Facile Preparation of Highly Luminescent Nitrogen-Doped Carbonaceous Nanospheres and Potential Application in Intracellular Imaging of Quercetin

Abstract

Highly luminescent nitrogen-doped carbonaceous nanospheres (LNCNs) were synthesized by a one-pot hydrothermal reaction of β-cyclodextrin (β-CD) and branched polyethylenimine (BPEI). Both the N-doping and amino-functionalisation of LNCNs were achieved simultaneously. The prepared LNCNs display excellent properties such as high physical and chemical stability, excitation wavelength-independent emission, and high photoluminescence quantum yields. Importantly, the LNCNs exhibit a quenching of photoluminescence in the presence of quercetin (Qc) based on the simple static quenching mechanism, making it possible to quantify concentrations from 0.5 to 80 μg mL−1 with a detection limit of 0.21 μg mL−1. Furthermore, the LNCNs probe was further used for imaging Qc in living cells.

Polyurethane Aerogels Based on Cyclodextrins: High-Capacity Desiccants Regenerated at Room Temperature by Reducing the Relative Humidity of the Environment

“…On the other hand, the deconvoluted O 1s spectrum of α-CDPU-15 exhibited two absorptions, one at 532.17 eV and one at 530.62 eV; the first one was attributed to both the glycosidic C−O−C and the urethane oxygen (CO)O, while the second one to the urethane CO. 72,73 Finally, consistent with the solid-state 15 N NMR data, the N 1s XPS spectra showed just one symmetric peak at 398.66 eV that was assigned to urethane N. 74 In summary, αand β-CDPU-xx were highly branched polyurethanes with surfaces decorated with −NH(CO)O− groups.…”

Chlorine-doped MoS2 quantum dots embedded in a molecularly imprinted polymer for highly selective and sensitive optosensing of quercetin

“…This shi can be attributed to the interaction between the oxygen-containing groups of quercetin and the molybdenum (Mo) in Cl-MoS 2 QDs@SiO 2 @-MIP. 39 Additionally, Fig. 7(b) demonstrates a signicant overlap between the II band of quercetin and the excitation spectrum of Cl-MoS 2 QDs@SiO 2 @MIP, suggesting partial absorption of excitation light by quercetin.…”