KR100614153B1 - Method for isolating fibers from rice bran - Google Patents

Abstract

The present invention relates to a method of separating dietary fiber from rice bran by heating the rice bran, which has been finely removed, at 100 to 120 ° C. for 10 minutes to 2 hours with water, and drying and pulverizing it. Dietary fiber can be separated from rice bran in high yield.

Rice bran. Dietary Fiber

Description

Method for isolating fibers from rice bran}

The present invention relates to a method for separating dietary fiber from rice bran

Dietary fiber is an ingredient that is excessively contained in foods such as vegetables, fruits, and algae, and refers to a polymer carbohydrate that is released from the body without being digested by human digestive enzymes. There has been much debate about the effectiveness and efficacy of dietary fiber that is not digested and absorbed, but recently it has been re-recognized as an essential ingredient for our body.

Recent studies have shown that dietary fiber has an effective effect on the digestive system, lipid metabolism, and glucose metabolism. The unique conservative and swelling properties of dietary fiber absorb and swell water in the intestine, eliminating constipation, and acting to protect the intestines from toxic and carcinogens. In addition, dietary fiber is effective in the prevention of coronary atherosclerosis, angina pectoris, myocardial infarction disease by inhibiting cholesterol absorption in the digestive tract. In addition, the fiber itself is bulky without energy, and because it gives a feeling of satiety, it is effective in preventing obesity, weight loss, etc. by reducing the intake of food. As mentioned above, as the medical importance of dietary fiber has been emphasized, it has attracted attention as a sixth nutrient following carbohydrates, proteins, fats, vitamins and minerals.

In the past, milling of grains was less common, and foods were consumed in their natural state rather than processed and eaten. However, dietary fiber intake decreased significantly with changes in diet, such as increased meat intake and the consumption of highly refined foods. As obesity and adult diseases are increasing due to excessive intake of nutrition and lack of exercise, intake of dietary fiber is required to prevent and reduce adult diseases.

Rice bran refers to by-products such as skin, seed, and whistle from the process of milling brown rice and consists mainly of rice bran and rice bran. The amount of rice bran produced in rice milling process is about 10% of brown rice, which corresponds to a large amount, but it is not used as food. However, as the nutritional value of rice bran has been reassessed recently, it has been used in a variety of health supplements. In addition, the development of an effective method for separating dietary fiber from rice bran is required. The separation method of rice bran fiber until now used the organic solvent, such as ethanol, or the mixed solvent of water and an organic solvent (Korean Patent Publication No. 1992-0003054).

Therefore, the present inventors confirmed that it is possible to separate the dietary fiber from rice bran in high yield without using harmful organic solvent by a simple process of heating the rice bran, which has been finely removed, at 100 to 120 ° C. for 10 minutes to 2 hours. The invention has been completed.

Accordingly, it is an object of the present invention to provide a method for removing dietary fiber from rice bran by removing fine powder adhering to rice bran and heating it at 100 to 120 ° C. for 10 minutes to 2 hours using water, drying and pulverizing it.

In one embodiment, the present invention provides a method for producing a powder comprising: (i) removing fine powder attached to a rice bran; (ii) heating at 100 to 120 ° C. for 10 minutes to 2 hours with water; And (iii) drying and pulverizing the same.

In step (i), the removal of fine powder can be removed by repeating the washing with water. The fine water can be completely removed by repeating the washing and dehydration about 30 to 100 times, preferably 50 to 70 times while changing the washing water.

In the step (ii), in the heating step using water, the heating temperature is the temperature at which the water containing the rice bran, from which the fine powder has been removed, is boiled, preferably 100 ° C. or higher, preferably 100 to 120 ° C. The heating time is 10 minutes or more, preferably 10 minutes to 2 hours, more preferably 20 to 40 minutes. In this step, when a pressure is applied, the heating time can be shortened. The amount of water used is 5 to 12 times, preferably 6 to 10 times, the rice bran based on the weight of the rice bran.

The type of rice bran used to separate the dietary fiber is not particularly limited. It can be rice bran pretreated by conventional methods. For example, it may be degreasing rice bran removed from fat using hexane.

Since the method uses only water without using an organic solvent, the separation step is simple and inexpensive as compared with the existing method using an organic solvent, and it is safe because no harmful organic solvent remains in the separated dietary fiber.

The drying method is not particularly limited, but for example, freeze drying, vacuum drying, hot air drying, spray drying, reduced pressure drying, spray drying, foam drying, high frequency drying, infrared drying and the like. In the present invention, hot air drying was used.

