Abstract
Background: The re-emergence of infectious diseases and the increasing rate of the appearance of many antibiotic-resistant strains are major public health concerns. Zinc oxide nanoparticles (ZnO-NPs) have a great antibacterial effect. Few reports stated the antibacterial effect of low electric field (LEF).
Objective: The paper aimed to study the antibacterial effect of LEF at low frequency and investigate the antibacterial effectiveness of using LEF in synergy with ZnO-NPs.
Methods: Pseudomonas aeruginosa and Staphylococcus aureus were examined as models for Gramnegative and Gram-positive bacteria, respectively. The bacterial suspension was exposed to different concentrations of Zn-NPs ranging from 100-1600 μg/ml or 2 V/cm, 500 Hz AC electric field for 5 min. ZnO-NPs were prepared and characterized by UV-Vis spectroscopy, XRD, FTIR, TEM, and SEM. The combined effect of LEF exposure with each ZnO-NPs concentration was assessed.
Results: 1600 μg/ml ZnO-NPs cause 41.93% and 48.15% death, LEF produces 20.88% and 28.03% death, and the synergetic effect causes 50.41% and 70.27% death for P. aeruginosa and S. aureus, respectively. The death percentages were correlated with DNA concentration and deformation, reactive oxygen species concentration, and ultrastructure changes.
Conclusions: LEF has antibacterial properties and can be used in combination with ZnO-NPs to increase its lethal effect.
Keywords: Low electric field, ZnO nanoparticles, antimicrobial activity, DNA concentration and deformation, reactive oxygen species concentration, ultrastructure changes.
Graphical Abstract
[http://dx.doi.org/10.1053/jinf.1999.0624] [PMID: 10762105]
[http://dx.doi.org/10.1038/35023079] [PMID: 10984043]
[http://dx.doi.org/10.1590/0104-6632.20190362s20180027]
[http://dx.doi.org/10.1021/nn103320j] [PMID: 21517083]
[http://dx.doi.org/10.1021/acs.est.5b01841] [PMID: 26207769]
[http://dx.doi.org/10.1038/srep09578] [PMID: 25873247]
[http://dx.doi.org/10.1111/j.1365-2621.2002.tb11429.x]
[http://dx.doi.org/10.1186/s11671-018-2532-3] [PMID: 29740719]
[http://dx.doi.org/10.1016/j.yexcr.2004.03.027] [PMID: 15212939]
[http://dx.doi.org/10.1007/978-1-59745-429-2_10] [PMID: 19085126]
[http://dx.doi.org/10.15275/rusomj.2015.0203]
[http://dx.doi.org/10.1021/jp050745x] [PMID: 16852143]
[http://dx.doi.org/10.1002/1521-3773(20020402)41:7<1188:AID-ANIE1188>3.0.CO;2-5] [PMID: 12491255]
[http://dx.doi.org/10.1016/j.jtcme.2016.06.007] [PMID: 28417087]
[http://dx.doi.org/10.1016/j.jinorgbio.2017.09.014] [PMID: 28964993]
[http://dx.doi.org/10.1007/s00775-016-1339-x] [PMID: 26837748]
[http://dx.doi.org/10.3389/fmicb.2018.01218] [PMID: 29928271]
[http://dx.doi.org/10.1186/1556-276X-7-100] [PMID: 22296968]
[http://dx.doi.org/10.1016/j.nano.2014.02.012] [PMID: 24607937]
[http://dx.doi.org/10.2147/IJN.S45439] [PMID: 24109181]
[http://dx.doi.org/10.1128/AEM.01015-20] [PMID: 32561580]
[http://dx.doi.org/10.1099/00221287-70-2-263] [PMID: 4483215]
[http://dx.doi.org/10.1038/s41598-020-70169-w] [PMID: 32778787]
[http://dx.doi.org/10.21608/bvmj.2018.35946]
[http://dx.doi.org/10.1529/biophysj.104.051268] [PMID: 15556977]
[http://dx.doi.org/10.1371/journal.pone.0035204] [PMID: 22558127]
[http://dx.doi.org/10.4317/jced.55369] [PMID: 30697382]
[http://dx.doi.org/10.1016/j.ijantimicag.2016.11.011] [PMID: 28089172]
[http://dx.doi.org/10.1016/j.tibtech.2012.06.004] [PMID: 22884769]
[http://dx.doi.org/10.1088/2043-6254/aa92ba]
[http://dx.doi.org/10.1371/journal.pone.0222322] [PMID: 31518380]
[http://dx.doi.org/10.1111/j.1365-2672.2007.03374.x] [PMID: 17953548]
[http://dx.doi.org/10.1088/0268-1242/27/11/115016]