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Hyaluronic acid is a polymer of disaccharides, which are composed of D-glucuronic acid and N-acetyl-D-glucosamine, linked via alternating β-(1→4) and β-(1→3) glycosidic bonds. Hyaluronic acid can be 25,000 disaccharide repeats in length. Polymers of hyaluronic acid can range in size from 5,000 to 20,000,000 Da in vivo.
Materials may swell, collapse, or change depending on the pH of their environment. This behavior is exhibited due to the presence of certain functional groups in the polymer chain. pH-sensitive materials can be either acidic or basic, responding to either basic or acidic pH values. These polymers can be designed with many different ...
Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.
Sodium hyaluronate is the sodium salt of hyaluronic acid.It is a glycosaminoglycan and long-chain polymer of disaccharide units of Na-glucuronate-N-acetylglucosamine. It can bind to specific receptors for which it has a high affinity.
Hyaluronic acid binds cells together, lubricates joints, and helps maintain the shape of the eyeballs. [19] The viscoelasticity of hyaluronic acid makes it ideal for lubricating joints and surfaces that move along each other, such as cartilage. A solution of hyaluronic acid under low shear stress has a much higher viscosity than while under ...
“Hyaluronic acid is a substance naturally found in the body that retains moisture and can hold up to one thousand times its weight in water,” says Celebrity hairstylist Marc Ballance points ...
Chain elongation, beginning from the GlcNAc primer, occurs with sequential addition of alternating UDP-GlcA and UDP-GlcNAc units to the reducing end of the growing chain. [19] Diagram of the mechanism of hyaluronan synthase. In each iteration of chain elongation, one active site domain is occupied by the existing UDP-hyaluronan chain.
In polymer science, the polymer chain or simply backbone of a polymer is the main chain of a polymer. Polymers are often classified according to the elements in the main chains. The character of the backbone, i.e. its flexibility, determines the properties of the polymer (such as the glass transition temperature).
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