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J. Funct. Biomater. 2018, 9(4), 56; https://doi.org/10.3390/jfb9040056

Development and Evaluation of an Injectable Chitosan/β-Glycerophosphate Paste as a Local Antibiotic Delivery System for Trauma Care

Department of Biomedical Engineering, University of Memphis, Memphis, TN 38152, USA
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Received: 29 August 2018 / Revised: 23 September 2018 / Accepted: 9 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Chitosan and Chitosan-Based Biomaterials)
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Abstract

Complex open musculoskeletal wounds are a leading cause of morbidity worldwide, partially due to a high risk of bacterial contamination. Local delivery systems may be used as adjunctive therapies to prevent infection, but they may be nondegradable, possess inadequate wound coverage, or migrate from the wound site. To address this issue, a thermo-responsive, injectable chitosan paste was fabricated by incorporating beta-glycerophosphate. The efficacy of thermo-paste as an adjunctive infection prevention tool was evaluated in terms of cytocompatibility, degradation, antibacterial, injectability, and inflammation properties. In vitro studies demonstrated thermo-paste may be loaded with amikacin and vancomycin and release inhibitory levels for at least 3 days. Further, approximately 60% of thermo-paste was enzymatically degraded within 7 days in vitro. The viability of cells exposed to thermo-paste exceeded ISO 10993-5 standards with approximately 73% relative viability of a control chitosan sponge. The ejection force of thermo-paste, approximately 20 N, was lower than previously studied paste formulations and within relevant clinical ejection force ranges. An in vivo murine biocompatibility study demonstrated that thermo-paste induced minimal inflammation after implantation for 7 days, similar to previously developed chitosan pastes. Results from these preliminary preclinical studies indicate that thermo-paste shows promise for further development as an antibiotic delivery system for infection prevention. View Full-Text
Keywords: chitosan; local antibiotic delivery; biofilm; complex musculoskeletal wounds; trauma care; injectable; in vivo evaluation; thermo-paste chitosan; local antibiotic delivery; biofilm; complex musculoskeletal wounds; trauma care; injectable; in vivo evaluation; thermo-paste
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Boles, L.; Alexander, C.; Pace, L.; Haggard, W.; Bumgardner, J.; Jennings, J. Development and Evaluation of an Injectable Chitosan/β-Glycerophosphate Paste as a Local Antibiotic Delivery System for Trauma Care. J. Funct. Biomater. 2018, 9, 56.

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