In vitro release kinetics and physical, chemical and mechanical characterization of a POVIAC®/CaCO3/HAP-200 composite.
Coralline calcium-hydroxyapatite and calcium carbonate from Porites Porites coral were added to a polymeric matrix based on polyvinyl acetate (POVIAC(®)), to obtain a novel bone substitute composite as well as a system for the controlled drug (cephalexin) release. Composite samples with different compositions were characterized by physical-chemical and mechanical methods. Furthermore, the in vitro release profile of cephalexin and the kinetic behavior of its release from these composites were analyzed by appropriate mathematical models. It was shown that there is no chemical interaction between the inorganic filler and the polymer matrix, each conserving the original properties of the raw materials. The compressive mechanical strength and Young modulus of the composite with 17.5% of POVIAC(®), has better mechanical properties than those of cancellous bone. The variation of POVIAC(®) content can affect the cephalexin release kinetic in the composite. The cephalexin release mechanism from the composites can be considered as the result of the joint contribution of a prevailing Fickian diffusion and of polymer chain relaxation. It was also demonstrated that cephalexin is occluded inside the composites and not on their surface.
National Center for Scientific Research, Havana, Cuba. javier.aragon@cnic.edu.cu
Javier
J
Aragón
Ramón
R
González
Gastón
G
Fuentes
Luca
L
Palin
Gianluca
G
Croce
Davide
D
Viterbo
D000818:Animals; D037421:Anthozoa; D018786:Bone Substitutes / Q000737:chemistry; D002119:Calcium Carbonate / Q000737:chemistry; D002506:Cephalexin / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D019245:Compressive Strength; D004058:Diffusion; D017886:Durapatite / Q000737:chemistry; D006882:Hydroxyapatites / Q000737:chemistry*; D066298:In Vitro Techniques; D007700:Kinetics; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008962:Models, Theoretical; D016133:Polymerase Chain Reaction; D011145:Polyvinyls / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D014961:X-Ray Diffraction
D018786:Bone Substitutes; D006882:Hydroxyapatites; D011145:Polyvinyls; C119955:coralline hydroxyapatite; C013215:polyvinyl acetate; D017886:Durapatite; D002119:Calcium Carbonate; D002506:Cephalexin