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Description of N-Acetylneuraminic acid :

                Acetyl-neuraminic acid is the most widely distributed sialic acid (n-acyl-neuraminic acid) in nature. It is mainly a component sugar of animal cell membrane or secretory glycoproteins, glycolipids or bacterial capsule substances. In glycoproteins or glycolipids, which are located at the non-reducing end of the glycoside chain due to the formation of the glycosidic bond by the ketogroup at position 2, their negative charge or characteristic chemical structure gives them various physiological specificities. Hydrolyzed enzymes that remove terminal n-acetylneuraminidase (neuraminidase) are widely distributed in nature, from viruses to animals. The role of this terminal acid sugar residue has been identified by treating the physiological changes in the activity of this enzyme. For example, this glycoresidue forms the binding site of the influenza virus in the cell membrane of the red blood cell and plays a major role in the mutual recognition of plasma glycoproteins and liver cells or in the recognition mechanism of circulatory pathways by lymphocytes.