Extending the excitation wavelength from UV to visible light for a europium complex-based mitochondria targetable luminescent probe for singlet oxygen

2018 ◽  
Vol 47 (37) ◽  
pp. 12852-12857 ◽  
Author(s):  
Hua Ma ◽  
Xin Wang ◽  
Bo Song ◽  
Liu Wang ◽  
Zhixin Tang ◽  
...  
Keyword(s):  
Visible Light ◽  
Singlet Oxygen ◽  
Europium Complex ◽  
Excitation Wavelength ◽  
Luminescent Probe ◽  
Luminescence Detection

A visible-light-excitable Eu3+ complex-based luminescent probe for the time-gated luminescence detection of singlet oxygen in vitro and in vivo.

scholarly journals BanLec-eGFP Chimera as a Tool for Evaluation of Lectin Binding to High-Mannose Glycans on Microorganisms

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 180
Author(s):  
Zorana Lopandić ◽  
Luka Dragačević ◽  
Dragan Popović ◽  
Uros Andjelković ◽  
Rajna Minić ◽  
...  
Keyword(s):  
Fluorescent Protein ◽  
Lectin Binding ◽  
Three Dimensional ◽  
Data Bank ◽  
Salmonella Typhi ◽  
Excitation Wavelength ◽  
Protein Data Bank Entry ◽  
High Mannose

Fluorescently labeled lectins are useful tools for in vivo and in vitro studies of the structure and function of tissues and various pathogens such as viruses, bacteria, and fungi. For the evaluation of high-mannose glycans present on various glycoproteins, a three-dimensional (3D) model of the chimera was designed from the crystal structures of recombinant banana lectin (BanLec, Protein Data Bank entry (PDB): 5EXG) and an enhanced green fluorescent protein (eGFP, PDB 4EUL) by applying molecular modeling and molecular mechanics and expressed in Escherichia coli. BanLec-eGFP, produced as a soluble cytosolic protein of about 42 kDa, revealed β-sheets (41%) as the predominant secondary structures, with the emission peak maximum detected at 509 nm (excitation wavelength 488 nm). More than 65% of the primary structure was confirmed by mass spectrometry. Competitive BanLec-eGFP binding to high mannose glycans of the influenza vaccine (Vaxigrip®) was shown in a fluorescence-linked lectin sorbent assay (FLLSA) with monosaccharides (mannose and glucose) and wild type BanLec and H84T BanLec mutant. BanLec-eGFP exhibited binding to mannose residues on different strains of Salmonella in flow cytometry, with especially pronounced binding to a Salmonella Typhi clinical isolate. BanLec-eGFP can be a useful tool for screening high-mannose glycosylation sites on different microorganisms.

scholarly journals Fiber-Optic Time-Resolved Fluorescence Sensor for in Vitro Serotonin Determination

1993 ◽  
Vol 47 (5) ◽  
pp. 590-597 ◽  
Author(s):  
Stephane Mottin ◽  
Canh Tran-Minh ◽  
Pierre Laporte ◽  
Raymond Cespuglio ◽  
Michel Jouvet
Keyword(s):  
Chemical Sensor ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Excitation Wavelength ◽  
Nitrogen Laser ◽  
Time Resolved ◽  
Temporal Effects ◽  
Starting Point

At pH 7 and with the excitation at wavelengths above 315 nm, previously unreported fluorescence of 5-HT (5-hydroxytryptamine) is observed. Two fluorescence bands were observed for 5-HT; the first emits at around 390 nm with an associated lifetime near 1 ns, and the other (well known) emits at 340 nm with an associated lifetime of 2.7 ns. With both static and time-resolved fluorescences, the spectral and temporal effects of the excitation wavelength were studied between 285 and 340 nm. With these basic spectroscopic properties as a starting point, a fiber-optic chemical sensor (FOCS) was developed in order to measure 5-HT with a single-fiber configuration, nitrogen laser excitation, and fast digitizing techniques. Temporal effects including fluorescence of the optical fiber were studied and compared with measurements both directly in cuvette and through the fiber-optic sensor. Less than thirty seconds are required for each measurement. A detection limit of 5-HT is reached in the range of 5 μM. Our system, with an improved sensitivity, could therefore be a possible and convenient “tool” for in vivo determination of 5-HT.

