Molecular modifications, biological activities, and applications of chitosan and derivatives: A recent update

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Abstract
Polysaccharides arouse great interest due to their structure and unique properties, such as biocompatibility, biodegradability, and absence of toxicity. Polysaccharides from marine sources are particularly useful due to the wide variety of applications and biological activities. Chitosan, a deacetylated derivative of chitin, is an example of an interesting bioactive marine‐derived polysaccharide. Moreover, a wide variety of chemical modifications and conjugation of chitosan with other bioactive molecules are responsible for improvements in physicochemical properties and biological activities, expanding the range of applications. An overview of the synthetic approaches for preparing chitosan, chitosan derivatives, and conjugates is described and discussed. A recent update of the biological activities and applications in different research fields, mainly focused on the last 5 years, is presented, highlighting current trends.
Funding Information
  • Cooperativa de Ensino Superior Politécnico e Universitário (CHIRALSINTESE_APSFCT_IINFACTS_2021)
  • European Regional Development Fund (NORTE‐01‐0145‐FEDER‐000040)
  • Fundação para a Ciência e a Tecnologia (Base Funding UIDB/04423/2020 and UIDP/04423/2020, PTDC/CTA‐AMB/0853/2021, POCI‐01‐0145‐FEDER‐028736)

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