Luminescent CeO2:Eu3+ nanocrystals for robust in situ H2O2 real-time detection in bacterial cell cultures

Henning, Dorian F.Karolinska Inst, Dept Microbiol Tumor & Cell Biol, SE-17177 Stockholm, Sweden;Imperial Coll London, Dept Comp, London, England (författare)

Hydrogen peroxide (H2O2) quantification in biomedicine is valuable as inflammation biomarker but also in assays employing enzymes that generate or consume H2O2 linked to a specific biomarker. Optical H2O2 detection is typically performed through peroxidase-coupled reactions utilizing organic dyes that suffer, however, from poor stability/reproducibility and also cannot be employed in situ in dynamic complex cell cultures to monitor H2O2 levels in real-time. Here, we utilize enzyme-mimetic CeO2 nanocrystals that are sensitive to H2O2 and study the effect of H2O2 presence on their electronic and luminescent properties. We produce and dope with Eu3+ these particles in a single-step by flame synthesis and directly deposit them on Si and glass substrates to fabricate nanoparticle layers to monitor in real-time and in situ the H2O2 concentrations generated by Streptococcus pneumoniae clinical isolates. Furthermore, the small CeO2:Eu3+ nanocrystals are combined in a single-step with larger, non-responsive Y2O3:Tb3+ nanoparticles during their double-nozzle flame synthesis to engineer hybrid luminescent nanoaggregates as ratiometric robust biosensors. We demonstrate the functionality of these biosensors by monitoring their response in the presence of a broad range of H2O2 concentrations in vitro from S. pneumoniae, highlighting their potential for facile real-time H2O2 detection in vitro in cell cultures.

Merkl, PadrykKarolinska Institutet (författare)
Yun, ChanghunKarolinska Inst, Dept Microbiol Tumor & Cell Biol, SE-17177 Stockholm, Sweden (författare)
Iovino, FedericoKarolinska Institutet (författare)
Xie, Ling,1982-Uppsala universitet,Tillämpad materialvetenskap(Swepub:uu)xieli203 (författare)
Mouzourakis, EleftheriosUniv Ioannina, Dept Phys, GR-45110 Ioannina, Greece (författare)
Moularas, ConstantinosUniv Ioannina, Dept Phys, GR-45110 Ioannina, Greece (författare)
Deligiannakis, YiannisUniv Ioannina, Dept Phys, GR-45110 Ioannina, Greece (författare)
Henriques-Normark, BirgittaKarolinska Institutet (författare)
Leifer, Klaus,1965-Uppsala universitet,Tillämpad materialvetenskap(Swepub:uu)kllei839 (författare)
Sotiriou, Georgios A.Karolinska Institutet (författare)
Karolinska InstitutetKarolinska Inst, Dept Microbiol Tumor & Cell Biol, SE-17177 Stockholm, Sweden;Imperial Coll London, Dept Comp, London, England (creator_code:org_t)

Ingår i:Biosensors & bioelectronics: ELSEVIER ADVANCED TECHNOLOGY132, s. 286-2930956-56631873-4235

Av författaren/redakt...: Henning, Dorian ...; Merkl, Padryk; Yun, Changhun; Iovino, Federico; Xie, Ling, 1982-; Mouzourakis, Ele ...; visa fler...; Moularas, Consta ...; Deligiannakis, Y ...; Henriques-Normar ...; Leifer, Klaus, 1 ...; Sotiriou, Georgi ...; visa färre...

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