Extraction Method Plays Critical Role in Antibacterial Activity of Propolis-Loaded Hydrogels

Extracted propolis has been used for a long time as a remedy. However, if the release rate of propolis isnot controlled, the efficacy is reduced. To overcome this issue, extracted propolis was added to a cryogen system. Propolis collected from southern Brazil was extracted using different methods and loaded at different concentrations into polyvinyl alcohol (PVA) and polyacrylic acid hydrogels as carrier systems. The material properties were investigated with a focus on the propolis release profiles and the cryogen antibacterial properties against 4 different bacteria namely: Staphylococcus aureus, Escherichia coli, Salmonella typhimurium, and Pseudomonas putida. Swelling studies indicated that the swelling of the hydrogel was inversely related to propolis content. In addition, propolis release studies indicated a decreased release rate with increased propolis loading. PVA and PVA/polyacrylic acid-loaded propolis were effective against all 4 bacteria studied. These results indicate that the efficacy of propolis can be enhanced by incorporation into hydrogel carrier systems and that hydrogels with higher concentrations of propolis can be considered for use as bactericide dressing.

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Extraction Method Plays Critical Role in Antibacterial Activity of Propolis-Loaded Hydrogels
Gabriel G. de Lima 1, Ronaldo O. de Souza 1, Aline D. Bozzi 1, Malgorzata A. Poplawska 1,
Declan M. Devine 1, 2, Michael J.D. Nugent 1, *
1 Materials Research Institute, Athlone Institute of Technology, Athlone, Ireland
2 Rehabilitation Medicine Centre, Mayo Clinic, Rochester, Minnesota 55902
Propolis-loaded hydrogels.pdf
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