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Journal of Fluorescence

Gulsiye Ozturk Urut, Seher Aydin, Derya Topkaya, Elif Sahin, Serap Alp
New fluorescent thiophenyl group containing oxazol-5-one fluorophores of 3a (4-(3-thiophenylmethylene)-2-phenyloxazol-5-one), 3b (4-(3-thiophenylmethylene)-2-(4-tolyl)oxazol-5-one) and 3c (4-(3-thiophenylmethylene)-2-(4-nitrophenyl)oxazol-5-one) were synthesized and characterized. The newly synthesized oxazol-5-ones absorption and fluorescence characteristics were studied in some solvents of varying polarities. The heterocyclic chromophores were fluorescent, with two of them, 3a and 3b, emitting blue light, whilst the other one, 3c, emitting green light...
May 21, 2018: Journal of Fluorescence
Kunjie Wang, Qingjuan Ji, Jialin Xu, Hongxia Li, Deyi Zhang, Xiaoyu Liu, Yujuan Wu, Haiyan Fan
In the present work, we synthesized the carbon quantum dots (CQDs) by one step hydrothermal method using the dried beet powder as the carbon source without additional chemical reagents and functionalization. The as-prepared CQDs are quasi-spherical carbon nanoparticles with diameters of 4-8 nm as well as surface functional groups such as carboxyl and hydroxyl groups, and exhibit good water-solubility, biocompatibility, and strong fluorescence. It is confirmed that amoxicillin (AMO) could enhance the fluorescent intensity of CQDs, the I/I 0 showed a linear correlation between the intensity of fluorescence and the concentration of AMO in a broad range...
May 19, 2018: Journal of Fluorescence
Abeer N Al-Romaizan, Mahmoud A Hussein
A new candidate laser dye based 1,4-bis[β-(2-naphthothisolyl) vinyl] benzene (BNTVB) were prepared, and characterized in various organic solvents. The center polarity is less sensitive than electronic absorption. A red shift was noticed in the fluorescence spectra (ca. 40 nm) with increment in the solvent's polarity, this means that BNTVB's polarity appreciates upon excitation. The dipole moment of ground state (μg ) and the excited singlet state dipole moment (μe ) are determined from Kawski - Chamma and Bakshiev-Viallet equations using the disparity of Stokes shift with solvent polarity function of ε (dielectric constant) and n (refractive index) of the solvent...
May 12, 2018: Journal of Fluorescence
Xueding Wang, Yilian Xu, Lu Yang, Xiang Lu, Hao Zou, Weiqing Yang, Yuanyuan Zhang, Zicheng Li, Menglin Ma
A series of 1,3,5-triazines were synthesized and their UV absorption properties were tested. The computational chemistry methods were used to construct quantitative structure-property relationship (QSPR), which was used to computer aided design of new 1,3,5-triazines ultraviolet rays absorber compounds. The experimental UV absorption data are in good agreement with those predicted data using the Time-dependent density functional theory (TD-DFT) [B3LYP/6-311 + G(d,p)]. A suitable forecasting model (R > 0...
May 2, 2018: Journal of Fluorescence
Deborah S Keller, Richard Boulton, Manuel Rodriguez-Justo, Richard Cohen, Manish Chand
Here, we report on the feasibility of ICG fluorescence imaging to localize lesions in emergent minimally invasive surgery. A 49-year old female presented to the emergency department with a previously unknown malignant bowel obstruction. She was taken emergently to the operating room for a laparoscopic extended right hemicolectomy, based on tumor location from imaging. With intraoperative difficulty localizing the lesion, an on-table colonoscopy was performed. When the tumor was encountered, peritumoral ICG injections were performed, and the fluorescence lymphoscintigraphy was performed intraoperatively in an attempt to visualize the primary tumor laparoscopically...
April 26, 2018: Journal of Fluorescence
Nan Zhang, Baoli Dong, Xiuqi Kong, Chao Wang, Wenhui Song, Weiying Lin
Hydrogen peroxide (H2 O2 ) plays important roles in the regulation of many biological processes, and the abnormal level of H2 O2 has close relation with the initiation and progression of many diseases. Herein, we describe a novel red-emissive fluorescence probe (RhoB) for the visualization of H2 O2 in living cells, tissues and animals. RhoB was constructed on the basis of a xanthene-based red-emissive dye, and displayed nearly no fluorescence. After the treatment with H2 O2 , RhoB can exhibit red fluorescence with the emission wavelength at 638 nm...
