HA
Hyaluronic Acid
Glass Transition (Tg)
—
Melting Point (Tm)
— (decomposes)
Density
~1.8 g/cm³
CAS Number
9004-61-9
Recycling Code
None
Category
Natural
Repeat Unit
–[C₁₄H₂₁NO₁₁]ₙ– (β-1,4/β-1,3)
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Binds up to 1000× its weight in water; naturally present in synovial fluid and skin; molecular weight controls biological response.
Applications
Dermal fillers, viscosupplementation, eye surgery, cosmetics.