A new visible-light-excitable ICT-CHEF-mediated fluorescence ‘turn-on’ probe for the selective detection of Cd2+ in a mixed aqueous system with live-cell imaging

2015 ◽  
Vol 44 (12) ◽  
pp. 5763-5770 ◽  
Author(s):  
Shyamaprosad Goswami ◽  
Krishnendu Aich ◽  
Sangita Das ◽  
Chitrangada Das Mukhopadhyay ◽  
Deblina Sarkar ◽  
...  
Keyword(s):  
Visible Light ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Aqueous System ◽  
Live Cell ◽  
Selective Detection ◽  
Turn On ◽  
Fluorescence Turn On

A new quinoline based sensor was developed and applied for the selective detection of Cd2+ both in vitro and in vivo.

scholarly journals Heavy atom-free semiconducting polymer with high singlet oxygen quantum yield for prostate cancer synergistic phototherapy

2019 ◽  
Vol 3 (6) ◽  
pp. 1123-1127 ◽  
Author(s):  
Jian Shen ◽  
Jianjiao Chen ◽  
Zhen Ke ◽  
Dengfeng Zou ◽  
Liguo Sun ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Cancer Therapy ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Heavy Atom ◽  
Semiconducting Polymer ◽  
Prostate Cancer Therapy

Heavy atom free NDNT have a great potential for prostate cancer therapy both in vitro and in vivo.

Protective Effect of Fucoxanthin Isolated from Laminaria japonica against Visible Light-Induced Retinal Damage Both in Vitro and in Vivo

2016 ◽  
Vol 64 (2) ◽  
pp. 416-424 ◽  
Author(s):  
Yixiang Liu ◽  
Meng Liu ◽  
Xichun Zhang ◽  
Qingchou Chen ◽  
Haixiu Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Protective Effect ◽  
Laminaria Japonica ◽  
Retinal Damage

Europium-Doped Hydroxyapatite: Influence of Excitation Wavelength on the Eu3+ Luminescence in the Hydroxyapatite

2015 ◽  
Vol 820 ◽  
pp. 335-340 ◽  
Author(s):  
Flávia R.O. Silva ◽  
Nelson B. de Lima ◽  
Deiby S. Gouveia ◽  
Nildemar A.M. Ferreira ◽  
Valter Ussui ◽  
...  
Keyword(s):  
Precipitation Method ◽  
Excitation Wavelength ◽  
Careful Evaluation ◽  
Lanthanide Ion ◽  
Site Occupation ◽  
Different Temperatures ◽  
Co Precipitation ◽  
The Eu

Hydroxyapatite (HA) doped with europium (HAEu) offers the advantage of making the hydroxyapatite a fluorescent biomarker, allowing their imaging through emissionin vivoandin vitrotests. Several authors had been based their studies about europium site occupation (CaI and CaII) in hydroxyapatite by the lanthanide ion luminescence, verifying the influence of the method of synthesis and concentration of the dopant ion. In this study HA nanoparticles doped with 1.4 mol% of trivalent europium were synthesized by co-precipitation method and thermal treated at different temperatures (600°C and 1200°C). A careful evaluation of the influence of the excitation wavelength of europium luminescence in the HAEu was performed and it has been verified that both the characteristics transitions of europium, at CaI and CaII sites, and the luminescent intensity are dependent on the excitation wavelength. The non-observance of this fact can lead to erroneous conclusions about the site occupation of europium in hydroxyapatites.

Reversible and selective luminescent determination of ClO−/H2S redox cycle in vitro and in vivo based on a ruthenium trisbipyridyl probe

The Analyst ◽  
2014 ◽  
Vol 139 (13) ◽  
pp. 3324-3329 ◽  
Author(s):  
Fengyu Liu ◽  
Yulong Gao ◽  
Jitao Wang ◽  
Shiguo Sun
Keyword(s):  
Redox Cycle ◽  
Luminescent Probe ◽  
Ruthenium Trisbipyridyl

A reversible and highly selective luminescent probe was successfully employed for the determination of ClO− and H2S and for monitoring the ClO−/H2S redox cycle both in vitro and in vivo.

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