title: Hyaluronic acid auto-crosslinked polymer (ACP): Reaction monitoring, process investigation and hyaluronidase stability.
abstract: Hyaluronic Acid (HA) is a non-sulphated glycosaminoglycan that, despite its high molecular weight, is soluble in water and is not resistant to enzymatic degradation, the latter of which hinders its wider application as a biomedical material. Auto-crosslinked polymer (ACP) gels of HA are fully biocompatible hydrogels that exhibit improved viscoelastic properties and prolonged in vivo residence times compared to the native polymer. Crosslinking is achieved through a base-catalysed reaction consisting of the activation of HA carboxyl groups by 2-chloro-1-methylpyridinium iodide (CMPI) and subsequent nucleophilic acyl substitution by the hydroxyl groups of HA in organic solvent. In this study, a number of ACP hydrogels have been obtained via reactions using varying ratios of CMPI to HA. The crosslinking reaction was monitored by rheological measurements in organic solvents during CMPI addition to the reaction mixture. The ACP intermediates, powders and hydrogels were characterized, helping to elucidate the crosslinking process. A two-step mechanism was proposed to explain the observed trends in viscosity and particle size. Syntheses were carried out by varying the reaction temperature, respectively at 0 °C, 25 °C and 45 °C in N-Methyl-2-Pyrrolidone (NMP), as well as the solvent respectively in NMP, DMSO and DMF at 25 °C. Interestingly, varying these parameters did not substantially affect the degree of crosslinking but likely did influence the intra/inter-molecular crosslinking ratio and, therefore, the viscoelastic properties. A wide range of crosslinking densities was confirmed through ESEM analysis. Finally, a comparative hyaluronidase degradation assay revealed that the ACPs exhibited a higher resistance toward enzymatic cleavage at low elastic modulus compared to other more chemically resistant, crosslinked HAs. These observations demonstrated the importance of crosslinking density of matrix structures on substrate availability.
authors.affiliation: Fidia Farmaceutici S.p.A., via Ponte della Fabbrica 3/A, 35031 Abano Terme, PD, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Pluda
authors.affiliation: Fidia Farmaceutici S.p.A., via Ponte della Fabbrica 3/A, 35031 Abano Terme, PD, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Pavan
authors.affiliation: Fidia Farmaceutici S.p.A., via Ponte della Fabbrica 3/A, 35031 Abano Terme, PD, Italy.
authors.forename: Devis
authors.initials: D
authors.lastname: Galesso
authors.affiliation: Fidia Farmaceutici S.p.A., via Ponte della Fabbrica 3/A, 35031 Abano Terme, PD, Italy. Electronic address: cguarise@fidiapharma.it.
authors.forename: Cristian
authors.initials: C
authors.lastname: Guarise
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry; D001704:Biopolymers / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry; D006820:Hyaluronic Acid / Q000737:chemistry*; D006821:Hyaluronoglucosaminidase / Q000378:metabolism; D020100:Hydrogels / Q000138:chemical synthesis* / Q000737:chemistry; D010316:Particle Size; D011806:Quinolinium Compounds / Q000737:chemistry*; D012212:Rheology
chemical_list: C000607170:2-chloro-1-methylquinolinium; D001672:Biocompatible Materials; D001704:Biopolymers; D003432:Cross-Linking Reagents; D020100:Hydrogels; D011806:Quinolinium Compounds; D006820:Hyaluronic Acid; D006821:Hyaluronoglucosaminidase
keywords: Auto-crosslinked polymer (ACP); CMPI; Hyaluronan; Hyaluronidase