title: Physical and degradation properties of PLGA scaffolds fabricated by salt fusion technique.
abstract: Tissue engineering scaffolds require a controlled pore size and interconnected pore structures to support the host tissue growth. In the present study, three dimensional (3D) hybrid scaffolds of poly lactic acid (PLA) and poly glycolic acid (PGA) were fabricated using solvent casting/particulate leaching. In this case, partially fused NaCl particles were used as porogen (200-300µ) to improve the overall porosity (≥90%) and internal texture of scaffolds. Differential scanning calorimeter (DSC) analysis of these porous scaffolds revealed a gradual reduction in glass transition temperature (Tg) (from 48°C to 42.5°C) with increase in hydrophilic PGA content. The potential applications of these scaffolds as implants were further tested for their biocompatibility and biodegradability in four simulated body fluid (SBF) types in vitro. Whereas, simulated body fluid (SBF) Type1 with the optimal amount of HCO3 (-) ions was found to be more appropriate and sensible for testing the bioactivity of scaffolds. Among three combinations of polymer scaffolds, sample B with a ratio of 75:25 of PLA: PGA showed greater stability in body fluids (pH 7.2) with an optimum degradation rate (9% to 12% approx). X-ray diffractogram also confirmed a thin layer of hydroxyapatite deposition over sample B with all SBF types in vitro.
authors.affiliation: Department of Biotechnology, National Institute of Technology, Warangal 506004, India;
authors.forename: Naveen Kumar
authors.initials: NK
authors.lastname: Mekala
authors.forename: Rama Raju
authors.initials: RR
authors.lastname: Baadhe
authors.forename: Sreenivasa Rao
authors.initials: SR
authors.lastname: Parcha
authors.forename: Prameela Devi
authors.initials: PD
authors.lastname: Yalavarthy
keywords: hydroxyapatite; poly (lactic-co-glycolic acid) scaffolds; polymer degradation; simulated body fluid; solvent immersion