scholarly journals Neutral N^C^N terdentate luminescent Pt(ii) complexes: their synthesis, photophysical properties, and bio-imaging applications

2015 ◽  
Vol 44 (18) ◽  
pp. 8478-8487 ◽  
Author(s):  
Alessia Colombo ◽  
Federica Fiorini ◽  
Dedy Septiadi ◽  
Claudia Dragonetti ◽  
Filippo Nisic ◽  
...  

The reported cyclometallated Pt(ii) complexes are characterized by a high cell permeability and a low cytotoxicity. In particular, PtL1Cl shows a very fast internalization kinetics.

2020 ◽  
Vol 17 ◽  
Author(s):  
Ahmed Nuri Kursunlu ◽  
Elif Bastug ◽  
Ersin Guler

Background: Chemosensor compounds are useful for sensitive selective detection of cations and anions with fluorophore groups in an attempt to develop the effective selectivity of the sensors. Although familiar fluorescent sensors utilizing inter-molecular interactions with the cations and anions, an extraordinary endeavor was executed the preparation of fluorescent-based sensor compounds. 4,4-difluoro-4- bora-3a,4a-diaza-s-indacene (Bodipy) and its derivatives were firstly used as an agent in the imaging of biomolecules due to their interesting structures, complexation, and fluorogenic properties. Among the fluorescent chemosensors used for cations and anions, Bodipy-based probes stand out owing to the excellent properties such as sharp emission profile, high stability, etc. In this review, we emphasize the Bodipy-based chemosensor compounds, which have been used to image cations and anions in living cells, because of as well as the biocompatibility and spectroscopic properties. Methods: Research and online content related to chemosensor online activity is reviewed. The advances, sensing mechanisms and design strategies of the fluorophore exploiting selective detection of some cation and anions with Bodipy-based chemosensors are explained. It could be claimed that the using of Bodipy-based chemosensors is very important for cations and anions in bio-imaging applications. Results: Molecular sensors or chemosensors are molecules that show a change can be detected when affected by the analyte. They are capable of producing a measurable signal when they are selective for a particular molecule. Molecular and ion recognition that it is important in biological systems such as enzymes, genes, environment, and chemical fields. Due to the toxic properties of many heavy metal ions, it is of great importance to identify these metals due to their harmful effects on living metabolism and the pollution they create in the environment. This process can be performed with analytical methods based on atomic absorption and emission. The fluorescence methods among chemosensor systems have many advantages such as sensitivity, selectivity, low price, simplicity of using the instrument and direct determination in solutions. The fluorescence studies can be applied at nanomolar concentrations. Conclusion: During a few decades, a lot of Bodipy-based chemosensors for the detection of cations & anions have been investigated in bio-imaging applications. For the Bodipy-based fluorescent chemosensors, the Bodipy derivatives were prepared by different ligand groups for the illumination of the photophysical and photochemical properties. The synthesized Bodipy-based chemosensors have remarkable photophysical properties, such as a high quantum yield, strong molar absorption coefficient etc. Moreover, these chemosensors were successfully implemented on living organisms for the detection of analytes.


Nanoscale ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 2982-2994
Author(s):  
Gang Wei ◽  
Kezhen Zhang ◽  
Yuanlong Gu ◽  
Shanyi Guang ◽  
Jihong Feng ◽  
...  

Octathiol POSS was used to connect PEG-400, hexene, folic acid, fluorescein, and thioguanine using a simple and efficient photo-initiated one-pot method to prepare multifunctional molecules, which have targeted imaging and therapeutic functions.


2016 ◽  
Vol 40 (10) ◽  
pp. 8809-8814 ◽  
Author(s):  
Shasha Xu ◽  
Yingzhong Zhu ◽  
Rui Li ◽  
Jian Su ◽  
Shengli Li ◽  
...  

Two novel D–π–A structural chromophores showing large 2PA active cross-sections, low cytotoxicity and high stability in near-IR bio-imaging.


