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A nanoplatform concept was developed to synthesize accessible photoactive magnetic nanoparticles (MNPs) of FeO coated with silica. This approach was based on the covalent binding of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (TPPF) to aminopropyl-grafted MNPs by nucleophilic aromatic substitution reaction (SAr) to obtain conjugate MNP-P1. After modification, the remaining pentafluorophenyl groups of TPPF attached to MNPs were substituted by dimethylaminoethoxy groups to form MNP-P2. The basic amine group of these conjugates can be protonated in aqueous media. In addition, MNP-P1 and MNP-P2 were intrinsically charged to produce cationic conjugates MNP-P1 and MNP-P2 by methylation. All of them were easily purified by magnetic decantation in high yields. The average size of the MNPs was ∼15 nm, and the main difference between these conjugates was the greater coating with positive charges of MNP-P2, as shown by the zeta potential values. Absorption spectra exhibited the Soret and Q bands characteristic of TPPF linked to MNPs. Furthermore, these conjugates showed red fluorescence emission of porphyrin with quantum yields of 0.011-0.036. The photodynamic effect sensitized by the conjugates indicated the efficient formation of singlet molecular oxygen in different media, reaching quantum yield values of 0.17-0.34 in ,-dimethylformamide. The photodynamic activity of the conjugates was evaluated to inactivate the Gram-positive bacteria , the Gram-negative bacteria and the yeast . The modified cationic MNP-P2 was the most effective conjugate for photodynamic inactivation (PDI) of microorganisms. Binding of this conjugate to bacteria and photoinactivation capability was checked by means of fluorescence microscopy. Also, sustainable use by recycling was determined after three PDI treatments. Therefore, this methodology is a suitable scaffold for the modification of conjugates, and in particular, MNP-P2 represents a useful photodynamic active material to eradicate microorganisms.
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http://dx.doi.org/10.1021/acsabm.0c00625 | DOI Listing |
ACS Appl Mater Interfaces
December 2024
Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
Artificial photosynthesis of hydrogen peroxide (HO) from ambient air, water, and sunlight has attracted considerable attention recently. Despite being extremely challenging to synthesis, sp carbon-conjugated covalent organic frameworks (COFs) can be powerful and efficient materials for the photosynthesis of HO due to desirable properties. Herein, we report the designed synthesis of an sp carbon-conjugated COF, BTD-spc-COF, from benzothiadiazole and triazine units with high crystallinity and ultralarge mesopores (∼4 nm).
View Article and Find Full Text PDFFront Immunol
December 2024
Department of Microbiology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
The functional specialization of CD4 T lymphocytes into various subtypes, including T1 and T cells, is crucial for effective immune responses. T cells facilitate B cell differentiation within germinal centers, while T1 cells are vital for cell-mediated immunity against intracellular pathogens. Integrin α4, a cell surface adhesion molecule, plays significant roles in cell migration and co-stimulatory signaling.
View Article and Find Full Text PDFChem Sci
December 2024
Department of Chemistry, University of Warwick Coventry CV4 7AL UK
Self-assembling cyclic peptide nanotubes are fascinating supramolecular systems with promising potential for various applications, such as drug delivery, transmembrane ionic channels, and artificial light-harvesting systems. In this study, we present novel pH-responsive nanotubes based on asymmetric cyclic peptide-polymer conjugates. The pH response is introduced by a tertiary amine-based polymer, poly(dimethylamino ethyl methacrylate) (pDMAEMA) or poly(diethylamino ethyl methacrylate) (pDEAEMA) which is protonated at low pH.
View Article and Find Full Text PDFChem Sci
December 2024
Department of Chemistry, School of Science, Westlake University 310030 Hangzhou Zhejiang Province China.
Sulfonium is an electrophilic and biocompatible group that is widely applied in synthetic chemistry on small molecules. However, there have been few developments of peptide or protein-based sulfonium tools. We recently reported sulfonium-mediated tryptophan crosslinking and developed NleSme2 (norleucine-dimethylsulfonium) peptides as dimethyllysine mimics that crosslink site-specific methyllysine readers.
View Article and Find Full Text PDFChem Sci
December 2024
National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensor Technology and Health, College of Chemistry, Central China Normal University Wuhan 430079 P. R. China
Developing dithienylethene (DTE)-based fluorescence switches triggered by biocompatible visible light has always been a long-term goal in view of their potential in numerous biological scenarios. However, their practical availability is severely limited by the short visible light (generally less than 500 nm) required for photocyclization, their inability to achieve red or near-infrared emission, and their short fluorescence lifetimes. Herein, we present a novel DTE derivative featuring a dimethylamine-functionalized BF-curcuminoid moiety (NBDC) by using an "acceptor synergistic conjugation system" strategy.
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