JP2006063252A - Manufacturing process of oil highly containing diglyceride - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient and commercial manufacturing process of an oil with a high content of diglycerides. <P>SOLUTION: The manufacturing process of the oil with a high content of diglycerides comprises adding an aqueous solution containing 50-90 mass% of an organic acid to an oil containing ≥30 mass% of diglycerides in the amount of 0.05-5 mass% of the oil, mixing the mixture continuously for 0.1-10 minutes in a line mixer, washing it with water and deoderizing it. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing fats and oils containing a large amount of diglycerides.

  Diglycerides have been found to have an effect of reducing body fat accumulation and preventing obesity (Patent Documents 1 and 2) and an effect of reducing blood cholesterol level together with plant sterols (Patent Document 3). From such a viewpoint, fats and oils having a high diglyceride content have been widely used as domestic cooking oils.

  Fats and oils with a high diglyceride content are produced by esterification reaction of fatty acids and glycerin, transesterification reaction of fats and oils and glycerin, etc., so they contain impurities such as free fatty acids and metals. Needs to be purified by deoxidation or deodorization. Here, since high-purity diglyceride significantly reduces the diglyceride content due to decomposition, disproportionation reaction, and the like at high temperatures, it is necessary to suppress the diglyceride to maintain high purity.

As a method for purifying fats and oils having a high diglyceride content, a method of performing a deodorizing treatment after adding an organic acid to the fats and oils is known (Patent Document 4).
Japanese Unexamined Patent Publication No. 4-300826 JP-A-10-176181 WO 99/48378 pamphlet JP-A-4-261497

However, in the above method, it is necessary to dehydrate under reduced pressure after adding an organic acid to fats or oils, or after decoloring after dehydration under reduced pressure, there is a problem as an industrial purification method .
Accordingly, an object of the present invention is to provide a method for producing a high-purified diglyceride-containing fat and oil that is efficient and simple in flavor and has a good flavor and is useful as an edible oil.

  Therefore, the present inventor added a very small amount as an aqueous solution containing an organic acid at a high concentration of 50 to 90% by mass to fats and oils having a high diglyceride content, and the stirring was continuously performed in a line mixer instead of in a tank. It has been found that a decrease in the purity of diglyceride can be suppressed in the subsequent deodorizing operation despite the fact that the process is not required and the treatment is extremely short. Furthermore, it discovered that the fats and oils which carried out this process, and which were deodorized after washing with water also had favorable flavor.

  That is, in the present invention, 0.05 to 5% by mass of an aqueous solution containing 50 to 90% by mass of an organic acid is added to oils and fats containing 30% by mass or more of diglyceride, and 0.1 to 10 continuously by a line mixer. A method for producing an oil and fat with a high diglyceride content is provided which is mixed and then washed with water and then deodorized.

  According to the production method of the present invention, a decrease in the purity of diglyceride is suppressed, and an oil and fat having a high diglyceride content with good flavor and simple operation can be obtained efficiently. Therefore, according to the method of the present invention, an edible fat with a high diglyceride content can be obtained industrially in large quantities.

  The fats and oils used in the method of the present invention are fats and oils containing 30% by mass or more of diglycerides, but fats and oils containing 35% by mass or more, further 50% by mass or more, further 70% by mass or more, and particularly 80 to 95% by mass of diglyceride are preferable. .

  The constituent fatty acid of the fat is not particularly limited, but preferably contains 50% by mass or more, particularly 80% by mass or more of unsaturated fatty acid from the viewpoint of physiological effects. Moreover, it is preferable from the point of the physiological effect that carbon number of a constituent fatty acid is 14-24, especially 16-22.

The origin of fats and oils with a high diglyceride content used in the present invention may be vegetable or animal fats. Specific examples of the raw material include rapeseed oil, sunflower oil, corn oil, soybean oil, rice oil, safflower oil, cottonseed oil, and beef tallow. In addition, those obtained by separating and mixing these oils and fats, those obtained by adjusting the fatty acid composition by hydrogenation, transesterification, or the like can be used as raw materials.
The fats and oils having a high diglyceride content used in the present invention can be obtained by the esterification reaction between fatty acids derived from fats and oils and glycerin, the transesterification reaction between fats and fats and glycerin, and the like. Excess monoacylglycerol produced by the reaction can be removed by molecular distillation or chromatography. These reactions can also be carried out by chemical reactions using an alkali catalyst or the like, but it is excellent in terms of flavor and the like to carry out the reaction under mild conditions enzymatically using a 1,3-position selective lipase or the like. It is preferable.

