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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/29350441/ultrasensitive-detection-of-shiga-toxin-2-and-its-variants-in-shiga-toxin-producing-escherichia-coli-strains-by-a-time-resolved-fluorescence-immunoassay
#1
Tian Wen, Chao Huang, Yi Zhang, Xiaoyan Zeng, Wendong Liu, Zhenbang Jiao, Xiling Guo, Yongjun Jiao
A rapid and sensitive two-step time-resolved fluorescence immunoassay (TRFIA) was developed for the detection of Shiga toxin 2 (Stx2) and its variants in Shiga toxin-producing Escherichia coli (STEC) strains. In sandwich mode, a monoclonal antibody against Stx2 was coated on a microtiter plate as a capture antibody. A tracer antibody against Stx2 labeled with europium(III) (Eu3+ ) chelate was then used as a detector, followed by fluorescence measurements using time-resolved fluorescence. The sensitivity of Stx2 detection was 0...
January 19, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29341425/synthesis-of-novel-dy3-activated-ba2-cazn2-si6-o17-phosphors-for-white-light-emitting-diodes
#2
G Annadurai, S Masilla Moses Kennedy, V Sivakumar
Dysprosium ion (Dy3+ ) activated Ba2 CaZn2 Si6 O17 phosphors were synthesized using high temperature solid-state reaction method. Powder X-ray diffraction (PXRD) analysis confirmed the phase formation of the as-prepared phosphors. Scanning electron microscopy (SEM) analysis disclosed an agglomeration of particles with an irregular morphology. Under 350 nm excitation, the emission spectrum of Dy3+ ions showed bands at 481 nm (blue), 577 nm (yellow) and 674 nm (red). The influence of the Dy3+ concentration on its emission intensity was investigated...
January 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29341422/synthesis-and-luminescence-properties-of-cubic-shaped-ca1-x-tio3-eu3-particles
#3
Shang Zhou, Hua Wang, Li Zhong, Guanghai Li
In this article Ca1-x TiO3 :xEu3+ single crystalline particles with a cubic morphology and average size of 248 to 815 nm were synthesized by a solvothermal method. The structural and optical properties of the Ca1-x TiO3 :xEu3+ cubes were investigated, the formation mechanism of the cubes were analyzed and discussed, and the influence of Eu doping content and cubic size on the photoluminescence were examined. The differences in the photoluminescence between Ca1-x TiO3 :xEu3+ cubic crystals and nanoparticles was analyzed...
January 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29336102/behavioural-responses-of-the-yellow-emitting-annelid-tomopteris-helgolandica-to-photic-stimuli
#4
Anaïd Gouveneaux, Marie-Charlotte Gielen, Jérôme Mallefet
In contrast to most mesopelagic bioluminescent organisms specialised in the emission and reception of blue light, the planktonic annelid Tomopteris helgolandica produces yellow light. This unusual feature has long been suggested to serve for intraspecific communication. Yet, this virtually admitted hypothesis has never been tested. In this behavioural study of spectral colour sensitivity, we first present an illustrated repertoire of the postures and action patterns described by captive specimens. Then video tracking and motion analysis are used to quantify the behavioural responses of singled out worms to photic stimuli imitating intraspecific (yellow) or interspecific (blue) bioluminescent signals...
January 16, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29327457/solvatochromic-study-of-3-n-n-methylacetamidino-benzanthrone-and-its-interaction-with-dopamine-by-the-fluorescence-quenching-mechanism
#5
D Bharathi, B Siddlingeshwar, Shivraj, Anup Thomas, Elena M Kirilova, Irena Nikolajeva
The change in photophysical properties of the organic molecule due to solvatochromic effect caused by different solvent environments at room temperature gives information about the dipole moments of 3-N-(N'-methylacetamidino)benzanthrone (3-MAB). The quantum yield, fluorescence lifetime of 3-MAB was measured in different solvents to calculate radiative and non-radiative rate constants. The results revealed that the excited state dipole moment (μe ) is relatively larger compared to the ground state dipole moment (μg ), indicating the excited state of the dye under study is more polar than the ground state and the same trend is noticed with theoretical calculations performed using the CAM-B3LYP/6-311+G(d,p) method...
January 12, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29327404/a-novel-red-emitting-phosphor-libab9-o15-sm2-sm3-li-with-broad-excitation-band-for-white-leds
#6
Ting Li, Zhijun Wang, Panlai Li, Shuchao Xu, Qiongyu Bai, Zhiping Yang
A novel tunable red emitting phosphor LiBaB9 O15 :Sm2+ /Sm3+ , Li+ with broad excitation band was synthesized by a high temperature solid-state method. Luminescence properties were investigated in detail by luminescence, X-ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity coordinates. XPS data confirmed that there were Sm3+ in LiBaB9 O15 :Sm3+ and Sm2+ /Sm3+ in LiBaB9 O15 :Sm2+ /Sm3+ , respectively. Spectral property of LiBaB9 O15 :Sm3+ , LiBaB9 O15 :Sm3+ /Sm2+ and LiBaB9 O15 :Sm2+ , Li+ presented that the excitation band of Sm3+ widened and the excitation band of Sm2+ ranged from 350 to 450 nm...
January 12, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29316170/luminescence-of-lemon-derived-carbon-quantum-dot-and-its-potential-application-in-luminescent-probe-for-detection-of-mo6-ions
#7
Bui Thi Hoan, Pham Van Huan, Hoang Nhu Van, Duy Hung Nguyen, Phuong Dinh Tam, Khoi Thi Nguyen, Vuong-Hung Pham
This article reports on the first attempt of a systematic study on the synthesis of carbon dots (C-dots) for the potential applications in labeling and detection of molybdenum ion (Mo6+ ). Carbon dots (C-dots) were synthesized directly via a simple hydrothermal method using lemon juices as carbon precursor with different temperatures to control the luminescence of C-dots. The obtained C-dots had strong green light emission and the ability to use its luminescence properties as probes for Mo6+ detection application, which is based on Mo6+ induced luminescence quenching of C-dots...
