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Rice protein is mainly composed of albumin, globulin, alcohol-soluble protein and gluten protein. Rice residue is mainly endosperm protein, which is composed of albumin (4% -9%), salt-soluble globulin (10% -11). %), Alcohol-soluble gluten (3%) and alkali-soluble gluten (66% -78%).

Rice protein

Among cereal protein, rice protein

1.1 Nutritional value

Rice protein quality is recognized

2.1 Solubility

Rice protein solubility is low, mainly because rice protein contains 75% ~ 90% alkali solubility

3.1 Alkali extraction [5]

Over 80% of rice protein is alkali soluble

4.1 Rice protein bioactive peptides [5]

Takahashi et al. Isolated and purified an oryzatensin active peptide from rice albumin trypsin hydrolysate, the amino acid sequence of which was GlyTyrRroMetTyrProLeuProArg. Anti-morphine and immunomodulatory activity. Rice protein contains a large number of hydrophobic amino acids. Enzymolysis at a specific site by a suitable protease will result in a peptide fragment containing a hydrophobic amino acid at the C-terminus, which is an angiotensin-converting enzyme (ACE) active peptide fragment. The ACE inhibitor is a main drug for treating hypertension, and the rice proteolytic active peptide has high safety and no side effects.

4.2 Nutritional supplements [6]

Aiming at infant sensitive diarrhea, rice protein is widely used to develop high protein and hypoallergenic infant formula rice powder due to its low antigenicity and high nutrition. Rice protein is gluten-free and suitable for people with wheat intolerance, allergies or celiac disease. Rice protein concentrate can also be used as a supplementary food for patients with reduced normal protein intake or impaired protein digestion to maintain nitrogen balance; it can also be used as an adjuvant therapy for osmotic diuretics, peptic ulcers, and trauma.

4.3 Food additives [6]

Enzyme treatment of rice bran protein has significantly improved solubility, foaming properties, emulsification properties, etc., especially with endoprotease and exoprotease for moderate hydrolysis and deamination of rice bran protein to obtain a moderate peptide chain length and function Characteristic protein hydrolysate, improve the solubility of rice bran protein, and improve other functional properties, can be used as food emulsifier, foaming agent, nutrition fortifier.

4.4 Edible film [5]

Southern Louisiana Research Center developed a edible film with a certain tensile strength and water vapor resistance by using a combination of rice protein concentrate and pullulan polysaccharides, as a carrier for flavor substances and nutritional additives, or for separation, protection and preservation Isolation. 4.5 Rice protein feed [6] Rice starch by-products can be used as feed-grade rice protein powder. Its rich nutritional ingredients can promote disease resistance for livestock and poultry, and can improve feed utilization.