10.1007/s40204-015-0039-x

Influence of the protocol of fibroin extraction on the antibiotic activities of the constructed composites

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  • Wafa I. Abdel-Fattah*1,
  • Nagwa Atwa2,
  • Ghareib W. Ali1,
  1. Biomaterials Department, National Research Centre, Cairo, EG
  2. Chemistry of Natural and Microbial Products Department, National Research Centre, Cairo, EG
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Published in Issue 2015-07-04

How to Cite

Abdel-Fattah, W. I., Atwa, N., & Ali, G. W. (2015). Influence of the protocol of fibroin extraction on the antibiotic activities of the constructed composites. Progress in Biomaterials, 4(2-4 (December 2015). https://doi.org/10.1007/s40204-015-0039-x
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Abstract

Abstract The effect of the solvents for silk fibroin (SF) extraction on its antimicrobial activity was studied. Extraction protocols were performed using LiBr (SF L ) and Ajisawa’s reagent (CaCl 2 :ethanol:H 2 O) (SF C ). The morphological and structural characteristics of the extracted SF and their composites were assessed. Corresponding bactericidal activities against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922) and Pseudomonas aeroginosa (ATCC 27853) were performed. The resulting solutions were either casted into films or individually incorporated into composites of silver nanoparticles (NS) embedded into chitosan fragments (Cs) through γ-irradiation. Films of SF, obtained by using the two solvents, as well as the final prepared composites of SF, NS and Cs were analyzed using XRD, FTIR, SEM, TEM and zeta potential at several pH values. The band gap values were calculated. The results proved that, although SF C consumed shorter gelation time, yet SF L exerted higher antibiotic activity against the tested microorganisms. Moreover, the final composites had the ability to significantly reduce the growth of these medically relevant bacteria and are, therefore, recommended as a novel natural antibacterial biomaterial for several biomedical applications.

Keywords

  • Silk fibroin,
  • Nanosilver,
  • FTIR-deconvolution,
  • Bactericidal activity,
  • Band gap
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