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Journal of Fluorescence

Shiying Gao, Yonghe Tang, Weiying Lin
Methylglyoxal (MGO) is one of the most important active carbonyl compounds in living organisms. It is a metabolic by product of glycolysis. MGO participates in glycosylation of proteins and nucleic acids to trigger carbonyl stress, inducing pathological status and even exacerbateing the development of chronic degenerative diseases. In order to study the diseases caused by MGO, it is meaningful for us to develop methods that could efficiently detect MGO. In our work, a new two-photon fluorescent turn-on probe which named NP has been designed which was made up of naphthalimides dye as the two-photon fluorescent platform and the o-phenylenediamine as recognition site...
November 12, 2018: Journal of Fluorescence
Shikha Bhogal, Kuldeep Kaur, Seema Maheshwari, Ashok Kumar Malik
In this work, we report an environment friendly core-shell material based on Carbon Dot core and Molecularly Imprinted Polymer shell as sensor for highly selective fluorescence detection of ketoprofen. The Carbon Dots (CDs) were prepared by a hydrothermal method and the polymer layer around the CDs core was synthesised by sol-gel polymerisation. The prepared material was characterized by Fluorescence Spectroscopy, FT-IR Spectroscopy and Transmission Electron Spectroscopy (TEM). Fluorescence from the Carbon Dots- Molecularly Imprinted Polymer (CDs-MIP) was found to quench selectively in the presence of ketoprofen and quenching effect was found to be greater than for Non-Imprinted Polymer (CDs-NIP) which indicated the potential of CDs-MIP as a fluorescence sensing material for ketoprofen...
November 10, 2018: Journal of Fluorescence
Denzil Britto Christopher Leslee, Sekar Karuppannan, Muthu Vengaian Karmegam, Sivaraman Gandhi, Singaravadivel Subramanian
Carbazole - Rhodanine conjugate is an effective fluorescent host for silver ions through fluorometric transformation from green to red color with a hyperchromic emission. An intramolecular charge transfer process derived from carbazole towards rhodanine favors interaction of thiocarbonyl S and carboxylic acid O of the rhodanine moiety towards Ag+ ion. Carbazole - rhodanine dyad accomplishes the lowest detection limit of 12.8 × 10-9  M and high quantum efficiency. A fluorescence reversibility of the probe with I- ion surges reutilization of sensor molecule as an Ag+ ion probe with minimal loss in the fluorescent efficiency...
November 10, 2018: Journal of Fluorescence
Yuan He, Zhenzhen Feng, Xinjian Shi, Shan Li, Yunguo Liu, Guangming Zeng, Hua He
In this work, we report a dual use of highly fluorescent N- and O-doped carbon dots (CDs) for rapid and high-throughput trace analysis of iron in water and organic phases. The CDs are rapidly synthesized in a sealed vessel via microwave irradiation within 5 min, and they exhibit high quantum yields of 80% with sensitive quenching responses to iron contents. Combined with a microplate fluorescence reader, a rapid and high-throughput assay for ions is further developed. The whole process from the CD synthesis to the detection output can be accomplished within 15 min...
November 7, 2018: Journal of Fluorescence
Dongmei Zhang, Giuma E Hadhoud, Karen Helm, Deborah A Roess, B George Barisas
We present complementary flow cytometric and microscopic imaging methods, both utilizing a membrane-targeted cAMP sensor protein ICUE3, to examine hormone-dependent signaling by the luteinizing hormone (LH) receptor in individual cells. This receptor, a seven transmembrane domain protein belonging to the GPCR family, signals by activating adenylate cyclase to increase cAMP levels. The ICUE3 sensor protein exhibits fluorescence energy transfer between its CFP and YFP moieties and the ratio of CFP emission to YFP sensitized emission (YFPSE) increases with cAMP concentration...
November 1, 2018: Journal of Fluorescence
Manali Rajeshirke, Dharit Shah, Nagaiyan Sekar
The synthesis, photophysical, linear and nonlinear optical (NLO) properties of novel fluorescent styryls based on 2-N,N-dibutylamino-4-phenyl thiazole as donor attached to different acceptor groups via conjugated π-bridge were studied with the help of solvatochromic model. The NLO properties of extended styryls based on benzylidene malononitrile and isophorone were more enhanced than the simple styryls based on malononitile and ethylcyano acetate which was attributed to the longer conjugation path. The benzylidene based extended styryl dye showed maximum value of two-photon absorption cross section σ2PA 98...
