Document Type : Original articles
Authors
1
Chemistry department , faculty of science, Damietta university
2
Department of Chemistry, Faculty of Science, Damietta University
3
Chemistry Department, Faculty of Science, Damietta University, Egypt
4
Department of Botany and Microbiology, Faculty of Science, Damietta University, New Damietta, Egypt.
Abstract
New biologically active polyurethane composites were prepared by surface modification of polyurethane foams with thiourea and benzaldehyde. The current work introduces an efficient antimicrobial composite of thiourea polyurethane foam/benzaldehyde (TPU/Benzaldehyde). The main techniques used for thiourea polyurethane foam/benzaldehyde composites identification were Infrared spectra, Ultraviolet-Visible spectra, bandgap energy, X-ray diffraction, Scanning electron microscopy, magnetic susceptibility, and pH of zero-point charge (PHZPC). Surface functions such as carboxylic, lactonic, and phenolic hydroxyl groups have been identified via Boehm titration. The chemical stability of TPU/Benzaldehyde was tested in diverse buffer solutions (pH: 2–14) and various organic solvents (e.g., CH3OH, CH3COCH3, C6H6, C6H5CH3, DMF, and DMSO). The weights of TPU/Benzaldehyde were unaffected, which confirm its chemical stability. TPU/Benzaldehyde was tested for antibacterial and antifungal activity against Gram-negative bacterium E. coli, Gram-positive bacterium B. cereus, and fungus A. niger. TPU/Benzaldehyde had higher inhibition zones against Gram-positive B. cereus than Gram-negative E. coli, with inhibition zones of 18±0.03 and 16±0.03 mm, respectively. Also, TPU/Benzaldehyde had higher antifungal action against A. niger, with inhibition zones of 20±0.24 mm, than the standard antifungal agent, Fluconazole (14±0.14 mm).
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