Application of Prussian blue coated nonwoven materials in bacterial detection
Objective The breeding and spread of bacteria on medical and hygienic materials are a major threat to human health.Therefore,it is of great significance to develop bacteria detective textile materials with high efficiency and performance.Prussian blue(PB)is a coordination compound with a redox potential high enough to react with proteins and mediators of the bacterial electron transport chain.Besides,it has a high extinction molar coefficient,distinct color change after reduction,which can be used as an indicator of bacterial reduction metabolism.Polypropylene(PP)spunbonded nonwovens have good chemical stability and are not easy to chemically react with Prussian blue or other substances tested,and the large surface area and pores of PP spunbonded nonwovens contribute to the loading of Prussian blue nanoparticles(PB NPs).In this paper,PP spunbonded nonwoven and PB NPs were employed as substrate and coating material respectively to prepare functional nonwoven with bacterial detection function by acoustic chemical coating technology.Method PB NPs were firstly prepared by using polyethylpyrrolidone and potassium ferricyanide as raw materials.Then,polyvinyl alcohol modified PP nonwoven(PP/PVA)was prepared by hydrophilic modification.As the last step,PB NPs were combined onto PP/PVA nonwoven by means of acoustic chemical coating technology to obtain PP/PB nonwoven.Scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and X-ray diffraction(XRD)were used to characterize the morphology,chemical and crystalline structures of PB NPs,PP,PP/PVA and PP/PB nonwovens.Especially,the bacterial detection performance of PP/PB nonwoven was evaluated by oscillating method.Results It was evident from the SEM image that the prepared PB NPs had a regular cubic structure with uniform particle size distribution.The fibers of pure PP nonwoven were arranged dandomly and the fiber surface was smooth and free of impurities,while obvious particles and network adhesion were found on the surface of PP/PVA nonwoven and PP/PB nonwoven,respectively.The infrared spectra of different samples showed that PP/PB nonwoven retained the characteristic absorption peaks of PP/PVA and PB NPs,indicating that PB NPs was successfully loaded on PP nonwoven.XRD patterns of different samples show that PP/PB nonwoven demopnstrated diffraction peaks of PP(2θ=14.18°,17.05°,18.64°,21.36° and 25.37°)and PB NPs(2θ=35.42°,39.76°,43.74°,50.95°,54.29° and 57.49°),implying that PB NPs were successfully loaded onto PP nonwoven by acoustic chemical coating technology.Finally,the bacterial detection performance of PP/PB nonwoven was investigated.With the increase of the concentration of PB NPs solution,the color of the solution gradually deepened.After 24 h of incubation in the bacterial solution containing Staphylococcus aureus and Escherichia coli,the color of the samples changed from blue to white,indicating that PP/PB nonwoven fabric could detect these bacteria through its color development reaction.Therefore,it is possible to applyPB NPs to medical and hygienic materials such as surgical gowns and masks to achieve the detection and early warning of bacteria through the color reaction,so as to effectively avoid adverse effects caused by bacteria.Conclusion The PP/PB nonwoven fabric with PB NPS coating were prepared by acoustic chemical coating technology,which has excellent bacterial detection performance.After inoculation with Staphylococcus aureus and Escherichia coli,the color of PP/PB nonwoven fabric changed from blue to white.It can be applied to medical care products such as surgical gowns and masks to realize the detection and early warning of bacteria through color reaction,so as to effectively avoid the adverse effects of bacteria.
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