Kateryna Loza

Dual pH-Responsive Calcium Phosphate Nanoparticles Conjugated with Folate by CuAAC Click Chemistry for Targeted Gemcitabine Delivery to Cancer Cells

Thales Rafael Machado, Aileen Winter, Kateryna Loza, Kathrin Kostka et autres

Calcium phosphate nanoparticles (CaP NPs) are biocompatible carriers widely studied for drug delivery due to their pH-responsive degradation and controlled release properties. In this study, CaP NPs stabilized with carboxymethyl cellulose (CMC) and coated with a silica layer were designed for gemcitabine …

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Insight into the Internal Structure of Biogenic, Synthetic and Geological Apatite by Electron Microscopy and X‐Ray Scattering

Kathrin Kostka, Oleg Prymak, Kateryna Loza, Matthias Epple

Abstract Calcium phosphate is the inorganic component (biomineral) of hard tissue, i.e., bone and teeth, of many higher organisms, including humans. Calcium phosphate is also synthetically prepared for biomedical application, usually as calcium phosphate ceramics for bone substitution and as calcium phosphate …

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Hybridization on DNA‐Coated Ultrasmall Gold Nanoparticles (2 nm)

Jonas Sager, Kateryna Loza, Oleg Prymak, Marc Heggen et autres

Ultrasmall gold nanoparticles were functionalized with covalently attached DNA strands of 20 or 30 nucleotides. This was achieved via click chemistry with alkyne-terminated DNA and azide-terminated gold nanoparticles. The particles were characterized by high-resolution transmission electron microscopy, UV-Vis spectroscopy, fluorescence spectroscopy, and …

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Localized Energy Absorption through LaB 6 Surface Modification of PA12 Enables Enhanced Tensile Performance in Diode Laser PBF‐LB

Nadine Stratmann, Michael Willeke, Simon Leupold, Kateryna Loza et autres

The shift to energy‐efficient near‐infrared (NIR) diode lasers in polymer powder bed fusion (PBF‐LB/P) challenges standard polymer powders due to insufficient NIR absorption and necessitates tailored feedstock modifications. This study explores the potential of surface modification (s‐mod) of polyamide 12 (PA12) with …

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Catalytic Activity of Water‐Dispersed Palladium Nanoparticles with Different Sizes and Shapes in the Semihydrogenation of Alkynes

Niklas Kost, Kateryna Loza, Marc Heggen, Thomas Seidensticker et autres

Abstract Palladium nanoparticles of different sizes and shapes dispersed in water, stabilized by either polyvinylpyrrolidone or glutathione, were studied in both monophasic and biphasic alkyne hydrogenation reactions at 50 bar hydrogen pressure. Spherical nanoparticles of 2 and 5 nm diameter as well …

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Synthesis and characterization of ultrasmall rhenium nanoparticles (1.5 nm)

Niklas Kost, Oleg Prymak, Kateryna Loza, Marc Heggen et autres

Abstract Ultrasmall rhenium nanoparticles were prepared by a reduction of rhenium trichloride with sodium borohydride in water capped with the tripeptide glutathione. The particles were approximately spherical with an average diameter of 1.5 nm and had a high degree of internal crystallinity …

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Temperature‐Resolved Fluorescence Quenching on Ultrasmall Gold Nanoparticles Conjugated with Dye‐Labeled Peptides

L Wagner, Alexander Huber, Kateryna Loza, Christine Beuck et autres

ABSTRACT Fluorescent peptides were covalently attached to the surface of ultrasmall gold nanoparticles (2 nm), that is, FITC‐AlaCys, FITC‐Ala‐Ala‐Ala‐Cys, and Trp‐Ala‐Cys (WAC). For comparison, the fluorescent dye AlexaFluor‐647 was attached to glutathione‐coated gold nanoparticles via click chemistry. Each particle carried between 10 …

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Synthesis and characterization of dodecylamine-capped ultrasmall metallic palladium nanoparticles (2 nm)

Niklas Kost, Oleg Prymak, Kateryna Loza, Christine Beuck et autres

C NMR spectroscopy in dispersion, revealing about 170 ligand molecules on the surface of each 2 nm particle. X-ray powder diffraction (Rietveld refinement) and total-scattering pair distribution function analysis (PDF) showed metallic palladium nanoparticles with a crystallite size of about 2 nm, …

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Conversion of Ultrasmall Glutathione-Coated Silver Nanoparticles during Dispersion in Water into Ultrasmall Silver Sulfide Nanoparticles

Natalie Wolff, Oleg Prymak, Nataniel Białas, Torsten Schaller et autres

Ultrasmall silver nanoparticles (2 nm) were prepared by reduction with sodium borohydride (NaBH4) and stabilized by the ligand glutathione (a tripeptide: glycine–cysteine–glutamic acid). NMR spectroscopy and optical spectroscopy (UV and fluorescence) revealed that these particles initially consist of silver nanoparticles and fluorescing …

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Oxidation state of ultrasmall dodecylamine-coated palladium nanoparticles probed by X-ray techniques

Niklas Kost, Oleg Prymak, Kateryna Loza, Marc Heggen et autres

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Structure elucidation of ultrasmall Au and Pd nanoparticles by X-ray techniques

Oleg Prymak, N. Kost, Kateryna Loza, Marc Heggen et autres

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The Molecular Footprint of Peptides on the Surface of Ultrasmall Gold Nanoparticles (2 nm) Is Governed by Steric Demand

L Wagner, Oleg Prymak, Torsten Schaller, Christine Beuck et autres

Ultrasmall gold nanoparticles were functionalized with peptides of two to seven amino acids that contained one cysteine molecule as anchor via a thiol–gold bond and a number of alanine residues as nonbinding amino acid. The cysteine was located either in the center …

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