Design of electrospayed non-spherical poly (L-lactide-co-glicolide) microdevices for sustained drug delivery.
Polymer chain entanglements in organic solvents can be considered a key parameter in the formation of non-spherical beads when electrospraying is employed. The shape of micro/nanometric drug delivery systems plays a major role since it can affect circulation, extravasation, distribution and in vivo clearance of the devices. In this frame, we investigated the influence of polymer processing parameters on the design of polylactic-co-glycolic acid non-spherical microdevices loaded with triamcinolone acetonide (TrA), a sparingly water soluble corticosteroid, prepared by electrospraying technique through a one-step process. In particular, we verified that the formation of non-spherical MDs is related to the presence of entanglements among polymer chains to select the optimal solution to be sprayed. The addition of TrA did not substantially affect the particle morphology in terms of size, size distribution and circularity at all the tested drug loadings. Furthermore, the drug could be released for a prolonged period, with controlled and reproducible kinetics for over 3 weeks. The mathematical modeling of release profiles highlighted that the release is mainly driven by degradation, at a higher extent in the case of low drug loading.
Dipartimento di Farmacia, Università di Napoli Federico II, Via D. Montesano 49, Naples, Italy.
Laura
L
Mayol
Assunta
A
Borzacchiello
Vincenzo
V
Guarino
Carla
C
Serri
Marco
M
Biondi
Luigi
L
Ambrosio
D016503:Drug Delivery Systems; D004867:Equipment Design; D019344:Lactic Acid / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer
D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid