RU2040965C1 - Method for processing rice grains into groats - Google Patents

Abstract

FIELD: making rice groats. SUBSTANCE: method involves hydrothermal treatment of grains consisting of drying, hulling and abrading of kernels. Hydrothermal treatment consists in boiling the grains for 3-10 min or treating them with superheated steam at 100-105 C for 3-5 min. Drying is carried out for removal of moisture from flower films. EFFECT: higher efficiency. 2 cl, 2 tbl

Description

 The invention relates to cereal production and can be used in the production of rice cereals.

 Known methods for processing rice grains by spraying propionic or nitric acids before peeling rice grains, followed by grinding the rice. The use of propionic or nitric acid changes the physical properties of flower films, this provides better removal of films during peeling of the grain and, therefore, increases the yield of cereals.

 Disadvantages: a high degree of yellowing of rice grains, the need to increase the acid resistance of processing equipment, the complexity of the process of disposal of peeling waste.

A method of processing rice grains in the rump by its moisture to 15-16% otvolazhivaniya for 20-24 hours post-humidification with hot water at 95-98 ^{° C} to a moisture content of 30-32% drying agent to the drying temperature of 120-140 ^o C to humidity of 15-16.5% cooling before peeling to 18-20 ^about C.

 The disadvantage of this method is the high degree of yellowing of the rice caused by long-term smoothing.

 The technical result of this solution is the inactivation of proteolytic and amylolytic enzymes, the consequence of which is the yellowing of grains of rice.

This is achieved in that in the method the hydrothermal treatment is carried out by boiling corn for 3-10 minutes, or treatment with superheated steam at 100-150 ^{° C} for 3-5 min, and after the hydrothermal treatment, drying to remove moisture from flowering films hulled a grain of rice, get a kernel. After peeling core further comprises steaming at 120-130 ^{° C} for 5-10 minutes followed by drying to a moisture content 15,0-15,5%, and cooled.

 The use of heat stroke allows you to slow down or even stop the action of proteolytic and amylolytic enzymes, which causes yellowing of cereal grains.

 A characteristic feature of domestic technologies is the moisture treatment of rice grains at the first stage, which is necessarily accompanied by a mass yellowing of rice cereal grains. And, if in Asian countries cereals with yellowed grains are used for cooking quietly, then in European countries such cereals are not used at all. Therefore, it is especially important to get rice cereal without yellowed grains.

When exposed to temperatures less than ^{100 °} C after flowering film on rice kernel for 10 minutes is advancing wetting and activation of the said enzyme, and then from inactivation. The yield of yellowish rice grains may be from 1 to 3% Under the influence of superheated steam with a temperature of 150 ^{° C} for 3 min yellowed rice grains in the rump practically no. Heating more than 150 ^о С contributes to the increase in fracturing of rice grains (see table. 1).

 Drying of flower films, for example by pulsed drying, promotes effective peeling of rice grains without cooling to ambient temperature.

Shelled rice at a temperature of 100 ^{° C} was subjected to steaming (saturated steam treatment) at a temperature of 120-130 ^C for 5-10 min (see. Table. 2).

Steaming at a temperature less than 120 ^{° C} for 5 minutes, lowering the temperature may cereals rice grains communicated to them due to thermal shock; as a result, the process of gelatinization of starch in the core is disrupted, which affects the output of the whole kernel.

At temperatures over 130 ^{° C} is also not a process of starch gelatinization due to high temperature, which also affects the output of the whole kernel. The steamed core is dried at the same temperature of the drying agent, i.e. 120-130 ° ^C. Dry to a moisture content 15,0-15,5% then cooled to 18-25 ^{° C,} i.e. to ambient temperature, and sent for grinding.

The method is as follows: purified from impurities, the grain of rice is placed in water heated to a temperature of 100 ^about C, and boiled for 3-10 minutes or subjected to treatment with superheated steam at 100-150 ^about C for 3-5 minutes, then dried and carried out peeling of grain. The resulting flaking kernel rice grains are steamed at a temperature of 120-130 ^C for 5-10 minutes, then dried to a moisture content 15,0-15,5% was cooled to 18-25 ^{° C} and passed to grinding.

EXAMPLE EXAMPLE 1 10 kg Not peeled rice grains were placed for 10 minutes in water at 95 ° ^C. Then dry film flowering and separated them from the core. The content of yellowed grains was 0.7%. Croup was unsatisfactory according to organoleptic evaluation.

 PRI me R 2. 10 kg of unshelled rice grains were boiled for 2 minutes. Then the flower films were dried and separated from the core. There were many yellowed grains. The content of yellowed grains was 1.5%. Croup had an unsatisfactory organoleptic rating.

PRI me R 3. 10 kg of unshelled rice grains were boiled for 3 minutes. Then dry the film flowering drying agent with a temperature of 100 ^{° C,} peeled, steamed at 125 ^{° C} with saturated steam for 8 minutes. The yield of whole cereals was 58.4% of grain crushed 15.2% of yellowed grains was 0.2%
PRI me R 4. 10 kg of unshelled rice grains were boiled for 10 minutes Then dry the film flowering drying agent with a temperature of 100 ^{° C,} peeled, steamed at ¹²⁰ ° C with saturated steam for 10 minutes. Flower films separated easily. The yield of whole cereals was 57.4% of the grain, the yield of crushed cereals 16.2% There were no yellowing grains.

EXAMPLE EXAMPLE 5 10 kg Not peeled rice grains were treated with superheated steam at 130 ^{° C} for 3 minutes and then dry the impulse drying flowering film. They easily exfoliated. Bare core steamed for 15 minutes with saturated steam at 130 ^C. The yield amounted whole cereal grain to 57.3%, 16.0% crushed was not yellowed grains.

PRI me R 6. 10 kg of unshelled rice grains were treated with superheated steam with a temperature of 155 ^about C for 2 minutes Flower films were dried and easily peeled off. Among the exposed kernels there were units of darkened (brown) grains, as if slightly burnt. After steaming with saturated steam at a temperature of 135 ^{° C} for 3 min whole cereal yield was 51.2% of the grain, 19.1% crushed therefore use superheated steam at 155 ^{° C} for the hydrothermal treatment of rice grains are not advisable before peeling, t since this regime does not provide a significant improvement in the quality of cereals and an increase in the yield of whole cereals, at the same time it requires more energy for heating steam.

PRI me R 7. 10 kg of unshelled rice grains were boiled for 15 minutes As a result, almost complete gelatinization of starch in grains took place, they swelled, dried flower films did not separate well. There were no yellowed grains. After steaming with saturated steam at a temperature of 115 ^{° C} for 15 minutes gave yield 52.4% whole grains to grain, yield 18.9% regrind Such hydrothermal treatment regime applied impractical because and shorter boiling time (3-10 min) eliminates the yellowing of the grains of rice, while ensuring a higher yield of whole cereals.

Claims (2)

1. METHOD FOR PROCESSING RICE GRAIN IN A CIRCUIT, providing for hydrothermal processing of grain and drying, peeling and grinding of the kernel, characterized in that the hydrothermal treatment is carried out by boiling for 3 to 10 minutes or superheated steam at 100 150 ^o C for 3 to 5 minutes, and drying is carried out to remove moisture from the flower films. 2. The method according to claim 1, characterized in that after peeling, the kernels are further steamed at 120 130 ^o C for 5 10 minutes, followed by drying to a moisture content of 15 15.5% and cooling.

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