Time-Correlated Single Photon Counting For Simultaneous Monitoring ...
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Time-Correlated Single Photon Counting For Simultaneous Monitoring ...
Tell us about your experience on SpringerLink and you could win a MacBook Pro. Take survey. Download PDF · Pharmaceutical Research. November 2011 ...
Pharm Res (2011) 28:2920–2930 DOI 10.1007/s11095-011-0515-5
RESEARCH PAPER
Time-Correlated Single Photon Counting For Simultaneous Monitoring Of Zinc Oxide Nanoparticles And NAD(P)H In Intact And Barrier-Disrupted Volunteer Skin Lynlee L. Lin & Jeffrey E. Grice & Margaret K. Butler & Andrei V. Zvyagin & Wolfgang Becker & Thomas A. Robertson & H. Peter Soyer & Michael S. Roberts & Tarl W. Prow
Received: 2 February 2011 / Accepted: 15 June 2011 / Published online: 30 June 2011 # Springer Science+Business Media, LLC 2011
ABSTRACT Purpose There is a lack of relevant, non-animal alternatives for assessing exposure and toxicity of nanoparticle-containing cosmetics, e.g. sunscreens. Our goal was to evaluate timecorrelated single photon counting (TCSPC) for simultaneous monitoring of zinc oxide nanoparticles (ZnO-NP) and the metabolic state of volunteer skin. Methods We separated the fluorescence lifetime signatures of endogenous fluorophore signals (i.e. nicotinamide adenine dinucleotide phosphate, NAD(P)H and keratin) and the ZnO-NP signal using advanced TCSPC to simultaneously determine ZnO-NP penetration profiles and NAD(P)H changes in subjects with altered barrier function, including
tape-stripped skin and in psoriasis or atopic dermatitis lesions. Results We detected no ZnO-NP penetration into viable human skin in any group. ZnO-NP signal was significantly increased (p
