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Luminescence: the Journal of Biological and Chemical Luminescence

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https://read.qxmd.com/read/30746869/the-decomposition-of-triphenylimidazole-para-acetate-follows-specific-base-catalysis-and-can-be-conveniently-followed-by-fluorescence
#1
Roberta Albino Reis, Andreia Boaro, Ronaldo Barros Orfão, Diêgo Ulysses Melo, Fernando Heering Bartoloni
The kinetics of the decomposition reaction of 4-(4,5-diphenyl-1H-imidazol-2-yl)phenyl acetate (1) in basic alcoholic media was investigated, using a simple fluorescence (FL) spectrophotometric procedure. The process was conveniently studied using FL, since the triphenylimidazole-derived ester 1 and its reaction products (the corresponding phenol 2 and phenolate 2- ) are all highly fluorescent (ΦFL  > 37%). By carefully selecting excitation and emission wavelengths, observed rate constants k1 in the order of 10-3 to 10-2  s-1 were obtained from either reactant consumption (λex  = 300 nm, λem  = 400 nm) or product formation (λex  = 350 nm, λem  = 475 nm); these were shown to be kinetically equivalent...
February 11, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30746856/tld-characteristic-of-glass-feldspathic-and-lithium-disilicate-ceramics
#2
Esme Isik, Huseyin Toktamis
Thermoluminescence (TL) emission of dental ceramics could be potentially used for retrospective dosimetry purposes as this allows a quick and reliable dose assessment in case of nuclear accident or bad use of a nuclear attack. This paper reports on the chemical and luminescence characterization of glass, feldspathic and lithium disilicate glass ceramic (LS2 ). Swedish and Turkish dental ceramics supplied by Vivadent Ivoclar considering: (i) the dose response in the range 10 Gy to 6.9 kGy which displays a linear dose-response at low dose values up to 36 Gy (glass and feldspathic ceramics) and shows sublinear behavior from 12 Gy to 6 kGy (lithium disilicate glass ceramics), (ii) a reproducibility of the TL signal in which the area under the glow curve increased about 25% after 10 cycles for glass and lithium disilicate ceramics and increased about 30% after seven cycles for feldspathic ceramics, (iii) stability of the luminescence emission with the elapsed time and (iv) effect of the heating rate...
February 11, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30746849/copper-nanoclusters-an-efficient-fluorescence-sensing-platform-for-quinoline-yellow
#3
Unni Sivasankaran, Jerzy Radecki, Hanna Radecka, Krishnapillai Girish Kumar
Fluorescence quenching behavior of artificial food colorant quinoline yellow (QY), on interaction with l-cysteine stabilized copper nanoclusters (l-Cys-CuNCs) is investigated in this work. For this purpose, l-cysteine stabilized CuNCs were synthesized and characterized using various analytical techniques. Results demonstrated that the synthesized probe (size ~2 nm) had very promising optical features such as bright blue fluorescence, significant quantum yield and excellent photostability. l-Cys-CuNCs can function as a fluorescence sensor by selectively sensing QY among other yellow colorants, giving a detection limit as low as 0...
February 11, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30740868/prospects-for-using-a-new-sequential-chemiluminescence-strategy-for-monitoring-the-caffeine-content-in-soft-and-energy-drinks-via-the-catalytic-activities-of-different-nano-metal-oxides
#4
Nawal A Alarfaj, Salma A Al-Tamimi, Maha F El-Tohamy, Maha S Al-Dughmi
This article suggests a new sequential injection analysis chemiluminescence (SIA-CL) strategy for monitoring the caffeine (CAF) content in soft and energy drinks using the catalytic activities of different nano-metal oxides. The present study describes three different SIA-CL systems (luminol-ferricyanide (III) coupled with Fe2 O3 or ZnO nanoparticles (NPs), and luminol-H2 O2 coupled with CuONPs. All experimental conditions were optimized and the linear concentration ranges of pure CAF were evaluated using the calibration graphs...
