nonvolatile organic solvent according to any one of claims 1 to 6, wherein the treatment is performed for 4 hours. 10. The nonvolatile organic solvent according to claim 1, wherein the heat treatment is performed in an organic solvent containing the nonvolatile organic solvent in a concentration of 0.1% by weight or more. A method for producing xanthan gum. 11. The heat treatment is performed in a gas after spraying a nonvolatile organic solvent on xanthan gum.
0. The method for producing a xanthan gum containing a nonvolatile organic solvent according to any one of 0.