October 30, 2018: Journal of Fluorescence
Soma Mukherjee, Soumi Betal
A novel luminescent hydrazone ligand was synthesized via 1:1 condensation reaction of 9-anthracene aldehyde and 2-hydrazinobenzoic acid followed by its characterization with the help of absorption, emission, FTIR, NMR and mass studies. It was investigated as a reversible, ratiometric and turn-on luminescent chemosensor for Cu2+ in aqueous environment. The receptor shows a prominent color change in presence of Cu2+ from yellow to reddish brown in DMSO-H2 O (2:1) medium. Upon addition of Cu2+ , a remarkable increment in emission intensity (Φ = 0...
October 29, 2018: Journal of Fluorescence
Archana A Bhagwat, Nagaiyan Sekar
The effect of three substituents N,N-diethylamine, carbazole and diphenylamine at the 7 position of coumarin on linear and nonlinear optical properties are studied using absorption and emission solvatochromism, and DFT. By varying the substituent 53 nm red shift is achieved in emission. The polarity plots with regression close to unity revealed good charge transfer in the system. Solvent polarizability and dipolarity are mainly responsible for solvatochromic shift as proved by multilinear regression analysis...
October 29, 2018: Journal of Fluorescence
Manju Sengar, Anudeep Kumar Narula
Five luminescent Eu(III)-4-fluoro-N-salicylideneaniline (Fsa) complexes with different N,N'- donor heterocyclic ligands (L) were synthesized (where L = 2,2'-bipyridine (bipy), 4,4'-dimethoxy-2,2'-bipyridine (dmbp), 1,10-phenanthroline (phen), 2,9-dimethyl-1,10-phenanthroline (neo) and 2,2'-biquinoline (biq)) and characterized by structural, thermal and spectroscopic analyses. The photophysical studies of the complexes viz. UV-Vis absorption spectra, emission spectra, lifetime decay curve, radiative, non-radiative transition rates and quantum yields were investigated...
October 27, 2018: Journal of Fluorescence
A Sáenz-Trevizo, P Pizá-Ruiz, D Chávez-Flores, J Ogaz-Parada, P Amézaga-Madrid, A Vega-Ríos, M Miki-Yoshida
The discoloration of methylene blue in aqueous solution was studied under illumination by a fluorescent lamp, LEDs of red, green, and blue light, and a UV-A black light bulb. Overall results showed that methylene blue was discolored with and without the presence of any photoactive semiconductor. Outcomes depended on the combination substrate-light source employed. Photosensitization was assumed as the discoloration mechanism followed upon visible light irradiation. Fluorescence spectroscopy and high-performance liquid chromatography were used to investigate the possible intermediates formed in the irradiated solutions...
October 26, 2018: Journal of Fluorescence
Sule Ozkan, Tugba Taskin-Tok, Ayse Uzgoren-Baran, Nuriye Akbay
Mode of interaction of a new tetrahydrocarbazole derivative with ct-DNA has been investigated systematically using fluorescence spectroscopy, UV-Vis spectroscopy and circular dichroism spectroscopy. It is concluded that TAH could intercalate into the base pairs of ct-DNA, and the fluorescence quenching by ct-DNA was static quenching type. Beside the multispectroscopic results, computational studies were done. Molecular docking results revealed that the TAH-DNAs complexes might be classified as druggable molecule in drug design...
October 25, 2018: Journal of Fluorescence
Varsha Gujar, Vijay Sangale, Divya Ottoor
A fluorophore modulation with sodium dodecyl sulphate (SDS) assemblies for the selective and sensitive sensing of Fe3+ ions in aqueous solution is illustrated in this work. Emission spectral characteristics of fluorescent molecule, propranolol (PPH) was intact in presence of metal ions. While on modulation with SDS assemblies, PPH was transformed into a tuneable sensor for Fe3+ ions. This sensor ensemble was not only highly sensitive towards Fe3+ ions in aqueous solution with detection limits lower than 3 μM but also possess high discriminating efficiency in presence of other metal ions like Cu2+ , Pb2+ , Zn2+ , Ni2+ , Fe2+ , Cd2+ , Co2+ , Al3+ , Mg2+ , Hg2+ and Mn2+ ...
October 25, 2018: Journal of Fluorescence
Hongwei Ge, Kui Zhang, Huan Yu, Ji Yue, Long Yu, Xinfeng Chen, Tianxin Hou, Khalid A Alamry, Hadi M Marwani, Suhua Wang
This paper reported a dual-mode probe for D-penicillamine on the basis of pH-mediated gold nanoparticles aggregation and fluorescence resonance energy transfer (FRET) from carbon dots. D-penicillamine is a zwitterionic compound and has different forms depending on specific pH ranges. The thiol group of D-penicillamine has high affinity towards the surface of gold nanoparticles and can replace other surface ligands. When pH values were close to its isoelectrical point (pH(I)), the D-penicillamine capped gold nanoparticles aggregated through hydrogen bonding or electrostatic interactions, resulting in the releasing of carbon dots from gold nanoparticles...
