KR20020093504A - Method of preparing the powdered green tea - Google Patents

Abstract

PURPOSE: Provided is a method for producing high quality of green tea powders having improved colors by minimizing destruction of green tea nutrients such as chlorophyll and vitamin C. CONSTITUTION: The method for producing green tea powders comprises pulverizing green tea leaves with an air pulverizer containing a cyclone classifier and 3 to 4 pulverizing chambers to produce green tea powders having the particle size of 100 mesh, wherein the air pulverizer pulverizes green tea leaves using air current produced from between the sawtooth and a high speed rotating impeller. Alternatively, the method for producing green tea powders is manufactured by pulverizing roughly green tea leaves with a crusher to have particle size of 10 mesh and pulverizing the roughly pulverized green tea leaves with an air pulverizer.

Description

Method of preparing the powdered green tea {Method of preparing the powdered green tea}

The present invention relates to a method of manufacturing green tea by pulverizing green tea, and more particularly, green tea is pulverized by using an air flow type grinder capable of pulverizing fibers with little generation of heat due to friction between the pulverized product and the pulverized medium. By the preparation of less chlorophyll, vitamin C and other components of the destruction of the method relates to a powder green tea excellent in color and quality.

Green tea is produced by inactivating the oxidase activity in the tea leaves using the shoots or leaves of Camellia sinensis of Camellia family. Green tea has not only been consumed as a symbol tea since BC, but as the pharmacological mechanism of various components of green tea is gradually revealed, its value is re-recognized. Polyphenols (catechins), amino acids, vitamin C It contains a large amount of active ingredients such as beta-carotene and dietary fiber is known to be excellent in hangover and nicotine detoxification, fatigue recovery, skin care, diabetes, constipation improvement. In particular, the attention of the antioxidant, anti-cancer, lowering blood cholesterol, anti-aging, heavy metal detoxification, caries prevention and bad breath removal action by the polyphenols contained in green tea is the most attention.

In particular, if you drink green tea in water, drink only the water-soluble ingredients contained in green tea, and discard the rest. In the case of powdered green tea, this does not happen. For example, tocopherol, fat-soluble vitamin A, There is an advantage that you can eat all the fiber. In addition, a cup of powdered green tea contains 5 to 6 times the amount of vitamin C of lemon, which is also useful as a source of vitamin C.

In addition, the powdered green tea is not only ingested as tea, but also added to milk, yogurt, ice cream, and the like, as well as being used in various fields such as baking, bakery, confectionery, and cosmetics.

Such green tea is obtained by grinding green tea with a grinding device. In general, the principle of grinding solids is classified into compression, impact, wear, and cutting, and this principle is commonly used in grinding equipment. Among the grinding principles, compression is used to coarse hard solids, impact is used together with coarse or fine grinding, abrasion is used to grind soft and abrasive materials into fine powder, and cutting is used to produce particles of a certain size or shape. Used. On the other hand, the crusher can be classified into a crusher (crusher), a grinder (grinder) and the like. A crusher is a device for crushing a large chunk of solid into a size of 6 to 250 mm, and examples of the apparatus include a jaw crusher and a gyratory crusher. A powder mill is a device that produces a powder of 1 to 500㎛ of the first pulverized powder in the crusher, or prepares fine powder without the first pulverization. Hammer mill, roller mill, ball mill ), Attrition mills and air-flow type mills. Currently widely used grinders are hammer mills, roller mills, ball mills, etc., and are mainly used in chemical companies, food industries, and feed industries, and are widely distributed in small mills.

Even when the green tea is pulverized to produce powdered green tea, the above-mentioned grinding device, in particular, an electric mill, a ball mill, a hammer mill, and the like are used.

However, in the case of grinding green tea using an electric mill, ball mill, hammer mill, etc., the grinding time is long, and the temperature rises due to the friction between the pulverized product and the pulverized medium due to the grinding principle. There are problems such as deterioration due to occurrence, color change and quality deterioration due to loss of inherent fragrance. In particular, chlorophyll, which is an important influence on the color of green tea, vitamin C, which is a measure of green tea quality, is unstable in heat, and thus there is a problem that these components are lost in the grinding process.

Moreover, the above pulverizers are not capable of pulverizing the fiber, there is a problem that the productivity is reduced in the production of powdered green tea.