2019 ◽  
Vol 141 (30) ◽  
pp. 12100-12108 ◽  
Author(s):  
Prem N. Basa ◽  
Chelsea A. Barr ◽  
Kady M. Oakley ◽  
Xiaomeng Liang ◽  
Shawn C. Burdette

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4428
Author(s):  
Tamara Potlog ◽  
Ion Lungu ◽  
Pavel Tiuleanu ◽  
Stefan Robu

This paper focuses on the linking of zinc phthalocyanine (ZnPc) to N-vinylpyrrolidone (N-VP): acryloyl chloride (ClAC) copolymer. The synthesis of binary N-VP:ClAC copolymer was performed by the radical polymerization method and then grafted to ZnPc by the Friedel Crafts acylation reaction. We have developed a water-soluble ZnPc:ClAC:N-VP photosensitizer with a narrow absorption band at 970 nm, fluorescence at λem = 825 nm and the decay fluorescence profile with 3-decay relatively longer times of 1.2 µs, 4.6 µs, and 37 µs. The concentration-dependent dark cytotoxicity investigated in normal fibroblasts (NHDF), malignant melanoma (MeWo), adenocarcinoma (HeLa), and hepatocellular carcinoma (HepG2) cell lines incubated to increased concentrations of ZnPc:ClAC:N-VP (up to 40 μM) for 24 h in the dark show low cytotoxicity. Maximum cell viability in HeLa and HepG2 tumor cell lines was observed.


Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 95 ◽  
Author(s):  
Muhammad Imran ◽  
Muhammad Ramzan ◽  
Ahmad Qureshi ◽  
Muhammad Khan ◽  
Muhammad Tariq

In recent years, scientific advancements have constantly increased at a significant rate in the field of biomedical science. Keeping this in view, the application of porphyrins and metalloporphyrins in the field of biomedical science is gaining substantial importance. Porphyrins are the most widely studied tetrapyrrole-based compounds because of their important roles in vital biological processes. The cavity of porphyrins containing four pyrrolic nitrogens is well suited for the binding majority of metal ions to form metalloporphyrins. Porphyrins and metalloporphyrins possess peculiar photochemical, photophysical, and photoredox properties which are tunable through structural modifications. Their beneficial photophysical properties, such as the long wavelength of emission and absorption, high singlet oxygen quantum yield, and low in vivo toxicity, have drawn scientists’ interest to discover new dimensions in the biomedical field. Applications of porphyrins and metalloporphyrins have been pursued in the perspective of contrast agents for magnetic resonance imaging (MRI), photodynamic therapy (PDT) of cancer, bio-imaging, and other biomedical applications. This review discusses photophysics and the photochemistry of porphyrins and their metal complexes. Secondly, it explains the current developments and mode of action for contrast agents for MRI. Moreover, the application of porphyrin and metalloporphyrin-based molecules as a photosensitizer in PDT of cancer, the mechanism of the generation of reactive oxygen species (ROS), factors that determine the efficiency of PDT, and the developments to improve this technology are delineated. The last part explores the most recent research and developments on metalloporphyrin-based materials in bio-imaging, drug delivery, and the determination of ferrochelatase in bone marrow indicating their prospective clinical applications.


2019 ◽  
Vol 43 (8) ◽  
pp. 3303-3308 ◽  
Author(s):  
Sima Paul ◽  
Rajesh Nandi ◽  
Kakali Ghoshal ◽  
Maitree Bhattacharyya ◽  
Dilip K. Maiti

A newly designed and synthesized probe showed good cell permeability, low cytotoxicity, fast fluorogenic recognition, and “naked-eye” detection of a lethal health hazard, hydrazine, even at concentrations significantly below the TLV levels present in living cells, drinking water and industrial effluent.


