Continued from the previous article Adhesion Mechanisms of Chitosan (1):
13. The spatial structure of chitosan molecules can fit with specific receptors on the surface of biological mucous membranes, achieving adhesion through receptor – ligand interactions.
There are some specific receptor molecules on the surface of biological mucous membranes. If the spatial structure of chitosan molecules matches these receptors, they can bind like ligands and receptors, specifically adhering to the mucous membrane surface.
14. The amino groups of chitosan can chemically react with sulfhydryl groups on the surface of biological mucous membranes to form disulfide bonds or other covalent bonds, enhancing the firmness of adhesion.
Sulfhydryl groups have a certain reactivity. The amino groups of chitosan can chemically react with sulfhydryl groups under appropriate conditions to form new chemical bonds. The formation of this covalent bond makes the connection between chitosan and the mucous membrane more stable, and the adhesion is more firm.
15. The adsorption of chitosan on the surface of biological mucous membranes will cause changes in the charge distribution on the mucous membrane surface, further promoting the electrostatic interaction between chitosan and the mucous membrane and enhancing adhesion.
Chitosan carries a positive charge. After being adsorbed on the mucous membrane surface, it will change the charge distribution on the mucous membrane surface, causing changes in local charge density and charge polarity. This change will enhance the electrostatic attraction between chitosan and the mucous membrane, thereby improving the adhesion effect.
16. The hydrophilicity of chitosan molecules enables them to form a hydrated layer on the surface of biological mucous membranes. This hydrated layer can interact with the mucous membrane surface through intermolecular van der Waals forces to achieve adhesion.
Van der Waals forces are a kind of weak intermolecular force that generally exists. The water molecules and chitosan molecules in the hydrated layer formed by chitosan on the mucous membrane surface will generate van der Waals forces with the molecules on the mucous membrane surface. Although this force is weak, it can achieve the adhesion of chitosan under the action of a large number of molecules.
17. Chitosan can bind to glycolipid molecules on the surface of biological mucous membranes through sugar – sugar interactions or other intermolecular forces, promoting adhesion.
Glycolipid molecules contain sugar groups, and there may also be some sugar groups or groups that can interact with sugars on chitosan molecules. They can bind together through sugar – sugar interactions (such as hydrogen bonds, van der Waals forces, etc.) and other intermolecular forces, so that chitosan can adhere to the mucous membrane surface containing glycolipids.
18. The molecular chains of chitosan will diffuse and penetrate on the surface of biological mucous membranes, entering the surface structure of the mucous membrane, and achieving adhesion through mechanical interlocking.
Chitosan molecules have a certain degree of fluidity. When in contact with biological mucous membranes, the molecular chains will diffuse and penetrate into the surface layer of the mucous membrane and embed into the structure of the mucous membrane, just like nails being driven into a wooden board, achieving the adhesion of chitosan on the mucous membrane through this mechanical interlocking effect.
19. Chitosan can bind to collagen molecules on the surface of biological mucous membranes through intermolecular interactions (such as hydrogen bonds, electrostatic interactions, etc.), enhancing adhesion performance.
Collagen is one of the important components of biological mucous membranes. Groups such as amino and hydroxyl groups on chitosan molecules can interact with corresponding groups on collagen molecules through intermolecular forces such as hydrogen bonds and electrostatic attraction, so that chitosan can attach to the mucous membrane regions containing collagen.
20. The presence of chitosan can regulate the ion concentration and ionic strength on the surface of biological mucous membranes, affecting the charge state and conformation of biological molecules on the mucous membrane surface, thus being beneficial to the adhesion of chitosan.
Ion concentration and ionic strength will affect the charge state and conformation of biological molecules. The addition of chitosan will change the ionic environment on the mucous membrane surface, making the biological molecules on the mucous membrane surface in a state more conducive to interacting with chitosan, such as changing the charge distribution to enhance electrostatic attraction or changing the conformation to increase the contact area between molecules, thereby promoting adhesion.
21. Chitosan molecules can interact with fibronectin on the surface of biological mucous membranes through specific binding sites to achieve adhesion.
Fibronectin is a glycoprotein present in biological mucous membranes and has specific binding sites. Certain structures or groups on chitosan molecules can specifically bind to these binding sites, just like two pieces of a jigsaw puzzle matching each other, so that chitosan can adhere to the mucous membrane surface containing fibronectin.
22. During the adsorption process of chitosan on the surface of biological mucous membranes, it will cause the aggregation of biological molecules on the mucous membrane surface, forming larger complexes and enhancing the adhesive force between chitosan and the mucous membrane.
When chitosan is adsorbed on the mucous membrane surface, it will promote the aggregation of some biological molecules (such as proteins, polysaccharides, etc.) on the mucous membrane surface to form larger complexes. The interaction between this complex and chitosan is enhanced, thereby improving the adhesive force between chitosan and the mucous membrane.
23. The amino groups of chitosan can chemically react with ester groups on the surface of biological mucous membranes to form covalent bonds such as amide bonds, making chitosan firmly adhere to the mucous membrane.
Amino groups and ester groups can chemically react under certain conditions to generate amide bonds. The formation of this covalent bond makes the connection between chitosan and the mucous membrane more stable and can effectively prevent chitosan from falling off the mucous membrane surface.
24. The polymer chains of chitosan can form a network structure through mutual entanglement and cross – linking. This network structure can wrap biological molecules on the surface of biological mucous membranes, enhancing the adhesion effect.
The polymer chains of chitosan will entangle with each other in solution and can undergo cross – linking reactions to form a network structure under appropriate conditions. This network structure is like a cage and can wrap biological molecules on the mucous membrane surface, increasing the binding force between chitosan and the mucous membrane.
For high-quality chitosan products that leverage these adhesion mechanisms, Tianya Chemical stands as a reliable manufacturer and supplier, committed to providing top-grade chitosan for various applications.
The article is to be continued. Please refer to the next article Adhesion Mechanisms of Chitosan (3).