Thus, the present inventors have been studied a method that can solve the above problems caused by the grinding method in the manufacturing of conventional green tea, and when the green tea is pulverized using an air flow grinder with a cyclone classifier It is possible to grind the stem part of the green tea with a lot of fiber, so that the productivity is good, and there is little heat generation during the grinding, so that there is little destruction of green tea components such as chlorophyll and vitamin C, and thus, powder green tea having excellent color and quality can be manufactured. To complete.

Accordingly, it is an object of the present invention to provide a method for producing powder green tea having excellent color and quality with good productivity.

Other objects than the above objects and features of the present invention will become apparent to those skilled in the art from the configuration of the following invention.

In order to achieve the above object, the manufacturing method of the powdered green tea according to the present invention is characterized in that it comprises the step of crushing the green tea using a cyclone classifier having a cyclone classifier, the grinding chamber is three to four. .

Hereinafter, the present invention will be described in detail.

Since the powdered green tea provided by the present invention uses an airflow grinder, the fibrous portion is also pulverized to have good productivity, and no heat is generated by friction, so chlorophyll, vitamin C, and the like are not destroyed, and thus color and quality are excellent.

The air flow type grinder used in the present invention is a particle that is frequently collided by the air flow formed between the high speed rotating impeller and the sawtooth shape of the grinding area to be pulverized, the grinding chamber of the air type grinder to 3 to 4 By dividing the sawtooth shape of each grinding chamber by applying various grinding principles, it is possible to grind a lot of fiber like stems of green tea. crushing-to be crushed and collided with each other) to allow crushing into fine powders.

In addition, if a double cyclone classifier is installed together with the air type crusher and the pulverized crushed product is automatically supplied to the classifier, the coarsely crushed particles can be returned to the crusher to provide a continuous crushing and classification circuit. , The green tea containing the stem part can be crushed easily and quickly, and the powder green tea having a uniform particle size can be obtained.

Powdered green tea according to the present invention may also be obtained by pulverizing using an air flow grinder, but after the green tea is put into a crusher and coarsely pulverized so that the particle size of the green tea is 10 mesh (17 mm) or less, the coarsely pulverized above. It can also be obtained by grinding green tea to 100 mesh (150 μm) or less using an air flow grinder.

Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited only to these examples.

<Example 1>

20kg of green tea leaves including stems were introduced using a air flow grinder (HTM-200, Hyunjoon Powder) equipped with a cyclone classifier, and then the green tea was pulverized for 1 hour at a speed of 8000rpm and a inverter inverter 50Hz. Powdered green tea having a value of 100 mesh (150 µm) or less was obtained.

<Example 2>

After coarsely crushing the green tea leaves including the stems to less than 10 mesh (17 mm) in the crusher, 20 kg of the coarsely crushed green tea leaves were introduced using an air flow grinder (HTM-200, Hyunjoon Powder) equipped with a cyclone classifier. Green tea was pulverized for 1 hour at a mill speed of 8000 rpm and a classifier inverter of 50 Hz to obtain a powder green tea having a particle size of 100 mesh (150 μm) or less.

Comparative Example 1 Grinding of Green Tea Using a Ball Mill 1

Using a ball mill in which 250 ceramic balls (ø25mm) were put in a rotating drum (drum rotation speed 60 rpm), 20kg of green tea leaves including stems were pulverized for 1 hour, and then passed through a 100 mesh sieve to remove powdered green tea of less than 100 mesh. Prepared.

Comparative Example 2 Grinding of Green Tea Using a Ball Mill 2

Using a ball mill in which 250 ceramic balls (ø25mm) were placed in a rotating drum (drum rotation speed 60 rpm), 20kg of green tea leaves containing no stems were pulverized for 1 hour, and then passed through a 100 mesh sieve to powder less than 100 mesh. Green tea was prepared.

Comparative Example 3 Grinding Green Tea Using Hammer Mill

20 kg of green tea including stems were pulverized for 1 hour using a hammer mill (8,000 rpm / 1.5 HP), and then 100 mesh sieves were used to prepare powdered green tea of 100 mesh or less.