2021 ◽  
Vol 22 (22) ◽  
pp. 12542
Author(s):  
Oxana Kazakova ◽  
Roxana Racoviceanu ◽  
Anastasiya Petrova ◽  
Marius Mioc ◽  
Adrian Militaru ◽  
...  

Twenty lupane type A-ring azepano-triterpenoids were synthesized from betulin and its related derivatives and their antitubercular activity against Mycobacterium tuberculosis, mono-resistant MTB strains, and nontuberculous strains Mycobacterium abscessus and Mycobacterium avium were investigated in the framework of AToMIc (Anti-mycobacterial Target or Mechanism Identification Contract) realized by the Division of Microbiology and Infectious Diseases, NIAID, National Institute of Health. Of all the tested triterpenoids, 17 compounds showed antitubercular activity and 6 compounds were highly active on the H37Rv wild strain (with MIC 0.5 µM for compound 7), out of which 4 derivatives also emerged as highly active compounds on the three mono-resistant MTB strains. Molecular docking corroborated with a machine learning drug-drug similarity algorithm revealed that azepano-triterpenoids have a rifampicin-like antitubercular activity, with compound 7 scoring the highest as a potential M. tuberculosis RNAP potential inhibitor. FIC testing demonstrated an additive effect of compound 7 when combined with rifampin, isoniazid and ethambutol. Most compounds were highly active against M. avium with compound 14 recording the same MIC value as the control rifampicin (0.0625 µM). The antitubercular ex vivo effectiveness of the tested compounds on THP-1 infected macrophages is correlated with their increased cell permeability. The tested triterpenoids also exhibit low cytotoxicity and do not induce antibacterial resistance in MTB strains.


Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1575
Author(s):  
Karthiga K. Anpalagan ◽  
Jimsheena V. Karakkat ◽  
Adam Truskewycz ◽  
Ahmed Al Saedi ◽  
Paul Joseph ◽  
...  

Biocompatible carbon quantum dots (CQDs) have recently attracted increased interest in biomedical imaging owing to their advantageous photoluminescence properties. Numerous precursors of fluorescent CQDs and various fabrication procedures are also reported in the literature. However; the use of concentrated mineral acids and other corrosive chemicals during the fabrication process curtails their biocompatibility and severely limits the utilization of the products in cell bio-imaging. In this study; a facile; fast; and cost-effective synthetic route is employed to fabricate CQDs from a natural organic resource; namely bread; where the use of any toxic chemicals is eliminated. Thus; the novel chemical-free technique facilitated the production of luminescent CQDs that were endowed with low cytotoxicity and; therefore; suitable candidates for bioimaging sensors. The above mentioned amorphous CQDs also exhibited fluorescence over 360–420 nm excitation wavelengths; and with a broad emission range of 360–600 nm. We have also shown that the CQDs were well internalized by muscle myoblasts (C2C12) and differentiated myotubes; the cell lines which have not been reported before.


2014 ◽  
Vol 67 (10) ◽  
pp. 1422 ◽  
Author(s):  
Xiaoyong Pan ◽  
Wei Ren ◽  
Liuqun Gu ◽  
Guan Wang ◽  
Ye Liu

Photoluminescent behaviours of chitosan were investigated. Photoluminescence can be observed from aqueous solution of chitosan, and CO2 treatment can improve the intensity of photoluminescence. The maximum emission is obtained with an excitation at ~336 nm, and the emission wavelength is dependent on the excitation wavelength with a longer excitation wavelength leading to a longer emission wavelength. The chemistry of chitosan before and after CO2 treatment was characterised; and the results reflect that carbamato anion is formed via the reaction between the amines and CO2, and is the fluorophore of the photoluminescence observed. Furthermore, chitosan was applied as an imaging agent for imaging MCF-7 cells using confocal microscopy. Blue and bright green imaging of the cells can be obtained via tuning the excitation and emission wavelength. Together with a low cytotoxicity reflected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide evaluation, fluorescent chitosan is promising for bio-imaging.


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