The name of each of the 20 amino acids that make up human proteins

There are 20 kinds of basic amino acids known, including lysine, threonine, leucine, isoleucine, valine, methionine, tryptophan, phenylalanine 8 kinds of amino acids, the body can not make themselves, we call them necessary amino acids, need to be provided by food. In addition, the body’s ability to synthesize arginine and histidine is not enough to meet its own needs, so it needs to take part of them from food, which we call semi-essential amino acids. The rest of the ten amino acids that the body can make itself are called non-essential amino acids.

Amino acids are the basic building blocks of protein. There are about 200 kinds of amino acids, but there are only 20 kinds of amino acids that play an important role in animal nutrition and are widely recognized. They are called standard amino acids. According to the nutritional needs of animals for amino acids, it is usually divided into essential amino acids and non-essential amino acids. Essential amino acids refer to a class of amino acids that must be provided by feed because animals cannot synthesize the standard amino acids themselves, or the rate or quantity of synthesis cannot meet the needs of normal growth of animals. Nonessential amino acids are not necessary amino acids, but a class of amino acids that animals can synthesize or require in small quantities. The essential amino acids that need to be supplemented in the most amount in the diet are referred to as the first limiting amino acids, and those that are supplemented in the next amount are referred to as the second limiting amino acids.

Amino acid is one of the bioactive macromolecules in the construction of biological organism, and is the basic material for the construction of cells and the repair of tissues. Amino acids are used by the body to make antibody proteins to fight bacterial and viral infections, hemoglobin to transport oxygen, enzymes and hormones to maintain and regulate metabolism; Amino acid is the main material of producing sperm-egg cells and the indispensable prerequisite material of synthesizing neuromediators. Amino acids can provide energy for the body and brain activities, amino acids are the elements of all life