February 10, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30740864/influence-of-ph-and-micellar-systems-on-the-sensitized-photo-oxidation-of-bovine-serum-albumin
#5
Eugenia Reynoso, R Daniel Cacciari, Carlos A Suchetti, Hernán A Montejano, M Alicia Biasutti
Photosensitized oxidation of bovine serum albumin (BSA), by using perinaphtenone as a sensitizer, has been studied at pH 7.4 and 11. The selected sensitizer does not present ground-state complexation with BSA and ensures that the mechanism is mediated by O2 (1 △g ). Strong dependence between BSA-O2 (1 △g ) photo-oxidation and the pH of the medium has been found. The relative oxygen uptake rate (v- △ O2 ) and the total quenching rate constant (kt ) values are higher at pH 11 than pH 7.4. The enhancement in the alkaline condition is due to conformational changes in the protein and the reactivity of tyrosinate anion with O2 (1 △g )...
February 10, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30734468/electrochemiluminescence-observing-the-surface-features-of-ru-doped-silica-nanoparticles-based-on-nanoparticle-ultramicroelectrode-collision
#6
Xiaoqin Lv, Min Li, Zhihui Guo, Xingwang Zheng
We present an innovative and sensitive electrogenerated chemiluminescence (ECL) strategy for observing the surface feature of a single silica nanoparticle based on its collision with an ultramicroelectrode (UME). As an ECL luminophore, Ru(bpy)3 2+ molecules are doped into silica nanoparticles. The stochastic collision events of Ru(bpy)3 2+ -doped silica nanoparticles (RuSNPs) can be tracked by observing the ECL 'blips' from the ECL reaction of Ru(bpy)3 2+ with a coreactant in solution. When RuSNPs collided with UME, Ru(bpy)3 2+ molecules that only exist near the collision site of silica nanoparticles (NPs) were electrochemically oxidized to form Ru(bpy)3 3+ , and then emitted light, because silica NPs are insulated...
February 7, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30724015/a-high-sensitivity-system-for-luminescence-measurement-of-materials
#7
Adrian A Finch, Yafang Wang, Peter D Townsend, Martin Ingle
A unique combined and multi-disciplinary wavelength multiplexed spectrometer is described. It is furnished with high-sensitivity imaging plate detectors, the power to which can be gated to provide time-resolved data. The system is capable of collecting spectrally resolved luminescence data following X-ray excitation [radioluminescence (RL) or X-ray excited optical luminescence (XEOL)], electron irradiation [cathodoluminescence (CL)] and visible light from light emitting diodes (LEDs) [photoluminescence (PL)]...
February 5, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30724008/determination-of-oxytetracycline-hydrochloride-in-milk-and-egg-white-samples-using-ru-bipy-3-2-ce-so-4-2-chemiluminescence
#8
Long Xing-Yu, Gong Jiang-Ning, Deng Mao, Wu Di, Chen Zhuo, Xia Pin-Hua, Gong Xiao-Jian, Deng Qin, Shi Zhi-Hui, Yan Xue-Mei, Tian Ru-Qing, Jiang Cai-Yun
A novel, rapid and sensitive chemiluminescence (CL) method for the determination of oxytetracycline hydrochloride (OTCH) is described in this paper. The presented method was based on the fact that OTCH could immensely enhance the CL of the reaction of cerium sulfate and tris(2,2-bipyridyl) ruthenium (II) in acidic medium. Under optimal experimental conditions, CL intensity was favorably linear for OTCH in the range 5.0 × 10-7 to 5.0 × 10-5  g/ml, with a detection limit of 1.5 × 10-7  g/ml (S/N = 3)...
February 5, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30724006/ultrasensitive-chemiluminescence-assay-for-cimetidine-detection-based-on-the-synergistic-improving-effect-of-au-nanoclusters-and-graphene-quantum-dots
#9
Ashraf Yousefzadeh, Jafar Abolhasani, Javad Hassanzadeh, Mohammad Hossein Somi
A novel and sensitive chemiluminescence (CL) procedure based on the synergetic catalytic effects of gold nanoclusters (Au NCs) and graphene quantum dots (GQDs) was developed for the reliable measurement of cimetidine (CM). The initial experiments showed that the KMnO4 -based oxidation of alkaline rhodamine B (RhoB) generated a very weak CL emission, which was intensively enhanced in the simultaneous presence of Au NCs and GQDs. CL intermediates can be adsorbed and gathered on the surface of Au NCs, becoming more stable...
