Highlights of this scientific book: Biosourced nanocomposite materials have been attracting increasing attention in recent years, making them of interest in biomedical research.Chitosan (CS) is one of the most widely used molecules in these structures, acting as a matrix. Our research has focused on this molecule, and on silver nanoparticles (in particular), as synergistic reinforcers of antibacterial activity. Despite this, we've also talked about other biopolymers and metallic antiseptic agents, and we've discussed the physical and chemical cross-links with the different states of matter, of these bionanocomposite networks. Parts of this book show other uses for bionanocomposites, such as therapeutic products, tissue engineering, food processing and chemical engineering in general