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Journal of Fluorescence

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https://www.readbyqxmd.com/read/28712051/a-carbazole-fused-rhodamineprobe-for-detection-of-hocl-in-living-cells
#1
Rui Guo, Qiuan Wang, Weiying Lin
A novel fluorescent probe CR-ClO for detection of HOCl based on a carbazole fused rhodamine was designed and synthesized. The probe utilized a HOCl-promoted oxidation reaction, which lead to the ring opening of the compound with a strong enhancement of the fluorescent emission at about 587 nm.The new probe CR-ClO has excellent selectivity and high sensitivity to ClO(-),whose detection limit to ClO(-) is 1.16 × 10(-6) M. Furthermore, the new probe has been successfully applied in living cells for detection of ClO(-)...
July 15, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28710701/a-fluorescence-quenching-study-of-naphthalimide-dye-by-graphene-mechanism-and-thermodynamic-properties
#2
Sanaz Seraj, Shohre Rouhani
Graphene oxide is an efficient fluorescence quencher for various organic dyes. Herein the fluorescence quenching of graphene oxide has been carried out on a naphthalimide dye as a fluorescent probe model. The interaction between naphthalimide dye and graphene oxide was studied by UV-Vis and fluorescence spectroscopic techniques. The results indicated that graphene is a very efficient quencher for naphthalimide molecule. The Stern-Volmer analysis revealed that the remarkable quenching of graphene was based on a combined static and dynamic quenching mechanism and went through an energy transfer process...
July 14, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28698946/ultra-sensitive-nano-optical-sensor-samarium-doxycycline-doped-in-sol-gel-matrix-for-assessment-of-glucose-oxidase-activity-in-diabetics-disease
#3
Marwa M Tharwat, M S Attia, M S Alghamdi, Amr M Mahros
A low cost and very sensitive method for the determination of the activity of glucose oxidase enzyme in different diabetics serum samples was developed. The method based on the assessment of the H2O2 concentration produced from the reaction of the glucose oxidase (GOx) enzyme with glucose as substrate in the serum of diabetics patients by nano optical sensor Sm-doxycycline doped in sol gel matrix. H2O2 enhances the luminescence intensity of all bands of the nano Sm-doxycycline complex [Sm-(DC)2](+) doped in sol-gel matrix, especially the 645 nm band at λex = 400 nm and pH 7...
July 11, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28687985/a-method-for-in-vitro-measurement-of-oxidized-low-density-lipoprotein-in-blood-using-its-antibody-fluorescence-labeled-heptapeptide-and-polyethylene-glycol
#4
Akira Sato, Yoji Yamazaki, Keiichi Ebina
Two oxidized forms of low-density lipoprotein (LDL), oxidized (Ox-LDL) and minimally modified (MM-LDL), and the immune complexes (LDL-ICs) that they form with their corresponding antibodies, play a major role in the pathogenesis of atherosclerosis. Recently, we reported that the heptapeptide KP6 (Lys-Trp-Tyr-Lys-Asp-Gly-Asp) coupled through its ε-amino group present on the N-terminal Lys to fluorescein isothiocyanate (FITC)- (FITC)KP6- binds specifically to Ox-LDL and MM-LDL, but not to native LDL. Here, to develop a novel method for measuring the levels of oxidatively modified LDL in blood, using (FITC)KP6, we analyzed the latter's binding with MM-LDL-IC and Ox-LDL-IC...
July 7, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28687984/comparison-of-the-optoelectronic-performance-of-neutral-and-cationic-forms-of-riboflavin
#5
Gözde Murat Saltan, Deniz Aykut Kıymaz, Ceylan Zafer, Haluk Dinçalp
The riboflavin dye 2,3,4,5-tetra-O-acetyl-1-[3-(6-bromohexyl)-7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl]-1-deoxypentitol and its pyridinium salt were synthesized, and studied by absorption and fluorescence spectroscopy in solutions and on thin film states. The first absorption band of riboflavin-pyridinium salt derivative is red-shifted by 10 nm compared to neutral one on film. Cationic riboflavin derivative shows significant wavelength changes on its fluorescence emission spectrum in the excited state depending on the solvent polarity and the electronic environment...
