Application of polydopamine functionalized magnetic graphene in triazole fungicides residue analysis

Berksun

ACS Appl. Polym. Mater.

et al. 2022

Hybrid waterborne polyurethane/polydopamine (WPU/PDA) matrix, showing the adhesive properties of PDA in its entirety, was utilized for the immobilization of lysostaphin (Lys), an important anti-staphylococcal agent, to obtain highly effective antibacterial and antibiofilm surface coatings. WPU/PDA matrix prepared by the encapsulation of WPU particles with PDA in aqueous dispersion was applied as coatings on substrates, and the facile incubation of the WPU/PDA-coated surfaces with Lys in aqueous solution resulted in WPU/PDA/Lys coatings that contained immobilized Lys on the surface. WPU/PDA/Lys coatings showed strong anti-Staphylococcus aureus activity with a 4 log reduction in the number of cells. Furthermore, WPU/PDA/Lys coatings were demonstrated to be durable without any enzyme leakage, and their antibacterial activity was preserved for at least 30 days and over multiple exposures to bacteria. WPU/PDA/Lys coatings presented significant antibiofilm activity against S. aureus with a 3.5 log reduction in the number of surface-attached bacteria. WPU/PDA/Lys coatings that are easy-to-apply to almost any surface, non-toxic, and environmentally friendly provide promising antibacterial and antibiofilm surfaces that are effective against S. aureus.

Section: Resultsmentioning

confidence: 69%

Lysostaphin-Functionalized Waterborne Polyurethane/Polydopamine Coatings Effective against S. Aureus Biofilms

Berksun

ACS Appl. Polym. Mater.

et al. 2022

ACS Appl. Mater. Interfaces

“…With the decoration of PDA, the contact area of the PDA-decorated filter tip increases. Besides, the electrostatic attraction and the π–π stacking interaction between the aromatic rings of PDA and the pyridine ring of nicotine may enhance the nicotine adsorption capacity by PDA. − In addition, PDA is rich in catechol and amino groups, which may produce hydrogen bonds and dipole–dipole interactions with the pyridine ring of nicotine . Therefore, the property of nicotine adsorption is improved significantly.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of a Functional Filter Tip for Highly Efficient Reduction of Nicotine Content in Mainstream Smoke

Lin

Yao

Wang

et al. 2021

The nicotine addiction problem is of great concern, particularly in adolescents. Notably, nicotine addiction drives humans to continue smoking. Notably, several diseases and disorders are caused by smoking. To date, various adsorbents have been proposed to develop a functionalization filter tip for reducing nicotine content in mainstream smoke. However, the nicotine adsorption efficiencies of most of the reported functionalization filter tips were not satisfactory, and their preparation process was complex and time-consuming. Herein, we demonstrate a highly active and adsorbing filter tip for cigarettes, fabricated by decorating polydopamine (PDA) on the surface of a commercial filter tip in situ. The PDA coating on the filter tip was obtained by the self-polymerization of dopamine (DA) within 16 h, which was quicker and easier than the preparation processes of other reported functionalized filter tips. Significantly, the PDA-decorated filter tip had a nicotine adsorption efficiency as high as ∼95%, which was much higher than most of the commercial filter tips.

J of Separation Science

“…These methods are based on the retention of the target analytes on sorbents, followed by desorption with organic solvents. The adsorbents involved in these methods included molecularly imprinted polymers [3,4], polymers [8,9], carbon nanotube [7,10], graphene [11], and metal oxide [12]. Noteworthily, the adsorbents play an important role during the extraction procedure.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the low amount of fungicide residues and the complexity of a real environmental sample, a proper sample preparation procedure for separating and enriching the targeted analytes from the sample matrix is generally required before chromatographic analysis. Several adsorbent-based extraction methods, characterized by easy operation, efficient extraction, and conservation of organic solvents, have previously been developed and applied to the fungicide sample pretreatment, such as SPE [3,4], SPME [5,6], dispersive-solid-phase extraction (d-SPE) [7], magnetic solid-phase extraction [8][9][10][11], and pipette extraction [12]. These methods are based on the retention of the target analytes on sorbents, followed by desorption with organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Defective Zr‐based metal–organic frameworks as sorbent for the determination of fungicides in environmental water samples by rapid dispersive micro‐solid‐phase extraction coupled to liquid chromatography/mass spectrometry

Zhang

Hua

Zhao

et al. 2021

In this work, defective Zr‐based metal–organic framework was successfully synthesized and evaluated as a dispersive micro‐solid‐phase extraction sorbent for efficient preconcentration and determination of fungicides in complex water samples. The defective Zr‐based metal–organic framework crystal with increased adsorption capacity was successfully synthesized by employing formic acid as the modulator. The extraction conditions, including the pH, extraction time, desorption solvent and desorption time, were comprehensively investigated. Under optimum conditions, it was found that dispersive micro‐solid‐phase extraction method, coupled with liquid chromatography/mass spectrometry, exhibited a good linear relationship with correlation coefficients greater than 0.9980. The relative standard deviations of inter‐day and intra‐day precisions ranged from 2.6 to 9.2% and the limits of detection ranged from 0.004 to 0.036 μg/L. These merits, combined with their satisfactory recoveries (>80%), suggested the great potential of defective Zr‐based metal–organic framework as a new adsorbent for efficient extraction of trace fungicides. This method exhibits good application potential for the pretreatment of fungicides from environmental water samples.