This paper reports a resonance energy transfer-amplifying fluorescence quenching at the surface of silica nanoparticles for the ultrasensitive detection of 2,4,6-trinitrotoluene (TNT) in solution and vapor environments. Fluorescence dye and organic amine were covalently modified onto the surface of silica nanoparticles to form a hybrid monolayer of dye fluorophores and amine ligands. The fluorescent silica particles can specifically bind TNT species by the charge-transfer complexing interaction between electron-rich amine ligands and electron-deficient aromatic rings. The resultant TNT−amine complexes bound at the silica surface can strongly suppress the fluorescence emission of the chosen dye by the fluorescence resonance energy transfer (FRET) from dye donor to the irradiative TNT−amine acceptor through intermolecular polar−polar interactions at spatial proximity. The quenching efficiency of the hybrid nanoparticles with TNT is greatly amplified by at least 10-fold that of the corresponding pure dye. The nanoparticle-assembled arrays on silicon wafer can sensitively detect down to ∼1 nM TNT with the use of only 10 μL of solution (∼2 pg TNT) and several ppb of TNT vapor in air. The simple FRET-based nanoparticle sensors reported here exhibit a high and stable fluorescence brightness, strong analyte affinity, and good assembly flexibility and can thus find many applications in the detection of ultratrace analytes.
Cucurbit[7]uril-conjugated dyes as live cell imaging probes: investigation on their cellular uptake and excretion pathways
作者:Meng Li、Ara Lee、Sungwan Kim、Annadka Shrinidhi、Kyeng Min Park、Kimoon Kim
DOI:10.1039/c9ob00356h
日期:——
The potential of cucurbit[7]uril derivatives as live cell imaging probes is demonstrated by investigating the intracellular uptake and excretion of dye-conjugated cucurbit[7]uril derivatives.
[EN] SYNTHESIS OF FOUR COLOR 3'-O-ALLYL MODIFIED PHOTOCLEAVABLE FLUORESCENT NUCLEOTIDES AND RELATED METHODS<br/>[FR] SYNTHESE DE NUCLEOTIDES FLUORESCENTS PHOTOCLIVABLES A MODIFICATION 3'-O-ALLYL EN QUADRICHROMIE ET PROCEDES ASSOCIES
申请人:UNIV COLUMBIA
公开号:WO2007053702A3
公开(公告)日:2008-01-24
[EN] METHOD OF SEQUENCING L-POLYNUCLEOTIDE<br/>[FR] PROCÉDÉ DE SÉQUENÇAGE DE L-POLYNUCLÉOTIDE
申请人:[en]DXOME INC.
公开号:WO2023183345A2
公开(公告)日:2023-09-28
The present disclosure provides a novel method of amplifying and sequencing L-form polynucleotide. Further provided include L-form nucleotides and D-form enzymes that can be used in the method. The method of making the L-form nucleotides and D-form enzymes are also provided.