Background technology
Paddy is one of cereal important on the earth, and Chinese paddy ultimate production ranks first in the world, and accounts for 33% of Gross World Product, is about two times of India, ten times of Japan.The paddy whole body all is precious, the major product rice of paddy processing, and as the main nutrition source of basic energy that satisfies human body and nutritional needs, the food problem that solves 21 centurys 1,600,000,000 population for China is made huge contribution.But for a long time, China's paddy processing only is in a kind of elementary machining state of the people's of satisfying grain ration demand, and rice converted products structure is single, and the byproduct level of comprehensive utilization is low, and deep processing only accounts for 20%, well below developed country.
With crack rice, old rice, long-grained nonglutinous rice, polished rice or glutinous rice is as raw material, by Starch rice and the rice protein that micronizing and enzyme digestion reaction are developed into, Starch rice can further develop in industries such as food, daily use chemicals as a kind of starch product with special performance.Rice protein has abundant nutritive value, higher property digested and assimilated and hypoallergenic, can be used as the albumen supplement and be used for food, feed for pet etc., so not only can improve the comprehensive utilization value of rice processing and the economic benefit of grain-production, also can make grain-production go on eucyclic road.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of Starch rice and rice protein, gained Starch rice and rice protein product have the unique taste and the superiority of nutrition aspect.
Technical scheme of the present invention: will crack rice earlier, raw materials such as old rice, long-grained nonglutinous rice, polished rice or glutinous rice carry out just being ground into the rice meal, again the rice meal is carried out micronizing, add water, add Sumizyme MP and carry out enzyme digestion reaction, centrifugation, precipitation washes after drying with water and is Starch rice; Supernatant liquor heats the enzyme that goes out, and concentrated, spraying drying makes rice protein.
(1) crack rice, the pulverizing of raw material such as old rice, long-grained nonglutinous rice, polished rice or glutinous rice
Particle diameter after the raw material pulverizing is more little, and starch separates just thoroughly more with proteic, and albumen residual in the starch is few more.So the coarse reduction of raw material elder generation to be required the 80-100 eye mesh screen, and then micronizing, make the particle diameter of rice meal cross 180 eye mesh screens.
(2) ground rice enzyme digestion reaction
Solid-liquid ratio
The mass ratio of rice meal and water is controlled to be 1: 6-1: 8, though amount of water increases the separation efficiency that can improve Starch rice and rice protein, but also can increase the energy consumption of the consumption and the desiccation protein of enzyme simultaneously, therefore relatively more suitable solid-liquid ratio is 1: 6-1: 8, and accent pH is 7.5-8.5.
The temperature and time of enzyme reaction
The present invention adds 2709 Sumizyme MPs (20U/g), enzyme concentration 0.20-0.25g/100g rice meal, the optimal reactive temperature of enzyme is higher, is 50-55 ℃, but can't influence the character of Starch rice and rice protein, because also do not reach the temperature of starch pasting and protein denaturation.The prolongation reaction times helps the thorough and complete of enzyme reaction, but long meeting increase of reaction times production cost, so the enzyme reaction time of the present invention is 7-8 hour.Used Sumizyme MP is good with 2709 Sumizyme MPs (Shanghai China thing reaches Industrial Co., Ltd. and produces).
(3) centrifugation
Adopt link-suspended basket centrifuge the precipitation of the Starch rice after the enzyme reaction effectively can be separated with the albumen clear liquid, centrifugal condition is 3000r/min, 20min.
(4) water washing and precipitating gets Starch rice
The centrifugal precipitation that obtains is added water washing, and water consumption is controlled to be 3~4 times of raw material rice meal, washs 1~2 time, centrifugation again after stirring, the precipitation of washing after centrifugal is carried out air stream drying, and making moisture content is below 12%, and the product that obtains is Starch rice;
Washing can reduce protein residual in starch greatly, generally needs raw material 3-4 washing starch sedimentation doubly can make that proteinic residual quantity is reduced to below 0.5% in the starch product for 1-2 time, is up to state standards.
(5) handle supernatant liquor and get rice protein
After enzyme digestion reaction finishes, in order to stop the further effect of proteolytic enzyme, the residual enzyme activity enzyme that goes out is handled, supernatant liquor is warming up to 90 ℃, and keeps 5-10min.
With falling film type economic benefits and social benefits thickener supernatant liquor is concentrated, concentrated condition is temperature 60-65 ℃, makes its solid substance reach 20%-25%.Feed liquid after concentrating is then carried out spraying drying, and air outlet temperature is 85 ℃, and making moisture content is below 5%, and dried product is rice protein.
Beneficial effect of the present invention: the Starch rice purity height that adopts the inventive method to produce, the albumen residual quantity is a kind of starch product with multiple application approach less than 0.4%.The rice protein purity that obtains simultaneously is of high nutritive value more than 65%, can be used as nutritious supplementary and uses in food, feed for pet.The present invention is a fine example of rice development and use.
Embodiment
Embodiment 1
Learnt from else's experience micronizing, cross the 15kg ground rice of 180 mesh sieves, add entry 90L stirring and evenly mixing, be heated to 50 ℃, add 2709 Sumizyme MP 30g (20U/g), enzyme digestion reaction 8h, temperature of reaction is controlled at 50-55 ℃, carry out centrifugation behind the enzyme digestion reaction, precipitation with the 60L washing once obtains Starch rice 7kg behind the air stream drying, making moisture content is below 12%.Supernatant concentration to its solid substance is 20%-25%.Feed liquid after concentrating is then carried out spraying drying, obtains rice protein product 1.2kg, and making moisture content is below 5%.
Embodiment 2
Learnt from else's experience micronizing, cross the 15kg ground rice of 180 mesh sieves, add entry 120L stirring and evenly mixing, be heated to 55 ℃, add 2709 Sumizyme MP 37g (20U/g), enzyme digestion reaction 7h, temperature of reaction is controlled at 50-55 ℃, carry out centrifugation behind the enzyme digestion reaction, precipitation obtains Starch rice 7.5kg with 45L washing twice behind the air stream drying, making moisture content is below 12%.Supernatant concentration to its solid substance is 20%-25%.Feed liquid after concentrating is then carried out spraying drying, obtains rice protein product 1kg, and making moisture content is below 5%.