Test Example 1 Component Analysis

The components contained in the powdered green tea prepared above were analyzed and shown in Table 1 below.

content Before grinding Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Chlorophyll (mg%) 284 268 275 224 243 219 Vitamin C (mg%) 406 365 384 294 310 286 Catechin (%) 12.4 12.2 12.5 12.0 11.3 12.0 amino acid(%) 2.41 2.34 2.38 2.32 2.24 2.29

As can be seen from Table 1, in the chlorophyll content, Example 1 is 5.6%, Example 2 is 3.2%, Comparative Example 1 is 21.1%, Comparative Example 2 is 14.4%, Comparative Example 3 is 22.9 than before grinding In case of vitamin C content, Example 1 was 10.1%, Example 2 was 5.4%, Comparative Example 1 was 27.6%, Comparative Example 2 was 23.6%, and Comparative Example 3 was 30%. In view of the reduction, the grinding of green tea in an airflow grinder has less destruction of green tea nutrients such as chlorophyll and vitamin C than grinding with a ball mill or hammer mill.

Test Example 2 Color Analysis

The color of the powdered green tea prepared above was analyzed using a color analyzer (Minolta) and the results are shown in Table 2.

content Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 L value (contrast) 63.5 64.1 63.0 63.3 62.8 a-value (-: green) -9.8 -10.2 -9.2 -9.5 -9.1 b value (+: yellow) 24.8 24.5 26.2 25.3 25.9

As can be seen from Table 2, the Example showed that the -a value was 10% or more larger than that of the Comparative Example, which shows less destruction in the process of crushing the chlorophyll contained in the green tea leaves in the airflow grinder. This is because the value of -a is increased.

Test Example 3 Sensory Test

2 g of powdered green tea prepared by the above method was added to 100 ml of water at 60 to 70 ° C., thoroughly stirred in a lane, etc., and subjected to a sensory test by rank method by 10 trained sensory test agents. Table 3 shows.

Item Inspector One 2 3 4 5 6 7 8 9 10 Sum color Example 1 8 8 9 8 8 9 8 8 9 8 83 Example 2 8 9 9 9 8 9 9 9 9 9 88 Comparative Example 1 7 7 7 8 6 8 7 7 8 7 72 Comparative Example 2 6 7 7 7 7 7 7 7 7 7 69 Comparative Example 3 6 6 7 8 7 6 6 7 7 6 66 incense Example 1 8 8 8 7 7 8 8 8 8 9 79 Example 2 8 7 8 8 8 9 8 8 8 9 81 Comparative Example 1 7 7 6 6 6 7 6 6 7 8 65 Comparative Example 2 7 7 6 6 6 7 7 7 6 6 65 Comparative Example 3 6 7 6 6 6 6 6 7 6 7 63

As can be seen from Table 3, it was found that the powdered green tea of the example prepared using the air flow grinder had a color and aroma unique to green tea than the powdered green tea of the comparative example prepared using another grinder.

<Test Example 4> 100 mesh (150㎛) passing amount according to the grinding conditions

In Examples 1 to 2 and Comparative Examples 1 to 3, the amount of green tea obtained by passing 100 mesh bodies was measured, and the results are shown in Table 4 below.

division input Grinding time Yield (kg) Yield (%) Example 1 20 kg 1 hours 17.82 89.1 Example 2 18.90 94.5 Comparative Example 1 7.44 38.7 Comparative Example 2 11.73 58.7 Comparative Example 3 10.62 53.1

From Table 4, the highest yield was obtained when milling using an airflow mill. In other words, when using an air flow grinder, the grinding yield was 35 to 55% higher than when using a ball mill or a hammer mill.

As described above, when the powdered green tea is manufactured using an air flow grinder, it is possible to grind even the fibers contained in the green tea stem, so that the productivity is good, and since the heat generation due to the friction between the powder and the grinding medium is small, chlorophyll and vitamin It is possible to produce powdered green tea with excellent color and quality due to less destruction of green tea nutritional ingredients such as C.

Claims (2)

Grinding room has 3 to 4 green tea, the method of producing a powdered green tea, characterized in that it comprises the step of grinding to 100 mesh or less using an air flow type mill equipped with a cyclone classifier. The method according to claim 1, further comprising the step of coarsely pulverizing the green tea in a crusher before grinding the green tea with an air flow grinder so that the particle size of green tea is 10 mesh or less.