February 5, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30723991/spectroscopic-characterization-calorimetric-study-and-molecular-docking-to-evaluate-the-bioconjugation-of-maltol-with-hemoglobin
#10
Lining Zhao, Hao Zhang, Jing Zhang, Wansong Zong, Rutao Liu
Maltol, a food additive, is extensively used in our daily life. To date, its biological safety is still debated. In this article, binding interaction of maltol with bovine hemoglobin (BHb), an important functional protein, was studied by molecular docking research and spectroscopic and calorimetric measurements. We found that maltol could cause structural changes of BHb. By interacting with Glu 101 (1.27 Å) and Lys 104 (2.49 Å) residues, maltol changed the cavity structure and induced a microenvironment change around tryptophan (Trp) residue...
February 5, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30714300/field-compatible-protocol-for-detecting-tetracyclines-with-bioluminescent-bioreporters-without-pipetting-steps
#11
Johanna Muurinen, Avinash Pasupulate, Juha Lappalainen, Marko Virta
Whole-cell bioreporters are living organisms and thus using them for detecting environmental contaminants would reflect biological effects of these pollutants. However, bioreporters are not widely used in field studies. Many of the bioreporter field protocols are suitable for liquid samples or include pipetting steps, which is a demanding task outside the laboratory. We present a bioreporter protocol without pipetting or sample type requirements. The protocol utilizes polyester swabs, commonly used in cleanroom technology...
February 3, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30706686/advances-in-optical-assays-for-detecting-telomerase-activity
#12
REVIEW
Bing Yang, Lu Shi, Jing Lei, Baoxin Li, Yan Jin
Telomerase uses its RNA as template and its protein unit as reverse transcriptase to synthesize TTAGGG repeats at the ends of the eukaryotic chromosome to maintain the lengths of telomeres. Telomerase activity up-regulates in about 85% of human tumors compared with somatic cells, which indicates that telomerase is a tumor biomarker. Reliable assay of telomerase activity is thus essential in diagnosis and management of malignant tumors. In this review, recent developed optical assays are summarized based on the readout signal, including chemiluminescence assay, colorimetric assay, and fluorescence assay...
January 31, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30706637/ultrasensitive-detection-of-glibenclamide-based-on-its-enhancing-effect-on-the-fluorescence-emission-of-cdte-quantum-dots
#13
Masoud Gazizadeh, Gholamreza Dehghan, Mohammad Amjadi
Glibenclamide (GB), as a sulfonylurea-based medication is commonly prescribed for the treatment of type 2 diabetes. Due to its increasing consumption, there is a need to develop a simple, fast, and reliable detection method to follow its concentration in pharmaceutical and biological samples. Herein, a novel fluorometric method is developed for the sensitive measurement of GB. The method is based on the enhancing effect of GB on the fluorescence emission of mercaptopropionic acid (MPA) capped cadmium telluride quantum dots (CdTe QDs)...
January 31, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30697953/structural-photoluminescence-and-dielectric-investigations-of-phosphatic-shale
#14
Pragya Pandit, Shailendra Kumar, Manoj Mohapatra, Pargin Bangotra, Rohit Mehra, A K Singh
In the current study, the structural and spectroscopic properties of phosphatic shale samples obtained from the Atomic Minerals Directorate for Exploration and Research were probed for potential use as a phosphor material. X-ray diffraction and Raman and Fourier transform infrared spectroscopy revealed that the beneficiated phosphatic shale samples were primarily monophasic consisting of fluorapatite [Ca5 (PO4 )3 F, (FAP)] with minor traces of haematite (α-Fe2 O3 ) and calcite (CaCO3 ). Energy dispersive X-ray fluorescence revealed the presence of U, Eu, Dy and Tb in the FAP matrix substituted at Ca(I) and Ca(II) sites of FAP...
January 29, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30697894/two-step-synthesis-and-luminescent-properties-of-bab-2-o-4-eu-3-nano-microphosphors-prepared-from-ba-b-o-eu-3-precursor
#15
Hongyan Zhang, Xiaoqin Feng, Wenjuan Zhang, Hongsheng Huang
The BaB2 O4 :Eu3+ nano/microphosphors with sphere-, rod-, and granular-like morphologies were successfully obtained by a two-step method using Ba-B-O:Eu3+ as the precursor. The structure, morphology and photoluminescent properties of the products were characterized by Fourier transfer infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and photoluminescence (PL). The formation mechanisms of Ba-B-O:Eu3+ and BaB2 O4 :Eu3+ were proposed...
