Hyaluronic acid, also known as hyaluronic acid, has the molecular formula (CHNO)ₙ. It is a glycosaminoglycan composed of a disaccharide unit of D-glucuronic acid and N-acetylglucosamine, and is a high-molecular-weight polymer. 

With its unique molecular structure and physicochemical properties, it exhibits a variety of important physiological functions within the body. 

Structure: 

Hyaluronic acid is a long-chain polysaccharide composed of alternating N-acetylglucosamine and D-glucuronic acid units. 

D-glucuronic acid and N-acetylglucosamine are linked by a β-1,3-glycosidic bond, and the disaccharide units are linked by a β-1,4-glycosidic bond. 

Inside the body, the molecular weight of hyaluronic acid ranges from 5,000 to 20 million daltons. 

Main applications: 

Pharmaceutical field: As a bioactive drug with high clinical value, hyaluronic acid is widely used in various ophthalmic surgeries, such as intraocular lens implantation, corneal transplantation, and anti-glaucoma surgeries. 

At the same time, it can also be used to treat arthritis and accelerate wound healing. 

Cosmetics field: Hyaluronic acid plays a unique protective role for the skin in cosmetics. It can keep the skin moist, smooth, delicate, and supple, and has anti-wrinkle and anti-aging effects. 

The functions of beauty care and restoring the physiological functions of the skin. 

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