A novel pyrene-based fluorescent probe for the rapid and efficient detection of Co2+ in HeLa cells and natural water samples
摘要:
Excessive levels of Co2+ in the environment can cause serious diseases to humans and affect the growth of crops. Therefore, it is necessary to develop effective methods for monitoring Co2+. In the present work, a novel, low-toxic fluorescent probe, PEPA, for the rapid and efficient detection of Co2+ is synthesized. PEPA shows high sensitivity, with a limit of detection of 0.104 mu M and a fast response to Co2+ (<4 min). The detection mechanism was confirmed by FT-IR. HRMS and DFT calculations. Co2+ can restrict the free rotation of the C=N group and the pyrazine ring of PEPA, resulting in the enhancement of fluorescence. In addition, the recognition process of Co2+ can be realized with the naked eye (i.e., a color change from colorless to blue fluorescence). The successful detection of Co2+ in test strips and environmental water samples provides strong support for its application potential. Interestingly, the recovery rate of Co2+ detected by PEPA can reach 93% after being recovered four times. Importantly, PEPA was suitable for the fluorescence imaging of exogenous Co2+ in HeLa cells. (C) 2020 Elsevier B.V. All rights reserved.
Benzothieno[3,2-e][1,2,4]triazolo[4,3-c]pyrimidines: Synthesis, Characterization, Antimicrobial Activity, and Incorporation into Solid Lipid Nanoparticles
作者:Shridhar I. Panchamukhi、Jameel Ahmed S. Mulla、Nitinkumar S. Shetty、Mohammed Iqbal A. Khazi、Ashraf Y. Khan、Mallikarjun B. Kalashetti、Imitiyaz Ahmed M. Khazi
DOI:10.1002/ardp.201000227
日期:2011.6
from the corresponding 2‐amino‐4,5,6,7‐tetrahydrobenzo[b]thiophene‐3‐carbonitrile. These precursors were intern prepared by employing the Gewald's reaction. All the newly synthesized compounds were characterized by spectral and analytical data. Title compounds displayed promising antibacterial and antifungal activities. Compound 3h which exhibited good antimicrobial activity was incorporated into SLN
Controlling enzyme reactions by supramolecular protection and deprotection of oligosaccharide substrates
作者:Milad Zangiabadi、Yan Zhao
DOI:10.1039/d2cc03239b
日期:——
absent in enzymaticreactions. We here report supramolecular protective receptors that outcompete an enzyme in the binding of oligosaccharides. The strong binding inhibits the enzymaticreaction and addition of an even stronger ligand for the receptor releases the substrate. These receptors could be used to control products from the same substrate/enzyme mixture and regulate enzymaticreactions reversibly