Optimising the shell thickness-to-radius ratio for the fabrication of oil-encapsulated polymeric microspheres

Yuan Gao, Ding Zhao, Ming Wei Chang, Zeeshan Ahmad, Jing Song Li

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Core-shell microspheres with controllable shell thickness-to-radius (T/. R) ratios were fabricated using coaxial electrospraying for hydrophobic drug delivery using Sudan Red (dye) as a model hydrophobic active. Systematic investigations were conducted to determine the effects of several parameters on the particle diameter, shell thickness, and structure. These included polymer concentration, flow rate, applied voltage, collection distance and needle-to-ground electrode distance. The resulting microspheres were characterized by SEM and optical microscopy, which showed spherical core-shell geometries with tunable particle diameters and T/. R ratios ranging from 30 to 70. μm and between 0.12 and 0.3, respectively. FTIR was used to assess material stability during the one-step preparation of microspheres. MTT assay and fluorescence microscopy indicated no significant effect on cell growth behavior over a 24 h period when assessed using variable particle concentrations (between 10. μg/ml and 10 mg/ml). In-vitro release of the oil-soluble dye exhibited a fast release onset followed by a sustained release which was controlled by changing particle size or T/. R ratio. The results indicate potential applications for core-shell encapsulation and controlled release of hydrophobic drugs using the materials and processes described.

Original languageEnglish
Pages (from-to)963-971
Number of pages9
JournalChemical Engineering Journal
Volume284
DOIs
Publication statusPublished - 25 Sep 2015

Fingerprint

Microspheres
Oils
shell
Fabrication
oil
Coloring Agents
Dyes
Grounding electrodes
Fluorescence microscopy
Cell growth
microscopy
dye
Drug delivery
Encapsulation
drug
Needles
Optical microscopy
Assays
Polymers
Particle size

Keywords

  • Biopolymer
  • Coaxial
  • Core-shell
  • Drug delivery
  • Electrospray

Cite this

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abstract = "Core-shell microspheres with controllable shell thickness-to-radius (T/. R) ratios were fabricated using coaxial electrospraying for hydrophobic drug delivery using Sudan Red (dye) as a model hydrophobic active. Systematic investigations were conducted to determine the effects of several parameters on the particle diameter, shell thickness, and structure. These included polymer concentration, flow rate, applied voltage, collection distance and needle-to-ground electrode distance. The resulting microspheres were characterized by SEM and optical microscopy, which showed spherical core-shell geometries with tunable particle diameters and T/. R ratios ranging from 30 to 70. μm and between 0.12 and 0.3, respectively. FTIR was used to assess material stability during the one-step preparation of microspheres. MTT assay and fluorescence microscopy indicated no significant effect on cell growth behavior over a 24 h period when assessed using variable particle concentrations (between 10. μg/ml and 10 mg/ml). In-vitro release of the oil-soluble dye exhibited a fast release onset followed by a sustained release which was controlled by changing particle size or T/. R ratio. The results indicate potential applications for core-shell encapsulation and controlled release of hydrophobic drugs using the materials and processes described.",
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Optimising the shell thickness-to-radius ratio for the fabrication of oil-encapsulated polymeric microspheres. / Gao, Yuan; Zhao, Ding; Chang, Ming Wei; Ahmad, Zeeshan; Li, Jing Song.

In: Chemical Engineering Journal, Vol. 284, 25.09.2015, p. 963-971.

Research output: Contribution to journalArticle

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