July 7, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28687983/sensing-tryptophan-microenvironment-of-amyloid-protein-utilizing-wavelength-selective-fluorescence-approach
#6
Hirak Chakraborty, Amitabha Chattopadhyay
Structural transition among various forms of proteins involves subtle interplay between structure and dynamics and is crucial in human diseases. Red edge excitation shift (REES) represents a suitable approach to explore the environmental organization and dynamics surrounding tryptophan residues in proteins. Although REES from tryptophan residues has been reported for native, molten globule and denatured states of proteins, such data on the amyloid form of proteins is lacking. κ-casein is one of the most important constituents of casein micelles in milk and has a tendency to form amyloid fibril...
July 7, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28685217/dual-modes-and-dual-emissions-of-an-amino-naphthoquinone-derivative
#7
Munendra Pal Singh, Jubaraj B Baruah
3-(1,4-Dioxo-1,4-dihydronaphthalen-2-yl-amino)benzoic acid shows multiple tunable fluorescence emissions depending on solvent, pH and wavelength of excitation. Independent dual fluorescence emissions are observed while exciting compound 3-(1,4-dioxo-1,4-dihydronaphthalen-2-yl-amino)benzoic acid in UV-region or in visible region. In methanol at low concentration it shows both S1-S0 emission and ESIPT emission at 307 nm and 480 nm. Whereas in concentrated solution S1-S0 emission as well as dimer-like emission at 307 nm and 425 nm respectively are observed...
July 6, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28667371/surface-engineered-ho-3-incorporated-fluorescent-dye-doped-bifunctional-silica-nanoparticles-for-receptor-targeted-fluorescence-imaging-and-potential-magnetic-resonance-imaging
#8
Sasidharanpillai S Syamchand, Ravindran S Aparna, Sony George
The authors report Ho(3+) ion incorporated and fluorescent dye-doped silica nanoparticles which are engineered to enable the imaging modalities of receptor targeted fluorescence imaging (FI) and magnetic resonance imaging (MRI). The silica nanoparticles synthesized through a modified Stöber method is luminomagnetic by virtue of the luminescence of organic dye fluorophore (FITC) and magnetism of Ho(3+). The doping concentration of Ho(3+) is estimated by inductively coupled plasma mass spectrometry (ICP-MS) as 0...
June 30, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28667370/structure-photoproperties-relationship-investigation-of-the-singlet-oxygen-formation-in-porphyrin-fullerene-dyads
#9
Emel Önal, Sevinc Zehra Topal, Ismail Fidan, Savaş Berber, Fabienne Dumoulin, Catherine Hirel
A systematic structure-photoproperties relationship study of the interactions of porphyrin-fullerene dyads with molecular oxygen was conducted on a set of three porphyrin-fullerene dyads, as this approach of related applications - oxygen sensitivity and photo-induced singlet oxygen generation - of such dyads remained to be endeavoured. To promote energy transfers between the porphyrin and fullerene units and limit undesired charge separation, a particular attention was devoted to the choice of the solvents for the photoproperties determination...
June 30, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28653241/anti-prostate-cancer-activity-of-8-hydroxyquinoline-2-carboxaldehyde-thiosemicarbazide-copper-complexes-by-fluorescent-microscopic-imaging
#10
Fang Xie, Fangyu Peng
Copper 8-hydroxyquinoline-2-carboxaldehyde-thiosemicarbazide (CuHQTS) and copper 8-hydroxyquinoline-2-carboxaldehyde-4,4-dimethyl-3-thiosemicarbazide (CuHQDMTS) are two copper thiosemicarbazone complexes with potent anticancer activity on cisplatin-resistant neuroblastoma cells. This study aimed to evaluate anti-prostate cancer activity of these two copper complexes in vitro. Both CuHQTS and CuHQDMTS inhibited proliferation of prostate cancer cells and showed cytotoxicity on prostate cancer cells carrying green fluorescent protein (GFP) by fluorescent microscopic imaging...