  In the present invention, the organic acid is preferably citric acid, succinic acid, maleic acid, oxalic acid, particularly citric acid. First, 0.05 to 5% by mass of an aqueous solution containing 50 to 90% by mass of an organic acid is added to the oil or fat. When the concentration of the organic acid aqueous solution is less than 50% by mass, the effect of adding the organic acid is not sufficient, and the effect of improving the flavor is not sufficient. Moreover, when it exceeds 90 mass%, a liquid physical property will deteriorate and workability | operativity will fall. Moreover, when organic acid aqueous solution is added exceeding 5 mass% with respect to fats and oils, pressure reduction dehydration will be needed after mixing. Moreover, if it is less than 0.05 mass%, the effect by organic acid addition is not enough. The addition temperature of the organic acid aqueous solution is preferably 0 to 100 ° C, more preferably 25 to 90 ° C. The adding means is a small amount of the organic acid aqueous solution, so it is not necessary to add it in portions, and it can be added all at once.

Next, the said fats and oils which added a small amount of organic acid aqueous solution are continuously mixed in a line mixer for 0.1 to 10 minutes. Preferably, mixing is performed for 0.2 to 5 minutes. Here, the line mixer refers to a device that mixes while flowing a fluid using a baffle plate or a mechanical stirrer provided in a pipe.
The use of the line mixer is industrially advantageous because it is continuously mixed by passing through the mixer and the oil and fat do not need to stay in the tank. If the mixing time is less than 0.1 minutes, a sufficient diglyceride purity-inhibiting effect cannot be obtained, and if it exceeds 10 minutes, the apparatus becomes large, and the flavor improving effect of the oil and fat deodorized after washing is reduced. Here, mixing time means the average residence time of the fats and oils in a line mixer.
Further, the mixing is preferably performed by mechanical stirring and mixing, and the tip peripheral speed of the mixing blade of the mixer is set to 1 to 20 m / s, particularly 2 to 10 m / s. It is preferable from the viewpoint of reducing the amount.

  Oils and fats mixed for 0.1 to 10 minutes are continuously washed with water. There is no need to perform dehydration or adsorption. Washing with water is preferably carried out by mixing the fats and oils with water and then separating the water. In addition, the water used for this water washing may contain lower alcohols, such as about 0.01-10 mass% ethanol and isopropanol. Here, the amount of water used for one washing is preferably 5 to 200% by mass and more preferably 10 to 50% by mass with respect to the fats and oils. The washing temperature is preferably 25 to 95 ° C. Washing with water is performed 1 to 5 times.

  Oil and fat washed with water is deodorized. As the deodorizing treatment, steam distillation is preferable. The steam distillation is preferably performed under conditions of 240 ° C. or less from the viewpoint of suppressing the decrease in the purity of diglyceride and improving the flavor. The amount of water vapor to be used is preferably 0.5 to 20% by mass, particularly 1 to 10% by mass with respect to the fat and oil.

  The refined diglyceride-rich fats and oils obtained by the method of the present invention are useful as edible fats and oils that have high diglyceride content and good flavor and high physiological effects because the decrease in diglyceride purity is suppressed.

Example 1
Fatty acid and monoglyceride were removed from the esterified product obtained by esterification of rapeseed oil and soybean oil-derived fatty acid with glycerin by molecular distillation. Further, 0.4% of a 50% aqueous citric acid solution was added to the oil and fat at 90 ° C., and then immediately mixed with a line mixer (tip peripheral speed 6.4 m / s). The operation of oil / water separation was repeated three times after adding 10% water to the oil / fat and mixing. Furthermore, the deodorizing process by steam distillation was performed at 240 degreeC for 2 hours. The diglyceride content was measured by gas chromatography. Moreover, evaluation of flavor was performed by sensory evaluation according to the following criteria. The results are shown in Table 1.
○: Flavor is good.
Δ: Slightly inferior in flavor
X: Flavor is inferior.

Example 2
The same operation as in Example 1 was performed except that the concentration of the citric acid aqueous solution was 80%. However, the addition amount was set so that the amount of citric acid was the same as that of the oil. The results are shown in Table 1.

Comparative Example 1
The same operation as in Example 1 was performed except that the concentration of the citric acid aqueous solution was 2%. However, the addition amount was set so that the amount of citric acid was the same as that of the oil. The results are shown in Table 1.

Comparative Example 2
Fatty acid and monoglyceride were removed from the esterified product obtained by esterification of rapeseed oil and soybean oil-derived fatty acid with glycerin by molecular distillation. Furthermore, after adding 1% of a 20% aqueous citric acid solution to this fat and oil, mixing in a stirring layer at 90 ° C. for 60 minutes (tip peripheral speed 5 m / s), followed by dehydration at 90 ° C. and 2 Torr for 60 minutes, The operation of oil / water separation was repeated three times after adding 10% water to the oil / fat and mixing. Deodorization was performed by steam distillation at 240 ° C. for 2 hours. Table 1 shows the results.

Claims (2)

  An aqueous solution containing 50 to 90% by mass of an organic acid to an oil or fat containing 30% by mass or more of diglyceride is added to the oil and fat in an amount of 0.05 to 5% by mass and continuously mixed with a line mixer for 0.1 to 10 minutes, followed by washing with water. And then deodorizing, a method for producing a refined diglyceride-rich oil and fat.   The production method according to claim 1, wherein the deodorizing treatment is steam distillation.