Biofilm formed from a tri-ureasil organic−inorganic hybrid gel for use as a cubebin release system
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In this work, we report the effects of catalyst amount on a tri-ureasil hybrid gel prepared by the sol−gel route, with the aim of controlling the film-forming time. Investigation of the key properties of biofilms produced from the hybrid gels revealed that varying the amount of acid catalyst could tune the film-forming time, without changing the structural features of the thin and transparent films. Independent of catalyst amount, springthe films presented low toxicity towards cells, indicating their suitability for use as new transdermal drug delivery systems. Due to the hydrophobic nature of the polyoxypropylene (PPO polyether chains) present in the hybrid films, very low water uptake was observed. This characteristic could be advantageous, since materials that show high swelling behavior can cause inflammatory responses in cells. The hybrid film with incorporation of a bioactive agent (cubebin, isolated from Piper cubeba seeds) was evaluated as a drug delivery system. Release of the drug from the matrix displayed a two-step pattern, kinetically controlled by (i) slow diffusion of cubebin molecules, and (ii) fast diffusive mass transport created by the solute−solvent interaction. The release of cubebin from the tri-ureasil hybrid film could be employed for radical scavenging and for the treatment of diseases such as cancer, leishmaniasis, and trypanosomiasis.
Tri-ureasil hybrid presents the film-forming properties in the fabrication of highly functional materials.
The biofilms showed remarkable hydrophobicity, transparency, flexibility, and easy processability.
The correlation between swelling assays and the wettability of the surface revealed key aspects of the release of a bioactive lignin.
Hybrid biofilms could be useful for trypanocidal, analgesic, anti-inflammatory, antimutagenic, and chemotherapeutic purposes.
A promising new platform for biofilm formation and as a vehicle for transdermal drug delivery system.
KeywordsTri-ureasil organic−inorganic hybrid Film-forming gel Cubebin Drug release
The authors are grateful for financial support provided by the Brazilian agencies CAPES, CNPq, and FAPESP (grants no. 2014/18876-2 and no. 2013/20455-2). We would like to thank Huntsman Performance Products for donating the Jeffamine® reagents, and Celso V. Santilli and Sandra H. Pulcinelli for allowing us to use their laboratory facilities (IQ-UNESP/Araraquara) during the contact angle measurements.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
This manuscript has not been published previously and is not under consideration for publication elsewhere. All co-authors have approved this version of the manuscript.
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