Chapter 1. Chitosan and its Derivatives: a New Versatile Bio-polymer for Various Applications.- Chapter 2. Application of Chitosan in Oral Drug Delivery.- Chapter 3. Transdermal Delivery of Chitosan Based Systems.- Chapter 4 . Chitosan Based Ocular Drug Delivery systems.- Chapter 5. Functional Chitosan Carriers for Oral Colon-Specific Drug Delivery.- Chapter 6. Chitosan-based Hydrogels for Drug Delivery.- Chapter 7. Recent Advances of Chitosan based Systems for Delivery of Anticancer Drugs.- Chapter 8. Chitosan-based systems for Gene Delivery.- Chapter 9. Chitosan-based Interpenetrating Polymer Networks: Drug Delivery Application.- Chapter 10. Chitosan-based Systems in Tissue Engineering.- Chapter 11. Chitosan based Nanoformulation as Carriers of Small Molecules for Tissue Regeneration.- Chapter 12. Chitosan based Systems for Theranostic Applications.- Chapter 13. Grafted Chitosan Systems for Biomedical Applications.- Chapter 14. Chitosan-based Systems for Controlled Delivery of Antimicrobial Peptides for Biomedical Application.- Chapter 15. Antibacterial Activity of Chitosan based Systems.