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Rice protein powder refers to the powdery material formed by the protein extracted from rice after powder distillation, purification, drying and other processing.
Rice protein powder is an important product of rice deep processing. According to its protein content and solubility, it can be divided into feed grade rice protein powder, edible grade rice protein powder and rice protein peptide.
Rice protein is mainly composed of albumin, globulin, alcohol soluble protein and glutenin. Rice protein has reasonable amino acid composition and high amino acid content. It is recognized as a high-quality edible protein. Rice protein powder has broad prospects for developing into infant food and high-end food because of its high nutritional value and low allergy.
1. Bioactive peptides of rice protein
2. Nutritional supplements
3. Food additives
4. Edible film
Rice protein has excellent nutritional quality and is recognized as the high-quality plant protein in cereal protein. According to Osborne classification method, rice protein can be roughly divided into four categories: albumin, soluble in water protein, accounting for 2%~5% of the total; Globulins, soluble in 0.5mol/L NaCl solution, accounting for 2%~10% of the total; Glutelin, soluble in dilute acid or alkali, accounts for more than 80% of the total; Prolamins, soluble in 70% - 80% ethanol solution, accounts for 1% - 5% of the total. Glutenin and gliadin become storage proteins, which are the main components of rice protein. However, the content of albumin and globulin is low, which is the physiological active protein in rice. Rice protein has good nutritional value because of its higher lysine content, higher essential amino acid content and higher biological value (BV) and protein utility ratio (PER).
1. Extract protein from rice
The purpose of rice protein extraction is to obtain high-purity rice protein products, which are generally divided into rice protein concentrate (RPC, protein content 50%~89%) and rice protein isolate (RPI, protein content more than 90%). Raw materials such as broken rice, rice grains and rice bran can be used to prepare rice protein. From the perspective of research progress at home and abroad, rice protein extraction methods mainly include alkali extraction, enzymatic extraction, solvent extraction, physical separation and compound extraction.
2. Separation and washing
The coarse matter of rice protein contains impurities such as starch, disaccharide, monosaccharide and cellulose, which need to be further purified. The following procedures take enzymatic extraction as an example.
Centrifuge the enzymolysis solution obtained in the previous procedure for 5-15min at the speed of 2000-4000rpm, and wash the solid phase obtained with the same amount of water as the enzymolysis solution for 3-5 times to collect and wash the solid phase. The liquid phase contains nutrients such as glucose, which can be used to produce feed yeast (single cell protein).
The function of separation and washing is to remove non-protein impurities in materials.
3. Enzymatic sterilization
Add an appropriate amount of water to the washing solid obtained in the previous procedure to make the solid content reach 16 - 17% (weight percentage), and then boil the feed liquid for 30 minutes, or treat it for 4 - 6 seconds at ultra-high temperature at 115-121 ℃, and then carry out high-temperature treatment and enzyme sterilization.
4. spray drying
The feed liquid obtained in the previous process is dried through a spray dryer to obtain high-purity rice protein powder. The inlet air temperature of spray drying is 165-180 ℃, the outlet air temperature is 75-85 ℃, and the spray pressure is greater than 0.7MPa. With this process, the protein extraction rate is more than 80%, the dry weight percentage of the obtained high-purity soluble rice protein powder is more than 80%, the fat weight percentage is less than 3%, and the ash weight percentage is less than 3%. The high-purity soluble rice protein powder has a wide range of uses, and can be used in food, cosmetics, medicine and other industries.
Rice protein powder refers to the powdery material formed by the protein extracted from rice after powder distillation, purification, drying and other processing.
Rice protein powder is an important product of rice deep processing. According to its protein content and solubility, it can be divided into feed grade rice protein powder, edible grade rice protein powder and rice protein peptide.
Rice protein is mainly composed of albumin, globulin, alcohol soluble protein and glutenin. Rice protein has reasonable amino acid composition and high amino acid content. It is recognized as a high-quality edible protein. Rice protein powder has broad prospects for developing into infant food and high-end food because of its high nutritional value and low allergy.
1. Bioactive peptides of rice protein
2. Nutritional supplements
3. Food additives
4. Edible film
Rice protein has excellent nutritional quality and is recognized as the high-quality plant protein in cereal protein. According to Osborne classification method, rice protein can be roughly divided into four categories: albumin, soluble in water protein, accounting for 2%~5% of the total; Globulins, soluble in 0.5mol/L NaCl solution, accounting for 2%~10% of the total; Glutelin, soluble in dilute acid or alkali, accounts for more than 80% of the total; Prolamins, soluble in 70% - 80% ethanol solution, accounts for 1% - 5% of the total. Glutenin and gliadin become storage proteins, which are the main components of rice protein. However, the content of albumin and globulin is low, which is the physiological active protein in rice. Rice protein has good nutritional value because of its higher lysine content, higher essential amino acid content and higher biological value (BV) and protein utility ratio (PER).
1. Extract protein from rice
The purpose of rice protein extraction is to obtain high-purity rice protein products, which are generally divided into rice protein concentrate (RPC, protein content 50%~89%) and rice protein isolate (RPI, protein content more than 90%). Raw materials such as broken rice, rice grains and rice bran can be used to prepare rice protein. From the perspective of research progress at home and abroad, rice protein extraction methods mainly include alkali extraction, enzymatic extraction, solvent extraction, physical separation and compound extraction.
2. Separation and washing
The coarse matter of rice protein contains impurities such as starch, disaccharide, monosaccharide and cellulose, which need to be further purified. The following procedures take enzymatic extraction as an example.
Centrifuge the enzymolysis solution obtained in the previous procedure for 5-15min at the speed of 2000-4000rpm, and wash the solid phase obtained with the same amount of water as the enzymolysis solution for 3-5 times to collect and wash the solid phase. The liquid phase contains nutrients such as glucose, which can be used to produce feed yeast (single cell protein).
The function of separation and washing is to remove non-protein impurities in materials.
3. Enzymatic sterilization
Add an appropriate amount of water to the washing solid obtained in the previous procedure to make the solid content reach 16 - 17% (weight percentage), and then boil the feed liquid for 30 minutes, or treat it for 4 - 6 seconds at ultra-high temperature at 115-121 ℃, and then carry out high-temperature treatment and enzyme sterilization.
4. spray drying
The feed liquid obtained in the previous process is dried through a spray dryer to obtain high-purity rice protein powder. The inlet air temperature of spray drying is 165-180 ℃, the outlet air temperature is 75-85 ℃, and the spray pressure is greater than 0.7MPa. With this process, the protein extraction rate is more than 80%, the dry weight percentage of the obtained high-purity soluble rice protein powder is more than 80%, the fat weight percentage is less than 3%, and the ash weight percentage is less than 3%. The high-purity soluble rice protein powder has a wide range of uses, and can be used in food, cosmetics, medicine and other industries.