April 25, 2018: Journal of Fluorescence
N A Maslov
A simple two-component model is worked out to investigate pulsed laser-induced fluorescence in complex organic samples, like biological tissues, optically thick at the excitation wavelength. Expression for emitted fluorescence signal is obtained. Saturation process is shown to be determined not only by fluorophores excited by the laser, but non-fluorescent chromophores with overlapping absorption band as well. For homogeneous samples the forms of saturation curves are determined by fluorophore's features. Experimental saturation curves of bulk paper and mice tissues ultraviolet pulsed laser-induced fluorescence are discussed considering this model...
April 25, 2018: Journal of Fluorescence
Yaser Ghazi, Akbar Vaseghi, Sepideh Ahmadi, Fatemeh Haddadi
Gene expression analysis is considered to be extremely important in many different biological researches. DNA-based diagnostic test, which contributes to DNA identification, has higher specificity, cost, and speed than some biochemical and molecular methods. In this study, we try to use the novel nano technology approach with Multiplex RT-PCR and Gold nano particular probes (GNPs-probes) in order to get gene expression in Curcumas melons. We used Agrobacterium tumefactions for gene transfer and GUS reporter gene as a reporter...
April 23, 2018: Journal of Fluorescence
Qianxia Pan, Zihui He, Dongdong Xia, Xiaomin Gu, Haibo Wang, Jie Sun
Succinylcholine Chloride (SCC), a short-acting neuromuscular relaxant, is non-fluorescent in aqueous solutions. This property makes it impossible to be determined by direct fluorescent method. Naphthalimide dye (NA) exhibits very strong fluorescence emissions in aqueous solution, after complexing with carboxylatopillar[5]arene (CP5A) in aqueous solutions, the fluorescent quenched intensity of complex was observed. On the contraty, stilbazolium dye (SA) exhibits weak fluorescence emissions in aqueous solution, after being included by CP5A, a fluorescence enhancement was observed...
April 23, 2018: Journal of Fluorescence
Alexander A Ksenofontov, Galina B Guseva, Svetlana A Stupikova, Elena V Antina
In this paper, we report on the results of spectrofluorimetric study of new fluorescent sensor based on [Zn2 L2 ] doped in ethyl cellulose. The sensor optical signal is based on the rapid fluorescence quenching in the presence of acetone vapor. The acetone vapor detection limit in a gas mixture by means of sensor based on [Zn2 L2 ] doped in ethyl cellulose is 1.68 ppb. Being highly sensitive to the acetone acetone presence, instant in response and easy to use, the sensor can find an application for the noninvasive diagnostics of diabetes as well as for the monitoring of the content of acetone acetone in the air at industrial and laboratory facilities...
April 23, 2018: Journal of Fluorescence
Chia-Hsiu Chen, Kenichi Tanaka, Kimito Funatsu
The Quantitative Structure - Property Relationship (QSPR) approach was performed to study the fluorescence absorption wavelengths and emission wavelengths of 413 fluorescent dyes in different solvent conditions. The dyes included the chromophore derivatives of cyanine, xanthene, coumarin, pyrene, naphthalene, anthracene and etc., with the wavelength ranging from 250 nm to 800 nm. An ensemble method, random forest (RF), was employed to construct nonlinear prediction models compared with the results of linear partial least squares and nonlinear support vector machine regression models...
April 22, 2018: Journal of Fluorescence
Mohammad M Ibrahim, Mahmoud Al-Refai, Abdullah Al-Fawwaz, Basem F Ali, Armin Geyer, Klaus Harms, Michael Marsch, Michelle Krüger, Hasnah Osman, Mohamad N Azmi
Furopyridine III, namely 1-(3-amino-4-(4-(tert-butyl)phenyl)-6-(p-tolyl)furo[2,3-b]pyridin-2-yl)ethan-1-one, synthesized from 4-(4-(tert-butyl)phenyl)-2-oxo-6-(p-tolyl)-1,2-dihydropyridine-3-carbonitrile I in two steps. The title compound is characterized by NMR, MS and its X-ray structure. The molecular structure consists of planar furopyridine ring with both phenyl rings being inclined from the furopyridine scaffold to a significant different extent. There are three intramolecular hydrogen bonds within the structure...
April 21, 2018: Journal of Fluorescence
Tonmoy Ghosh, Apeksha Vyas, Khushbu Bhayani, Sandhya Mishra
C-phycoerythrin (CPE) was investigated as a colorimetric and fluorometric quantitative sensor for Cu2+ ions in an aqueous medium. UV - visible studies with 50 μM concentration of different metals were carried out with only Cu and Ag showing changes in the absorption spectra. Fluorescence emission studies showed similar results. UV - visible titration of CPE with different [Cu] resulted in a linear relationship within 10 μM Cu and a 'naked eye' visible difference in colour, most likely due to the formation of a CPE - Cu complex...