Hereinafter, the process of separating the dietary fiber from the rice bran is described in more detail.

Step 1: The rice bran is removed using a sieve of 20 to 30 mesh to remove the sacks and rice snow, and is treated for 30 minutes to 3 hours using 50 to 90 ° C of hot water.

Step 2: Removing the fines from the rice bran, washing and dehydration are repeated about 30-100 times, preferably 50-70 times, using water at about 30-80 ° C.

Step 3: The finely ground rice bran is heated with water at 100 to 120 ° C. for 10 minutes to 2 hours.

Step 4: After dehydration, dry and grind to obtain rice bran fiber.

As a result of analyzing the content of rice bran dietary fiber powder prepared by the method at the Korea Food Research Institute, the insoluble dietary fiber content was 61.89%. This is a higher content of dietary fiber than the method of separating the rice bran dietary fiber using a conventional organic solvent. In addition, it was confirmed that the rice bran dietary fiber powder separated by the above method has a water retention inherent in the dietary fiber.

It can be seen that the method of separating the rice bran dietary fiber of the present invention is a useful method for obtaining dietary fiber at a higher efficiency than the conventional method without the risk of harmful organic solvent remaining in the dietary fiber in a simple process of low cost.

The dietary fiber separated by the above method can be used in various foods and medicines. For example, it can be used for low-calorie foods, diet foods, dietary supplements, processed foods and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples. The examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited by the following examples.

Example 1-Separation of Dietary Fiber from Rice Bran

6kg of rice bran is removed using a 26mesh sieve to remove sack and rice snow. Approximately 4.9 kg of rice bran, from which frost and rice snow were removed, was put into 20 liters of hot water at 80 ° C and treated for 1 hour.

Next, the rice bran in water was rubbed to remove fine powder from the rice bran. At this time, about 50 ° C. warm water was used. Washing and dehydration were repeated about 60 times while changing the washing water until it became clear and clear water.

The rice bran, from which the fine powder was completely removed, was placed in 30 liters of boiling water and heated for 30 minutes. It was washed again with clear water.

After dehydration, it was dried for about 4 hours in a hot air dryer and pulverized in a grinder.

Finally, about 1.5 kg of rice bran dietary fiber powder was obtained. Rice bran dietary fiber powder obtained by the above method was requested to the Korea Food Research Institute. As a result, the insoluble dietary fiber content in the rice bran dietary fiber powder was 61.89%.

Example 2 Analysis of Retention Rate of Rice Bran Dietary Fiber

It was confirmed whether the rice bran dietary fiber powder of the present invention obtained by the method of Example 1 has water-retaining property, which is inherent in dietary fiber.

As a control, raw rice bran was used before the separation of the dietary fiber and wheat flour containing no dietary fiber. Rice bran dietary fiber powder, wheat flour and fresh rice bran were divided into 10g each in a transparent cup. We poured water into the cup, mixed it well, and then turned the cup upside down to see how much water reached the level where the contents did not pour.

In the case of 10g of rice bran dietary fiber powder, 50g of water could be absorbed. At this time, the rice bran dietary fiber powder did not dissolve in water, but changed into a sponge while absorbing water and increasing its volume. However, in the case of flour, 50g of water was completely dissolved in water, and turned upside down when the cup was turned upside down. 10 g of fresh rice bran absorbed 20 g of water.

Through this, it was confirmed that rice bran dietary fiber powder separated by the method of the present invention has inherent water retention of dietary fiber.

By using the method of the present invention, it is possible to obtain dietary fiber in a higher yield than the conventional method without risk of remaining harmful organic solvents in the dietary fiber in a simple process at low cost, and the dietary fiber obtained by the above method is used for food or medicine It can be used as a material.

Claims (4)

(Iii) washing with water and dewatering 30 to 100 times to remove fines from the rice bran; (Ii) heating the rice bran with water at 100 to 120 ° C. for 10 minutes to 2 hours; And (Iii) separating the dietary fiber from the rice bran comprising drying and pulverizing the rice bran, from which the fine powder has been removed. The method according to claim 1, wherein in removing the fine powder from the rice bran, the rice bran is degreasing rice bran or undegreased rice bran. The method of claim 1 wherein the heating time is 20 to 50 minutes in heating with water. The method of claim 1, wherein the amount of water used in the heating step is 5 to 12 times the amount of rice bran based on the weight of rice bran.