January 29, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30690933/ratiometric-fluorescent-detection-of-cu-2-based-on-dual-emission-zif-8-rhodamine-b-nanocomposites
#16
Nan Liu, Juan Hao, Lili Chen, Yonghai Song, Li Wang
Zeolitic imidazolate framework-8 (ZIF-8) loading rhodamine-B (ZIF-8@rhodamine-B) nanocomposites was proposed and used as ratiometric fluorescent sensor to detect copper(II) ion (Cu2+ ). Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, nitrogen adsorption/desorption isotherms and fluorescence emission spectroscopy were employed to characterize the ZIF-8@rhodamine-B nanocomposites. The results showed the rhodamine-B was successfully assembled on ZIF-8 based on the π-π interaction and the hydrogen bond between the nitrogen atom of ZIF-8 and -COOH of rhodamine-B...
January 28, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30690847/electrochemiluminescent-functional-nucleic-acids-based-sensors-for-food-analysis
#17
REVIEW
Huifeng Xu, Xi Zhu, Jian Wang, Zhenyu Lin, Guonan Chen
Foodborne contaminants widely exist in foods, which can lead to various foodborne diseases and food safety issues. The development of quick, sensitive and universal analytical approaches for foodborne contaminants is imperative. Electrochemiluminescent functional nucleic acids (ECL FNAs)-based sensors are a series of sensing devices using FNAs as the recognition elements and ECL as the transducer. Contributing to the specific recognition ability of FNA and the high sensitivity of ECL, ECL FNA-based sensors are considered to be of great application potential for foodborne contaminants monitoring...
January 28, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30680910/high-quantum-yield-and-well-dispersed-quantum-dots-luminescent-composite-through-sodium-carboxymethyl-starch
#18
Cui Liu, Yang Liu, Heming Deng, Shun Tang, Yuan-Cheng Cao
It is a challenging task to prepare well-dispersed and highly luminescent quantum dots (QDs) powder and a new strategy is reported in this article. Sodium carboxymethyl starch (CMS-Na) was employed in this work to prepare the QDs-starch composite. Ultraviolet (UV) light shows that the blank starches had no fluorescence, while the QDs-starches were highly luminescent. Scanning electron microscopy (SEM) observation shows that the QDs-starch composite has the typical particle morphology with the diameter around 200 nm...
January 24, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30675979/light-emission-from-the-fe-2-edta-ascorbic-acid-h-2-o-2-system-strongly-enhanced-by-plant-phenolic-acids
#19
Michal Nowak, Wiesław Tryniszewski, Agata Sarniak, Anna Włodarczyk, Piotr J Nowak, Dariusz Nowak
Oxidative reactions can result in the formation of electronically excited species that undergo radiative decay depending on electronic transition from the excited state to the ground state with subsequent ultra-weak photon emission (UPE). We investigated the UPE from the Fe2+ -EDTA (ethylenediaminetetraacetic acid)-AA (ascorbic acid)-H2 O2 (hydrogen peroxide) system with a multitube luminometer (Peltier-cooled photon counter, spectral range 380-630 nm). The UPE, of 92.6 μmol/L Fe2+ , 185.2 μmol/L EDTA, 472 μmol/L AA, 2...
January 24, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/30675977/a-simple-fret-system-using-two-color-cdte-quantum-dots-assisted-by-cetyltrimethylammonium-bromide-and-its-application-to-hg-ii-detection
#20
Jing Wang, Fengjuan Song, Yongling Ai, Shanwen Hu, Zhizhou Huang, Wenying Zhong
In this study, we developed a novel simple fluorescence resonance-energy transfer (FRET) system between two-color CdTe quantum dots (QDs) assisted by cetyltrimethylammonium bromide (CTAB). Mercaptopropionic (MPA)-capped CdTe QDs serving as both donors and acceptors were successfully synthesized by changing the refluxing time in aqueous solution. CTAB micelles formed in water and minimized the distance between the donors and acceptors significantly by electrostatic interactions, improving FRET efficiency. Several factors that affected the fluorescence spectra of the FRET system were investigated...
January 24, 2019: Luminescence: the Journal of Biological and Chemical Luminescence
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