June 26, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28646301/random-initialisation-of-the-spectral-variables-an-alternate-approach-for-initiating-multivariate-curve-resolution-alternating-least-square-mcr-als-analysis
#11
Keshav Kumar
Multivariate curve resolution alternating least square (MCR-ALS) analysis is the most commonly used curve resolution technique. The MCR-ALS model is fitted using the alternate least square (ALS) algorithm that needs initialisation of either contribution profiles or spectral profiles of each of the factor. The contribution profiles can be initialised using the evolve factor analysis; however, in principle, this approach requires that data must belong to the sequential process. The initialisation of the spectral profiles are usually carried out using the pure variable approach such as SIMPLISMA algorithm, this approach demands that each factor must have the pure variables in the data sets...
June 23, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28639213/study-on-photophysical-properties-of-n-arylphthalamic-acid-derivative-containing-1-2-4-triazole-scaffold
#12
K B Akshaya, Anitha Varghese, Y N Sudhakar, Prajwal Lourdes Lobo, Louis George
A novel N-arylphthalamic acid derivative, 2-({4-[(1H-1,2,4-triazol-1-yl)methyl]phenyl}carbamoyl)benzoic acid (TMPCB) was synthesized and their absorption and emission spectra were recorded in fifteen different solvents of varying polarities at room temperature. Ground state dipole moment of the derivative was calculated experimentally by Guggenheim method and solvatochromic approach proposed by Bilot-Kawski. The singlet excited state dipole moment of TMPCB were calculated experimentally based on different approaches of solvent polarity function proposed by Lippert-Mataga, Bakhshiev, Kawskii-Chamma-Viallet, Reichardt and Bilot-Kawski...
June 21, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28634885/colorimetric-determination-of-pb-2-in-perfect-aqueous-solution-using-carminic-acid-as-a-selective-chemosensor
#13
Masaru Sakamaki, Shunichi Aikawa, Yasumasa Fukushima
The commercially available natural organic dye, carminic acid (CA), an anthraquinone derivative bearing hydroxyl and carboxyl groups as recognition sites was found to be a colorimetric probe for Pb(2+) in perfect aqueous solution under neutral conditions with specific selectivity and high sensitivity. Upon addition of Pb(2+), the absorption maximum of CA showed a large red shift, and the resulted color change from red to purple could be easily identified even by the naked eye. The chemical stoichiometric ratio between CA and Pb(2+) was determined to be 1:2 through Job plot, Pb(2+) titration, and kinetic experiments...
June 21, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28634884/a-nanosensor-based-on-carbon-dots-for-recovered-fluorescence-detection-clenbuterol-in-pork-samples
#14
Yalan Liu, Qiujun Lu, Xiaojun Hu, Haiyan Wang, Haitao Li, Youyu Zhang, Shouzhuo Yao
Clenbuterol (CLB), a member of β-agonist family, has now been a serious threat to human health due to its illegal usage in the animal feed. In this paper, we designed a fluorescence resonance energy transfer (FRET) system consisting of carbon dots (C-dots) and gold nanoparticles (AuNPs) for recovered fluorescence detecting of CLB. In the presence of CLB, CLB molecules can interact with AuNPs via Au-N bonds, preventing the interaction of C-dots and AuNPs, which induced the recover of the fluorescent intensity...
June 20, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28612142/erratum-to-a-colorimetric-and-fluorescent-probe-based-on-michael-acceptor-type-diketopyrrolopyrrole-for-cyanide-detection
#15
Lingyun Wang, Shaochun Zhuo, Derong Cao
No abstract text is available yet for this article.
