Delivery of the antibiotic gentamicin sulphate from precipitation cast matrices of polycaprolactone

Chang, H.-I., Perrie, Y. and Coombes, A.G.A. (2006). Delivery of the antibiotic gentamicin sulphate from precipitation cast matrices of polycaprolactone. Journal of Controlled Release, 110 (2), pp. 414-421.


Microporous, poly(ε-caprolactone) (PCL) matrices were loaded with the aminoglycoside antibiotic, gentamicin sulphate (GS) using the precipitation casting technique by suspension of powder in the PCL solution prior to casting. Improvements in drug loading from 1.8% to 6.7% w/w and distribution in the matrices were obtained by pre-cooling the suspension to 4°C. Gradual release of approximately 80% of the GS content occurred over 11 weeks in PBS at 37°C and low amounts of antibiotic were measured up to 20 weeks. The kinetics of release could be described effectively by the Higuchi model with the diffusion rate constant (D) increasing from of 1.7 to 5.1 μg/mg matrix/day0.5 as the drug loading increased from 1.4% to 8.3% w/w. GS-loaded PCL matrices retained anti-bacterial activity after immersion in PBS at 37°C over 14 days as demonstrated by inhibition of growth of S. epidermidis in culture. These findings recommend further investigation of precipitation-cast PCL matrices for delivery of hydrophilic molecules such as anti-bacterial agents from implanted, inserted or topical devices. © 2005 Elsevier B.V. All rights reserved.

Publication DOI:
Divisions: Life & Health Sciences > Pharmacy
Life & Health Sciences
Life & Health Sciences > Applied Health Research Group
Life & Health Sciences > Health Sciences
Related URLs:
Uncontrolled Keywords: antibiotics,infection control,microporous,polycaprolactone,Pharmaceutical Science
Published Date: 2006-01-10


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