Development of Gelatin Films with Designed Antimicrobial Peptide and Silver Nanoparticles

Development of Gelatin Films with Designed Antimicrobial Peptide and Silver Nanoparticles

Mohamed A. Abdalla (Department of Chemistry, Tuskegee University, Tuskegee, AL, USA), Hannah G. Harding (Department of Mechanical Engineering, Tuskegee University, Tuskegee, AL, USA), Temesgen Samuel (College of Veterinary-Medicine, Nursing & Allied Health, Tuskegee University, Tuskegee, AL, USA), Jesse Jayne (College of Agriculture, Environmental and Natural Sciences, Tuskegee University, Tuskegee, AL, USA) and Heshmat A. Aglan (Department of Mechanical Engineering, Tuskegee University, Tuskegee, AL, USA)
Copyright: © 2011 |Pages: 17
DOI: 10.4018/ijbre.2011070102
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Abstract

Gelatin films from cold water fish skin filled with designed antimicrobial peptide or silver nanoparticles were formulated for biomedical applications. Antibacterial activities of gelatin films containing silver nanoparticles and lytic peptides were evaluated to study the growth of a Staphylococcus species. The results suggest that inclusion of silver nanoparticles and lytic peptides into the composition of biocompatible films is feasible, with significant retention of the antimicrobial activity for both agents. The results presented here give evidence that both the silver nanoparticles and lytic peptides retain their antibacterial activity in such film matrices and the surrounding medium. Therefore, such biocompatible films may have potential use in biomedical applications such as wound dressing, superficial infection and contamination control. Evaluation of the mechanical properties for silver nanoparticles gelatin films revealed that the tensile strength appeared to be optimal at 0.3% silver nanoparticles loading. However, the strain-to-failure decreased with respect to the neat film.
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Introduction

Biodegradable materials research has become a very important area of study because of the critical need for environmentally friendly materials. Gelatin has been studied as a biodegradable polymer not only for its film forming properties but also for its availability and economical advantages over other synthetic biopolymers. Gelatin has been used in the food, pharmaceutical, biomedical, and photographic industries. In biomedical applications, gelatin has been developed for wound dressings, absorbent pads for surgical purposes, microspheres, and capsules (B. Chiou, Avena-Bustilos, R., Bechtel, P., Imam, S., Glenn, G., Orts, W., 2009; Gomez-Guillen, 2007; Rujitanaroj, 2008). Biowaste from the fishing industry has been reported to be 75% of the total weight of catches. Hence use of this material contributes greatly to environmental enhancement. Gelatin is a heterogeneous mixture of proteins extracted from mainly skin, tendons, ligaments, and bones (Choi, 1999). In a recent comparative study between bovine-hide and tuna-skin gelatin, the water solubility and the breaking force were similar for both types of gelatin, but the puncture deformation and water vapor permeability values were different (Gomez-Estaca, 2009). Mammalian gelatins are stronger, but fish gelatins are more elastic and able to become better deformable films, which is desirable for films in medical applications.

Typically Gelatin is solvent cast and made into films, scaffolds, electrospun mats, and coatings for implants. The effect of the gelatin concentration, addition of nanoclay, and drying temperatures on barrier and mechanical properties have been studied (B. Chiou, Avena-Bustilos, R., Bechtel, P., Imam, S., Glenn, G., Orts, W., 2009; Rao, 2007). Pure gelatin films have been successfully optimized in many studies with different plasticizers such as sorbitol and glycerol. Cao et al. reported that sorbitol increases the elongation at break while decreasing the tensile strength and elastic modulus in bovine gelatin films (Cao, 2009).Sorbitol decreases the thermal stability of gelatin films by affecting the protein-protein interactions. In a recent study, it has been determined that the best dressings for wound healing are transparent films, in terms of smooth epithelial cell growth and healing time (Mishra, 2008). These films were compared to xenografts, gauze, and calcium alginate dressings. The transparent films were found to be optimal in achieving fast, stable healing with reduced diabetic patient pain.

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