title: Moisture-activated rheological structuring of nonaqueous poloxamine-poly(acrylic acid) systems designed as novel biomedical implants.
abstract: This study reports the formulation/characterisation of novel polymeric platforms designed to behave as low-viscosity systems in the nonaqueous state, however, following uptake of aqueous fluids, exhibit rheological structuring and mucoadhesion. The rheological/mechanical and mucoadhesive properties of platforms containing poly(acrylic acid) (PAA, 1%, 3%, 5%, w/w) and poloxamines (Tetronic 904, 901, 704, 701, 304), both in the absence and presence of phosphate buffered saline (PBS, pH 7.4) are described. With the exception of Tetronic 904, all formulations exhibited Newtonian flow in the nonaqueous state, whereas, all aqueous formulations displayed pseudoplastic flow. The consistency and viscoelastic properties were dependent on the concentrations of PAA and PBS and Tetronic grade. PBS significantly increased the consistency, viscoelasticity and mucoadhesion, reaching a maximum at a defined concentration of PBS that was dependent on PAA concentration and Tetronic grade. Formulations containing Tetronic 904 exhibited greatest consistency and elasticity both prior to and after dilution with PBS. Increasing PAA concentration enhanced the mucoadhesive properties. Prolonged drug release of metronidazole was observed from formulations containing 10% (w/w) PBS, 3% and, particularly, 5% (w/w) PAA. It is suggested that the physicochemical properties of formulations containing 3% or 5% (w/w) PAA and Tetronic 904, would render them suitable platforms for administration to body cavities.
authors.affiliation: School of Pharmacy, The Queen's University of Belfast, Medical Biology Centre, 97, Lisburn Road, Belfast BT9 7BL, Northern Ireland, UK. d.jones@qub.ac.uk
authors.forename: David S
authors.initials: DS
authors.lastname: Jones
authors.forename: Brendan C O
authors.initials: BC
authors.lastname: Muldoon
authors.forename: A David
authors.initials: AD
authors.lastname: Woolfson
authors.forename: Gavin P
authors.initials: GP
authors.lastname: Andrews
authors.forename: Colin P
authors.initials: CP
authors.lastname: McCoy
authors.forename: F Dominic
authors.initials: FD
authors.lastname: Sanderson
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000268:Adhesiveness; D000890:Anti-Infective Agents / Q000008:administration & dosage; D003692:Delayed-Action Preparations / Q000737:chemistry; D004548:Elasticity; D005029:Ethylenediamines / Q000737:chemistry*; D008795:Metronidazole / Q000008:administration & dosage; D011092:Polyethylene Glycols / Q000737:chemistry*; D019736:Prostheses and Implants; D012212:Rheology; D055682:Viscoelastic Substances / Q000737:chemistry; D014783:Viscosity
chemical_list: D000180:Acrylic Resins; D000890:Anti-Infective Agents; D003692:Delayed-Action Preparations; D005029:Ethylenediamines; D055682:Viscoelastic Substances; D008795:Metronidazole; D011092:Polyethylene Glycols; C006903:carbopol 940