JPH01231879A - Removal of oil and fat - Google Patents

Abstract

PURPOSE:To obtain an extracted solution suitable as high-quality drink, etc., free from turbidity by treating an extracted solution of plant seeds containing fats and oils by a two-phase type and a three-phase type centrifugal separator and filtering the solution by a filter at low temperature to completely remove fats in the extracted solution. CONSTITUTION:First, plant seeds containing fats and oils are roasted and extracted with water. Then the extracted solution is centrifuged by a two-phase type and a three-phase type continuous centrifugal separator, further cooled, filtered by a filter (preferably made of paper having 1-25mum meshes) so that fats and oils eluted in the extracted solution are removed from the extracted solution.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to extracting oil-rich plant seeds such as coffee beans, pigeon wheat, barley, etc. using water as a solvent.
The present invention relates to a method for removing fats and oils leached into the extract from the extract. More specifically, the present invention relates to a method for removing fats and oils from an extract by centrifugation, filter filtration, or the like.

(Conventional technology) Plant seeds such as coffee beans, pigeon wheat, and barley have oil and fat content (
(11-12% in green coffee beans, about 6% in pigeon wheat, and about 3% in barley) is relatively high, especially if it is deeply roasted or finely ground for extraction. During extraction, the oil contained in the extract leaches out and becomes mixed with the extract and becomes suspended, making it difficult to separate the oil. Moreover, these oils and water form an O/W emulsion (oil-in-water emulsion), but if left standing for a long time, the oil separates from the water and floats to the surface, creating what is called a "ring" of oil. become.

The formation of such rings significantly reduces the value of the product.

However, in the case of coffee drinks, milk is often added, and homogenization is performed to prevent milk fat from floating and disperse it, so when roasted coffee is extracted with hot water, the milk content is removed from the coffee beans. Even if the fat content that had been in the process is eluted, the homogenization process makes it difficult for the oil content to float to the surface. On the other hand, when it comes to coffee drinks or barley tea drinks that do not contain added milk, it is known that the oil in the drinks rises to the surface and forms rings when stored for a long period of time. While the container (such as a can or paper container) was in use, the presence of the ring rarely caused a problem.

However, as containers have become more diversified, transparent containers can also be used, and it has become necessary to remove oil. However, since the oil exists in the form of an O/W emulsion, the oil cannot be completely removed by treatment with a centrifuge, and it has been impossible to remove it in a short time.

(Problem to be Solved by the Invention) When plant seeds are roasted, the plant tissue is carbonized along with the dissipation of water and carbon dioxide gas, so the oils and fats contained in the seeds are in an unstable form in the plant tissue. comes to exist.

Therefore, when extraction is performed with boiling water, the extract is extracted together with the soluble solids, and the extract becomes a suspension in which fats and oils are mixed and dispersed, and the liquid has a cloudy appearance. Even when this liquid was centrifuged (using a three-phase centrifuge), a completely clear liquid could not be obtained. Furthermore, repeated processing using a three-phase centrifuge has the disadvantage that flavor components are removed. Therefore,
SUMMARY OF THE INVENTION In order to solve these problems of turbidity, it is an object of the present invention to provide a method for removing fats and oils to prevent the floating separation of fats and oils during long-term storage and formation of rings.

(Means for Solving the Problems) It has been found that oil present in plant seed extracts causes turbidity and the formation of rings during long-term storage. The present invention provides a method for removing fats and oils, which is characterized in that fats and oils that could not be completely removed in the past are treated with a two-phase or three-phase centrifugal separator and then filtered at a low temperature.

When a plant seed is roasted, especially if it is deeply roasted, it leaches out onto the surface of the seed and becomes shiny with oil.

If this is extracted with hot water, it will dissolve into the extract and form a suspension, making separation difficult.

In the oil and fat removal method of the present invention, after first obtaining an extract, it is preferably cooled to 10 to 40°C in a cooler, and insoluble components are precipitated in a two-phase separation type centrifuge (3000 to 7000G). Perform separation.

Next, a three-phase separation type centrifuge (3000~10.0O
OG) to promote the floating of fats and oils. In this three-phase centrifugal separator, most of the fats and oils float to the surface due to the difference in specific gravity and are removed, but they are not completely removed and a small amount remains.

Further, the liquid is preferably cooled to 0 to 10° C. to reduce the fluidity of the oil and fat, and then filtered through a filter, thereby adsorbing the oil and fat in the liquid to the filter and completely removing it.

The filter used is not particularly limited as long as it can adsorb or filter fats and oils. Preferably, it is a fibrous filter made of cotton, paper, cellulose, resin, etc. with a mesh size of 1 to 251 m.

The extract from which fats and oils have been completely removed by the method of the present invention has no turbidity and does not form rings even after long-term storage, improving the quality of the beverage and allowing it to be filled into transparent containers. It can also respond to diversification.

Example Coffee beans of the Arabica variety (Brazil Santos 415) were roasted and ground (L value -17). 50 kg of ground coffee beans are placed in a brewing machine equipped with a 60-mesh wire mesh and extracted with boiling water at 90°C.

Use 600η of boiling water and boil the extract at 52 (1 (Brix 2)
．． 8) Obtained I;. The extract was passed through a 100 mesh strainer, cooled to 25°C in a cooler, and collected in a tank.

Next, the extract was collected in a tank and transferred to a two-phase centrifuge (DeLaval BRPX-407-3 manufactured by Alfa Laval).
GV-34), 6200 G, 3.5 t/h to remove insoluble components, and then a three-phase centrifugal separator (Delaval type MAPX-210-TGT-74 manufactured by Al7 Arrabal), 620
Remove fat and oil at 0G and 3.5t/h. Furthermore, the liquid after centrifugation was cooled to 300 ℃ and filtered through a 5 μm mesh cartridge filter (manufactured by Cuno) to completely remove fats and oils (Sample A).

Comparative Example Extraction and treatment were carried out in the same manner as in Example (Sample A), but at the final temperature of 150 ml without passing through a 5μ melon mesh filter.
It was passed through a mesh strainer into the tank (sample B).

Extraction was carried out in the same manner as in Example (Sample A), but the centrifugation process was performed using a two-set centrifuge, and instead of the final filtration with a 5 μm mesh filter, the sample was passed through a 150 mesh strainer into the tank. (Sample C).

Extracted in the same manner as in Example (Sample A), the 13 extract was
Phase centrifugation was not performed, and the sample was passed through a three-phase plastic centrifuge at 25°C three times, and passed through a 150-mesh strainer in the same way as Samples B and C (Sample D).
.

Example (Sample A) and Comparative Example (Sample B.

Brix is 1.2 for each sample solution in C and D).
Dilute it so that it becomes 138, then add 7% sugar.
After sterilization at 86°C for 8 seconds, the mixture was filled into plastic bottles at 86°C, cooled to 40°C, and then subjected to a storage test at 5°C to observe the floating and turbidity of fats and oils, and to compare the flavor. The results are shown in the table below.

From the results in the table, it is clearly seen that by using the method of the present invention, most of the oil and fat content in the coffee extract is removed without causing a decrease in flavor. In addition, in the case of sample D, the oil and fat content was successfully removed, but the aroma and taste were both weak and unbalanced, making it somewhat difficult.

(Effects of the Invention) By using the method for removing fats and oils of the present invention, fats and oils in extracts of plant seeds containing fats and oils can be removed without deoiling the plant seeds as raw materials and without causing a decrease in flavor. It is possible to obtain an excellent quality extract that is free from turbidity and does not form rings even during long-term storage.

Furthermore, the fat-free beverage obtained by the present invention is
Does not cause discomfort due to the presence of fats and oils when drinking,
In addition, it can be filled into transparent containers, etc., making it possible to respond to the diversification of products.

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Claims (4)

[Claims] (1) The fats and oils eluted into the extract obtained by roasting plant seeds containing fats and oils and extracting them with water are centrifuged using a two-phase centrifuge and a three-phase continuous centrifuge, and then cooled. A method of removing it from the extract by filtration with a post-filter. (2) The method according to claim 1, wherein the temperature of the extract is adjusted to 10°C to 40°C before centrifugation. (3) The method according to claim 1, wherein the temperature of the extract is adjusted to 0°C to 10°C and filtered. (4) The material of the filter is selected from cotton, paper, cellulose, or resin, and the pore size of the filter is 1.
2. The method according to claim 1, wherein the diameter is between .mu.m and 25 .mu.m.