Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 17, Pages 15427-15433Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5038643
Keywords
upconverting nanoparticles; enzymatic reactions; core-shell nanoparticles; upconversion; inner filter effect
Funding
- CSIC
- MINECO [CTQ2012-34774]
- DFG (Bonn, Germany) [WO-669/12-1]
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We report on upconverting luminescent nanoparticles (UCLNPs) that are spectrally tuned such that their emission matches the absorption bands of the two most important species associated with enzymatic redox reactions. The core-shell UCLNPs consist of a beta-NaYF4 core doped with Yb3+/Tm3+ ions and a shell of pure beta-NaYF4. Upon 980 nm excitation, they display emission bands peaking at 360 and 475 nm, which is a perfect match to the absorption bands of the enzyme cosubstrate NADH and the coenzyme FAD, respectively. By exploiting these spectral overlaps, we have designed fluorescent detection schemes for NADH and FAD that are based on the modulation of the emission intensities of UCLNPs by FAD and NADH via an inner filter effect.
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