Abstract
The aim of this study was to synthesize dual-functionalized poly(vinyl alcohol) (PVA)/poly(acrylic acid) (PAA) electrospun nanofibers with enzyme and copper ion (Cu(II)) for enhancing anti-biofouling activities. The PVA/PAA nanofibers were successfully synthesized by co-electrospinning (voltage = 17 kV; tip-to-collector distance = 15 cm) and cross-linked by heat treatment. The PVA/PAA nanofibers were functionalized through adsorbing Cu(II) onto the nanofibers to prepare the PVA/PAA-Cu(II) nanofibers. Three proteases (proteinase K, trypsin, and α-chymotrypsin) and a quorum quenching enzyme (acylase I) were tested for biofilm reduction that α-chymotrypsin effectively inhibited the biofilm formation and removed biofilms of Pseudomonas aeruginosa and Staphylococcus aureus. The PVA/PAA nanofibers were dual-functionalized with α-chymotrypsin and Cu(II) to obtain PVA/PAA-Cu(II)-α nanofibers. Degradation tests for extracellular polymeric substances (EPS) extracted from P. aeruginosa indicated that the PVA/PAA-Cu(II)-α nanofibers could degrade the EPS proteins up to 0.26 mg mL−1 for 300 min, which was higher than that of free α-chymotrypsin. For anti-biofouling tests, the log number of planktonic and sessile cells of P. aeruginosa was the lowest in the PVA/PAA-Cu(II)-α nanofibers. The anti-biofouling activities of the PVA/PAA-Cu(II)-α nanofibers could be attributed to the effects of both Cu(II) (killing planktonic and sessile cells) and α-chymotrypsin (degrading the EPS protein in biofilm).
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This work was supported by the National Research Foundation of Korea, funded by the Ministry of Education, Republic of Korea (Grant number 2017-081271).
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Park, JA., Lee, SC. & Kim, SB. Synthesis of dual-functionalized poly(vinyl alcohol)/poly(acrylic acid) electrospun nanofibers with enzyme and copper ion for enhancing anti-biofouling activities. J Mater Sci 54, 9969–9982 (2019). https://doi.org/10.1007/s10853-019-03578-6
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DOI: https://doi.org/10.1007/s10853-019-03578-6