Deposition of PLA/CDHA composite coating via electrospraying.

Composite coatings composed of carbonated calcium deficient hydroxyapatite (CDHA) and polylactic acid (PLA) were deposited on a PLA substrate surface via electrospraying. The operation parameters, structural properties, bioactivity, cell adhesion, and growth capability of as-fabricated PLA/CDHA coatings were investigated. The composite coating showed good biocompatibility and bioactivity. The deposited coating was also applied as a carrier to assist alendronate sodium (AS) local release. AS, an approved bisphosphonate drug used for the treatment of osteoporosis, was incorporated into a composite coating matrix via coelectrospraying. Its release behavior showed a long-term sustained release. This approach can be a potential coating technique for the surface modification of biopolymer implants.