October 23, 2018: Journal of Fluorescence
Şükriye Nihan Karuk Elmas, Ibrahim Yilmaz
The selective and sensitive determination of biothiols in aqueous media has been great attention due to their important role in biological and pharmacological processes. We synthesized tryptophan functionalized perylene bisimide as a sensing chemosensor for mercury in aqueous solution. This complex between perylene dimide derivate (PDI/Trp) and mercury ions was evaluated and displayed to be turn on fluorescent chemosensor for the determination of biothiols in aqueous media. PDI/Trp showed fluorescence quenching in the presence of Hg2+ and the fluorescence was recovered after addition of biological thiols (cysteine, homocysteine and glutathione)...
October 23, 2018: Journal of Fluorescence
Mingyu Chapman, William B Euler
In water rhodamine 6G (Rh6G) tends to form aggregates at higher concentrations while in ethanol the aggregation is minimal. The extent of aggregation can be controlled by changing the water to ethanol ratio. In ethanol the absorption spectra have a low energy peak and a higher energy shoulder, which are assigned to the S1 π-π* transition and vibronic side band, respectively, of Rh6G monomers. In water the same two peaks absorption peaks are observed at low concentrations but at higher concentrations a new peak grows in, which is assigned to an H-dimer...
October 21, 2018: Journal of Fluorescence
Hasnaa M Fahmy, Hamed M Kandel, Hamdan A S Al-Shamiri, Nabel A Negm, Ahmed H M Elwahy, Maram T H Abou Kana
Novel 7,7'-((anthracene-9,10-diylbis(methylene))bis(oxy))bis(4-methyl-2H-chromen-2-one) (BisCA) was prepared as fluorescent probe. The chemical structure of the novel BisCA was confirmed by spectroscopic data as well as elemental analyses. The solvatochromic characteristics of the new proble and its precursors were investigated in different solvents including, ethanol, DMF and toluene as protic polar, aprotic polar and non-polar solvents, respectively. Photo-physical parameters of probes, such as fluorescence quantum yields, fluorescence lifetime of excited state, radiative and non-radiative decay, were assessed in different media...
October 21, 2018: Journal of Fluorescence
Emine Koç, Selcen Çelik-Uzuner, Uğur Uzuner, Ramazan Çakmak
The evaluation of cell wellness is an important task for molecular biology research. This mainly comprises the assessment for morphology and viability of culturing cells. Annexin V-Propidium iodide counterstaining has been currently one of the common and easy methods to discriminate apoptotic and necrotic cell profiles. The method is operated by fluorescence-based detection of counterstain via laser beam-employed instruments including flow cytometer, fluorescence microscope and automated cell counter. The detection is primarily conducted based on the same principle; however the efficiency of instruments may vary...
October 21, 2018: Journal of Fluorescence
Soheil Sharifi, Galiullina Leisan Faritovna, Afshin Azarpour
The photophysical and nonlinear optical properties of Azophloxine in Reverse micelle (RM) and dye-surfactant interaction were studied using Z-scan, spectrophotometer, and spectrofluorometer techniques. The different range of RM sizes and oil polarity is studied. RM is a mixture of water droplet in a continuous phase of oil and its polarity depends on oil polarity. The nonlinear absorption coefficient (β) and nonlinear refractive index (n2 ) of Azophloxine in RM depend on the polarity of bulk. By using the NMR instrument, it was observed that the Azophloxine dye is intercalated in the reverse micelles in AOT/Water/Benzene solution and its average location corresponds with the core of the micelle close to polar groups of the surfactant...
October 18, 2018: Journal of Fluorescence
Nurcan Tuncer, Efdal Teknikel, Canan Unaleroglu
We investigated the pKa increasing effects on meso-phenol BODIPY to achieve fluorescent pH sensors working in extreme alkalinity. We demonstrated the effects of substituents on meso, α, γ and position of the hydroxyl group on pKa . By considering these parameters, we developed pH sensors working above 11.0 in aqueous medium (ethanol/water 1:1). One of these sensors had a pKa of 12.0 and enabled the measurement of pH up to 13.6. This highly photostable and bright sensor compound could be synthesized easily from cheap starting materials...
October 18, 2018: Journal of Fluorescence
Umit Ay, Sinem Ezgi Sarlı
Inclusion complex of naphthalene with methyl-beta-cyclodextrin in water has been formed. The aqueous solutions of the various amounts of Co2+ ve Mn2+ salts have been added to naphthalene-methyl-beta-cyclodextrin (NAP-Me-β-CD) inclusion complexes. Fluorescence properties of the naphthalene (NAP) compound have been utilized to observe the changes in fluorescence intensities. Stern-Volmer quenching constants and fluorescence quantum yields have been calculated. Characterization of the resulting complex by FT-IR and 1 H NMR technique has been determined...
October 2, 2018: Journal of Fluorescence
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