Search

Graphene quantum dots (GQDs) are synthesized by the method of high-temperature pyrolysis from marigold granules and subsequently nitrogen-doped graphene quantum dots (N-GQDs) are synthesized from ethylenediamine by hydrothermal treatment, which shows a strong blue emission with 7.84% quantum yield (QY). This will be used in detection of Fe3+ in water environments and the field of bioimaging. Unlabelled Image • In this method, N-GQDs were synthesized from marigold rich in lutein as carbon source. • The synthesized N-GQDs are only 3.2 nm in size. • The N-GQDs specifically identify Fe3+. • The N-GQDs can enter cells and have good biocompatibility and low toxicity. • This work can detect the concentration of Fe3+ in the Yellow River water. [ABSTRACT FROM AUTHOR]

A novel biphenyl-derived salicylhydrazone Schiff base ( BSS ) fluorescent probes for highly sensitive and selective identification of Cu 2+ has been synthesized. In addition, the recognition has been proved experimentally. The results indicated that the complex forms a 1:1 complex with Cu 2+ shows fluorescent quenching. Furthermore, the detection limit of 1.54 × 10 −8 M. More interesting, the probe BSS not only have a good biocompatibility in living cells, but also the sense behavior of Cu 2+ in the cell nucleus. [ABSTRACT FROM AUTHOR]

A new visual bis(salamo)-based fluorescent chemosensor for detection of B 4 O 7 2− in environmental and biological systems was synthesized for the first time by Schiff base reaction. The bright blue fluorescence of the sensor and B 4 O 7 2− was very obvious and the limit of detection for B 4 O 7 2− was as low as 6.97 × 10-10 M. Importantly, the first attempt of exogenous detection in zebrafish gained success. • H 6 L was explored for detecting B 4 O 7 2−. • It can be used for detection in zebrafish. A newly synthesized fluorescent chemosensor H 6 L was explored for detecting B 4 O 7 2−, characterized by 1H NMR spectrum, mass spectrum and fluorescence spectra. During the detection process of B 4 O 7 2−, the fluorescence is significantly enhanced and naked eye recognition can be performed under 365 nm UV light without any interference by other typical anions. The limit of detection is as low as 6.97 × 10-10 M. In addition, in order to broaden the application of salamo-based fluorescence sensors in the field of biology, except for the fluorescence imaging of HeLa cells, the first attempt of exogenous detection in zebrafish was conducted successfully. [ABSTRACT FROM AUTHOR]

A new sensor H 5 L for continuous identification of Cu2+, Al3+ and lysine was synthesized by Schiff base reactions. The sensor could specifically recognized Cu2+ in the EtOH/H 2 O (1:1 v /v) solution by UV–vis spectra, and the binding constant with Cu2+ can reach 1011 M−1, meanwhile, it was found by the naked-eye that the color of the solution was changed from colorless to yellow. The copper complex L-Cu 2+ formed by the sensor H 5 L and Cu2+ could further recognize Al3+ and lysine in the fluorescence spectra. The LOD values of the three objects were 2.67 × 10−8, 1.96 × 10−8 and 5.59 × 10−9 M, respectively. In addition, fluorescence intracellular images of Al3+ and lysine were performed and obtained satisfactory results. A novel salamo-like chemical sensor H 5 L for continuous recognition of Cu2+ and Al3+ and lysine was synthesized. The sensor can identify Cu2+ by UV–vis spectra and naked eye recognition. The formed copper(II) complex L-Cu 2+ can recognize Al3+ and lysine by fluorescence spectra, and good results of intracellular images were obtained. Unlabelled Image • A new bis(salamo)-based chemical sensor H 5 L for continuous recognition of Cu2+, Al3+ and lysine was synthesized. • H 5 L could recognize Cu2+ by UV-visible spectrum and naked eye, and the RGB analysis was obtained good results. • The confocal fluorescence imaging of Al3+ and lysine gained favorable results. [ABSTRACT FROM AUTHOR]