June 13, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28580505/photophysical-properties-of-a-novel-and-biologically-active-3-2h-pyridazinone-derivative-using-solvatochromic-approach
#16
Vani R Desai, Shirajahammad M Hunagund, Malatesh S Pujar, Mahantesha Basanagouda, Jagadish S Kadadevarmath, Ashok H Sidarai
Herein, we report photophysical properties of a novel and biologically active 3(2H)-pyridazinone derivative 5-(4-chloro-2-hydoxy-phenyl)-2-phenyl-2H-pyridazin-3-one [CHP] molecule using solvatochromic approaches. Absorption and fluorescence spectra of CHP molecule have been measured at room temperature in various solvents of different polarities. From this, it is observed that the positions, intensities and shapes of the absorption and emission bands are usually modified. Experimentally, the ground and excited state dipole moments are estimated using solvatochromic shift method which involves Lippert's, Bakshiev's and Kawski-Chamma-Viallet's equations...
June 5, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28577240/a-rhodamine-based-fluorescent-chemosensor-for-the-detection-of-pb-2-hg-2-and-cd-2
#17
Wei Su, Shizhuang Yuan, Enju Wang
A new rhodamine-based fluorescent chemosensor (1) has been designed and synthesized by linking rhodamine 6G hydrazide with N-methylisatin via an imine linkage. The receptor can selectively recognize and sense Pb(2+), Hg(2+) and Cd(2+) by showing different fluorescence characteristics. In ethanol/HEPES buffer medium, the addition of Cd(2+) caused a yellowish-green fluorescence, while the presence of Pb(2+) or Hg(2+) gave rise to an orange fluorescence. Additionally, the sensor shows an irreversible fluorescence response to Pb(2+) and reversible fluorescence responses to Hg(2+) and Cd(2+)...
June 3, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28567617/analysis-of-fluorescence-quenching-for-newly-synthesized-biologically-active-3-2h-pyridazinone-derivative-by-aniline
#18
Vani R Desai, Shirajahammad M Hunagund, Mahantesha Basanagouda, Jagadish S Kadadevarmath, Ashok H Sidarai
Herein, we have studied the analysis of fluorescence quenching for newly synthesized biologically active 3(2H)-pyridazinone derivative 5-(5-bromo-2-hydroxy-phenyl)-2-phenyl-2H-pyridazin-3-one [BHP] by various concentrations of aniline using UV-Visible spectroscopy, fluorescence spectroscopy and time-correlated single photon counting technique in five different solvents namely, methanol, ethanol, propan-2-ol, dimethylsulfoxide and ethyl acetate at room temperature. The fluorescence intensity of BHP molecule decrease with increasing in the aniline concentration and it is studied using the Stern-Volmer relation...
May 31, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28560476/erratum-to-x-ray-induced-and-thermostimulated-luminescence-of-new-fluorine-containing-compounds-potential-luminophores-scintillators-and-dosimeters
#19
Nina N Boroznovskaya, Maria M Godneva, Alexandra P Korneva, Anton V Klimkin
No abstract text is available yet for this article.
May 31, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28555407/effect-of-a-synthesized-amyl-glycine1-10-phenanthroline-platinum-nitrate-on-structure-and-stability-of-human-blood-carrier-protein-albumin-spectroscopic-and-modeling-approaches
#20
Zahra Shafaei, Omid Abazari, Adeleh Divsalar, Behafarid Ghalandari, Atefeh Poursoleiman, Ali Akbar Saboury, Faizan Ahmad
In the present study, biological evaluation of a new synthesized anti-cancer compound, amyl-glycine1, 10-phenanthroline Platinum nitrate (Pt(II) complex), was investigated at different temperatures by spectroscopic methods (far-UV circular dichroism (CD) and fluorescence) and modeling methods (docking and FRET). Human serum albumin (HSA), one of the vital proteins in drug delivery system in the body, was used as a target protein. The Pt(II) complex is able to quench the intrinsic fluorescence of HSA considerably...
May 29, 2017: Journal of Fluorescence
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