As for peptides, there are accurate definitions in cell biology and molecular biology: two or more amino acids are covalently linked by peptide bonds to form natural active substances, which widely exist in nature and living organisms, and play an important role in the life process. Amino acids form polypeptides, which are large enough to contain more than 50 amino acids called proteins. Amino acids, polypeptides and proteins form various functions of the body. Peptides can be divided into dipeptides according to the number of amino acids they contain

(containing two amino acids), tripeptide (containing three amino acids), tetrapeptide

What is peptide? What are peptides and oligopeptides?

Peptide: the binding of two or more amino groups through a peptide bond (peptide bond: the condensation of the carboxyl group of one amino acid with the amino group of another amino acid to remove the amide bond formed by one molecule of water) The covalently linked polymer is a new kind of nutrition with the most active, easily absorbed and high physiological function, which lies between the macromolecular protein and amino acid. Generally, it is composed of L-type α - amino acids, also known as polypeptides. It is a kind of important active substance in organism. The product of incomplete protein hydrolysis is also peptide. According to the number of amino acids, the peptide is 2

Three and four are different, which are called dipeptides, tripeptides and tetrapeptides. Generally, they contain 10

The lower amino acids are called oligopeptides, and the polypeptides are more than 10 amino acids. They are all called peptides for short. The amino acids in the peptide chain are not free amino acids, because the amino and carboxyl groups in the peptide chain are combined out, so the amino acids in the peptide and protein molecules are called amino acid residues

residue）。 Only when the molecular weight is between 5000 and 180 can it be called "peptide". Molecular weight segment in

The peptide between 5000 and 3000 is called "Macropeptide"; the peptide with molecular weight between 3000 and 1000 is called

It is a "polypeptide". Those with a molecular weight range of 1000-180 are called "small peptide", "oligopeptide" and "oligopeptide", also known as small molecule active polypeptide, which is generally composed of 2-6 amino acids.

The study of peptides deepens the understanding of nature, opens a window for human to understand the world in many aspects of chemistry and biology, and makes people realize that peptides are one of the important material bases of life, and their functions involve all aspects of life process. Peptides affect many important physiological and biochemical functions in organism. As neurotransmitters, neuromodulators and hormones, peptides participate in receptor-mediated signal transduction. It is known that more than 100 kinds of active peptides play a role in central and peripheral nervous system, cardiovascular system, immune system and digestive system. Peptides also affect the information exchange between cells and participate in the information exchange through the interaction with receptors Many biochemical processes, such as metabolism, pain, regeneration and immune response.

With the development of peptide manufacturing technology, more and more expensive peptide products in the past have entered into people's daily life, especially in the field of cosmetics. Peptide has become one of the most important active ingredients in anti wrinkle and anti-aging, and has played an unparalleled role in removing eye bags and dark circles, whitening and promoting hair growth.

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Chengdu Shengnuo Biotechnology Co., Ltd. has "Chengdu polypeptide drug engineering technology research center" in Chengdu, mainly engaged in polypeptide, polypeptide drug and beauty peptide research. Our zero defect has passed the FDA certification, and now it has become the first-class professional peptide drug and product development, technology transfer, technical service and peptide drug industry in the scale production and export of China's parks.