In this work, new chitosan derivatives (CS1-CS6) were obtained by short-term hydrothermal treatment. The formation of occurred through two simultaneous processes: hydrolysis and Maillard self-reaction. synthesized chitosan-based self-reaction products characterized physical measurements spectroscopic methods (viscometry, UV–Vis, FTIR, 1H NMR, TGA XRD). results showed that treatment solutions le...

Hydrogels based on polysaccharide and protein natural polymers are of great interest in biomedical applications and more specifically for tissue regeneration and drug delivery. Cellulose, chitosan (a chitin derivative), and collagen are probably the most important components since they are the most abundant natural polymers on earth (cellulose and chitin) and in the human body (collagen). Pepti...

Biopolymers are promising materials in the delivery of protein drugs due to their compatibility, degradation behavior, and nontoxic nature on administration. On suitable chemical modification, these polymers can provide better materials for drug delivery systems. Nanostructured drug carriers allow the delivery of not only small-molecule drugs but also of nucleic acids and proteins. The use of b...

Mara E.M. Braga a,∗, Maria T. Vaz Pato a, Hélio S.R. Costa Silva b, Elisabeth I. Ferreira b, Maria H. Gil a, Catarina M.M. Duarte c, Hermı́nio C. de Sousa a a Department of Chemical Engineering, University of Coimbra, Pólo II, Rua Sı́lvio Lima, 3030-790 Coimbra, Portugal b Faculdade de Ciências Farmacêuticas, USP, Av. Professor Lineu Prestes 580, Bloco 13, 05508-900 São Paulo, SP, Brazil c Nutrac...

Transient precursor states are often experimentally observed for molecules adsorbing on surfaces. However, such precursor states are typically rather short-lived, quickly yielding to more stable adsorption configurations. Here we employ first-principles calculations to systematically explore the interaction mechanism for benzene derivatives on metal surfaces, enabling us to selectively tune the...

Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have potential to remove various pollutants escaped into aquatic environment. Herein, development GO/chitosan (GO/CS) composites as adsorbent materials is described reviewed. This combination interesting addition chitosan enhances mechanical properties, wh...

Chitin and chitosan are biopolymers that frequently found in nature have a broad range of applications the food, biomedical industrial sectors, due to their high biological activity. The primary source chitin is shellfish, however, shortages supply chain, seasonality issues availability, as well ecological degradation only few problems with main resources. Due spectrum for which can be used, de...