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NIR‐Emitting Gold Nanoclusters–Modified Gelatin Nanoparticles as a Bioimaging Agent in Tissue

El-Sayed, Nesma; Trouillet, Vanessa 1; Clasen, Anne; Jung, Gregor; Hollemeyer, Klaus; Schneider, Marc
1 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)


Gold nanocluster (AuNC) synthesis using a well‐distinguished polymer for nanoparticle‐mediated drug delivery paves the way for developing efficient theranostics based on pharmaceutically accepted materials. Gelatin‐stabilized AuNCs are synthesized and modified by glutathione for tuning the emission spectra. Addition of silver ions enhances the fluorescence, reaching also high quantum yield (26.7%). A simplified model can be proposed describing the nanoclusters' properties–structure relationship based on X‐ray photoelectron spectroscopy data and synthesis sequence. Furthermore, these modifications improve fluorescence stability toward pH changes and enzymatic degradation, offering different AuNCs for various applications. The impact of nanocluster formation on gelatin structure integrity is investigated by Fourier transform infrared spectrometry and matrix‐assisted laser desorption/ionization time of flight mass spectroscopy, being important to further formulate gelatin nanoparticles (GNPs). The 218 nm‐sized NPs show no cytotoxicity up to 600 µg mL−1 and are imaged in skin, as a challenging autofluorescent tissue, by confocal microscopy, when transcutaneously delivered using dissolving microneedles. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000100637
Veröffentlicht am 09.12.2019
DOI: 10.1002/adhm.201900993
Zitationen: 25
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2192-2640, 2192-2659
KITopen-ID: 1000100637
Erschienen in Advanced healthcare materials
Verlag Wiley-VCH Verlag
Band 8
Heft 24
Seiten Article: 1900993
Vorab online veröffentlicht am 26.11.2019
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