1, the definition of peptide "The amino group of an amino acid and the carboxyl group of another amino acid can be condensed into a peptide, the formed amide group is called peptide bond in protein chemistry. The amino acid molecule is the smallest, the protein is the largest, two or more amino acids dehydration condensation to form a number of peptide bonds to form a peptide chain, multiple peptide chains for multistage folding to form a protein molecule. 2, the type of peptide on the market to peptides up a lot of names such as: peptide, oligopeptide, polypeptide, oligopeptide, biological peptide, three-peptide, five-peptide can be distinguished by molecular weight and the number of amino acid links: The molecular weight segment of more than 10000 is called protein powder. The molecular weight segment between 5000 and 10000 is called large peptide. The molecular weight segment between 50 and 1000 is called small peptide, oligopeptide, oligopeptide, also known as small molecule active polypeptide. Biologists call peptides "amino acid chain", the small molecule active polypeptide collectively referred to as "bioactive peptide". Common peptides include Dipeptide, Tripeptide, and even Polypeptide, etc. Strictly speaking, a peptide with less than 20 amino acids is called a oligopeptide; a peptide with more than 20 amino acids is called a polypeptide, and a peptide is another name. According to two different amino acids arranged into dipeptides, three arranged into tripeptides, six arranged into hexapeptides, so there are a variety of different peptide names on the market, in fact, amino acids in different forms of arrangement and combination.Peptides have many effects on the physiological functions of the human body, including anti-oxidation, anti-inflammatory and so on. Because polypeptides are compounds formed by amino acids connected by peptide bonds, they are produced in the process of protein hydrolysis, and have a variety of forms such as immune active peptides, neuroactive peptides, cholesterol peptides, enzyme regulators (such as trypanotropic peptides), antibacterial peptides, anti-cancer peptides (such as tumor cell necrosis factor) and anti-AIDS peptides. If the content of polypeptides in the body is reduced, it will have an impact on human growth and development, immune regulation and metabolism. For children, if peptides are lacking, the rate of growth and development will slow down, or even stop growing, which in severe cases may lead to dwarfism. For adults or the elderly, if the body lacks peptides, it will lead to their own immunity, metabolic disorders, endocrine disorders and other problems, which is easy to cause a variety of diseases, such as insomnia, weight loss or edema. In addition, peptides can also act directly on the nervous system, so a lack of peptides can cause people to become slow and no longer smart. The most serious is that if the peptide is reduced, it may cause the gradual appearance of comprehensive aging in various parts of the human body, resulting in various diseases. To sum up, polypeptides play an extremely important role in human health, and a reasonable balance of their content is crucial to maintaining human life activities.

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