April 18, 2018: Journal of Fluorescence
Ganesan Punithakumari, Shu Pao Wu, Sivan Velmathi
So far, very few numbers of chemosensors for Cr3+ ion have been reported. However, the main drawback of reported receptors are the lack of selectivity and other trivalent cations such as Fe3+ , Al3+ and anions like F- and - OAc frequently interfere with such assays. This paper present the synthesis, characterization & sensor studies of Schiff base containing naphthalene moiety which selectively detect Cr3+ ion by chemodosimetric approach. Using FT-IR, 1 H NMR, 13 C NMR and ESI mass spectroscopic techniques the probe was characterized...
April 14, 2018: Journal of Fluorescence
Amol G Jadhav, Suvidha S Shinde, Nagaiyan Sekar
Synthesis of three novel phenyl(1H-benzoimidazol-5-yl)methanone based fluorescent monoazo disperse dyes and their characterization by spectroscopic methods (1 H NMR,13 C NMR, IR and MS) are presented. Insertion of phenyl(1H-benzoimidazol-5-yl)methanone moiety bring about induced fluorescence properties and enhanced photostability as compared to the previously reported analogues (CI Solvent Yellow 14, 4-diethylamino-2-hydroxy-1-diazobenzene and 7-(diethylamino)-4-hydroxy-3-(phenyldiazenyl)-2H-chromen-2-one)...
April 4, 2018: Journal of Fluorescence
Olivia Stiehl, Andreas Veres, Matthias Weiss
Monitoring the response of cells to environmental challenges, e.g. after exposure to oxidative stress or pharmaceutical substances, not only provides clues for fundamental biological processes but can also serve as a valuable tool in drug development. Obtaining such insights on the subcellular level in a rapid and simple manner is therefore of major importance. Ideally, such an approach not only reports on compartment-specific responses but also allows for an inherent subcellular segmentation using the same data set...
April 3, 2018: Journal of Fluorescence
Andrzej J Kałka, Andrzej M Turek
'White' and 'grey' methods of data modeling have been employed to resolve the heterogeneous fluorescence from a fluorophore mixture of 9-cyanoanthracene (CNA), 10-chloro-9-cyanoanthracene (ClCNA) and 9,10-dicyanoanthracene (DCNA) into component individual fluorescence spectra. The three-component spectra of fluorescence quenching in methanol were recorded for increasing amounts of lithium bromide used as a quencher. The associated intensity decay profiles of differentially quenched fluorescence of single components were modeled on the basis of a linear Stern-Volmer plot...
April 3, 2018: Journal of Fluorescence
Keshav Kumar
Excitation-emission matrix fluorescence (EEMF) and total synchronous fluorescence spectroscopy (TSFS) are the 2 fluorescence techniques that are commonly used for the analysis of multifluorophoric mixtures. These 2 fluorescence techniques are conceptually different and provide certain advantages over each other. The manual analysis of such highly correlated large volume of EEMF and TSFS towards developing a calibration model is difficult. Partial least square (PLS) analysis can analyze the large volume of EEMF and TSFS data sets by finding important factors that maximize the correlation between the spectral and concentration information for each fluorophore...
March 29, 2018: Journal of Fluorescence
Mufeed Maghrabi, Tariq Al-Abdullah, Ziad Khattari
The two heating rates method (originally developed for first-order glow peaks) was used for the first time to evaluate the activation energy (E) from glow peaks obeying mixed-order (MO) kinetics. The derived expression for E has an insignificant additional term (on the scale of a few meV) when compared with the first-order case. Hence, the original expression for E using the two heating rates method can be used with excellent accuracy in the case of MO glow peaks. In addition, we derived a simple analytical expression for the MO parameter...
March 24, 2018: Journal of Fluorescence
Yang Zhang, Yang Wang, Wei-Wei Cao, Ke-Tao Ma, Wei Ji, Zi-Wei Han, Jun-Qiang Si, Li Li
Significant autofluorescence (AF) of renal tissue is one of the major causes restricting the use of immunofluorescent staining. This study aimed at controlling renal tissue AF and testing an effective method for optimizing specific signals. In the present study, we observed emergence of strong AF in all renal cells under different fluorescent channels. Significant concentration-dependent reduction in AF of kidney tissue was observed with the use of sodium borohydride (NaBH4 ) and Sudan black B (SBB) alone (p < 0...
March 20, 2018: Journal of Fluorescence
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