1, essential amino acids (essential amino acid): refers to the human body (or other vertebrates) can not synthesize or synthetic speed far from the needs of the body, must be supplied by food protein, these amino acids called essential amino acids. The required amount of essential amino acids in adults is about the 20%~37% of protein requirement.
There are 8 kinds of functions:
Lysine: Promote brain development, is the composition of liver and gall bladder, can promote fat metabolism, regulate pineal gland, mammary gland, corpus luteum and ovary, prevent cell degeneration;
Tryptophan: To promote the production of gastric juice and pancreatic juice;
Phenylalanine: Participate in the elimination of renal and bladder function loss;
Methionine (Methylthio): Participates in the composition of hemoglobin, tissue and serum, has the function of promoting spleen, pancreas and lymph;
Threonine: The function of transforming certain amino acids to achieve balance;
Isoleucine: Participates in the regulation and metabolism of thymus, spleen and the pituitary gland, and the General command of the lower part of the brain acts on the thyroid gland and the gonad;
Leucine: Action balance isoleucine; Valine: Acts on corpus luteum, mammary gland and ovary.
2, half essential amino acids and conditions essential amino acids:
Arginine: Compound preparation (Minnofen) made of arginine and cholic acid is an effective drug in the treatment of syphilis, viral jaundice and other diseases.
Histidine: Can be used as biochemical reagents and agents, but also for the treatment of heart disease, anemia, rheumatoid arthritis and other drugs. Although the human body can synthesize arginine and histidine, but usually can not meet the normal needs, it is also known as a half essential amino acids or conditions essential amino acids, in the early childhood period these two are essential amino acids. The need for essential amino acids decreased with age, with adults significantly lower than infants.
(In recent years, many materials and textbooks have included histidine in adult essential amino acid) 3. Non-essential amino acids (Nonessentialamino acid): Refers to the human (or other vertebrates) can be synthesized by simple precursors, do not need to obtain from the food of amino acids. such as glycine, alanine and other amino acids