January 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29316167/effect-of-cacn2-on-the-preparation-of-caalsin3-eu2-phosphors
#8
Lin-Jiu Xiao, Yan Lv, Ying Xie, Jian Su, Xin-Dong Jiang, Ming-Rui He
Highly efficient red-emitting phosphors, CaAlSiN3 :Eu2+ , were successfully prepared by the solid-state method using calcium cyanide (CaCN2 ) as the single calcium source. The influences of crystallization temperature, crystallization time, calcination mode and compounds ratio on the photoluminescent properties were investigated. The CaAlSiN3 :Eu2+ phosphors were obtained with 1 mol% CaCN2 by a two-step calcination procedure at 900°C for 2 h and subsequently at 1600°C for 8 h. The CaAlSiN3 :Eu2+ phosphors showed the strongest luminescent intensity at 660 nm when excited by 468 nm...
January 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29316160/luminescence-properties-of-tm3-ions-single-doped-yf3-materials-in-an-unconventional-excitation-region
#9
Yuan Chen, Qing Liu, Han Lin, Xiaohong Yan
According to the spectral distribution of solar radiation at the earth's surface, under the excitation region of 1150 to 1350 nm, the up-conversion luminescence of Tm3+ ions was investigated. The emission bands were matched well with the spectral response region of silicon solar cells, achieved by Tm3+ ions single-doped yttrium fluoride (YF3 ) phosphor, which was different from the conventional Tm3+ /Yb3+ ion couple co-doped materials. Additionally, the similar emission bands of Tm3+ ions were achieved under excitation in the ultraviolet region...
January 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29314579/effect-of-triazole-tryptophan-hybrid-on-the-conformation-stability-of-bovine-serum-albumin
#10
Babita Aneja, Meena Kumari, Amir Azam, Amit Kumar, Mohammad Abid, Rajan Patel
The effect of a potent antimicrobial compound bearing 1,2,3-triazole core and a tryptophan tail, triazole-tryptophan hybrid (TTH), with bovine serum albumin (BSA) have been explored using various spectroscopic and molecular docking methods. Studies revealed that TTH strongly quenches the intrinsic fluorophore of BSA by a static quenching mechanism. Time-resolved fluorescence spectra further confirmed the involvement of static quenching for TTH-BSA system. The calculated thermodynamic parameters; ΔH, ΔS, and ΔG showed that the binding process was spontaneous, exothermic and entropy driven...
January 5, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29314497/full-analytical-evaluation-of-the-line-shift-and-line-width-of-ions-in-solids-for-raman-processes
#11
Erhan Eser, Hüseyin Koç
In this paper, we present a new analytical method to evaluate the temperature dependence of the thermal line shift and thermal line width of spectral lines in the Raman process using a simple approximation for the Debye functions. The proposed formulae guarantee the accurate and fast calculation of the thermal line shift and thermal line width. As an example of application, the analytical expression obtained is used to calculate the line shift and line width of the 2 E → 4 A2 transitions in V2+ :MgO at temperatures from 0 K up to 500 K...
January 5, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29282896/rapid-controllable-one-pot-and-room-temperature-aqueous-synthesis-of-zno-cu-nanoparticles-by-pulsed-uv-laser-and-its-application-for-photocatalytic-degradation-of-methyl-orange
#12
Mozhgan Arabi, Seyyed Mahdy Baizaee, Alireza Bahador, Seyed Mohammad Taheri Otaqsara
Zinc oxide (ZnO) and ZnO:Cu nanoparticles (NPs) were synthesized using a rapid, controllable, one-pot and room-temperature pulsed UV-laser assisted method. UV-laser irradiation was used as an effective energy source in order to gain better control over the NPs size and morphology in aqueous media. Parameters effective in laser assisted synthesis of NPs such as irradiation time and laser shot repetition rate were optimized. Photoluminescence (PL) spectra of ZnO NPs showed a broad emission with two trap state peaks located at 442 and 485 nm related to electronic transition from zinc interstitial level (IZn ) to zinc vacancy level (VZn ) and electronic transition from conduction band to the oxygen vacancy level (VO ), respectively...
December 28, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29282888/comprehensive-study-of-interaction-between-biocompatible-peg-inp-zns-qds-and-bovine-serum-albumin
#13
M S Sannaikar, Laxmi S Inamdar, G H Pujar, M N Wari, Nafisa H Balasinor, S R Inamdar
Polyethylene glycol (PEG) surface modified biocompatible InP/ZnS quantum dots (QDs) act as a potential alternative for conventional carcinogenic cadmium-based quantum dots for in vivo and in vitro studies. Comprehensively, we studied the interaction between a model protein bovine serum albumin (BSA) and PEGylated toxic free InP/ZnS QDs using various spectroscopic tools such as absorption, fluorescence quenching, time resolved and synchronous fluorescence spectroscopic measurements. These studies principally show that tryptophan (Trp) residues of BSA have preferable binding affinity towards PEG-InP/ZnS QDs surface and a blue shift in Trp fluorescence emission is a signature of conformational changes in its hydrophobic microenvironment...
December 28, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29282869/emission-analysis-of-tb3-and-sm3-ion-doped-li2-o-na2-o-k2-o-and-li2-o-na2-o-li2-o-k2-o-k2-o-na2-o-modified-borosilicate-glasses
#14
B Naveen Kumar Reddy, S Sailaja, K Thyagarajan, Young Dahl Jho, B Sudhakar Reddy
Four series of borosilicate glasses modified by alkali oxides and doped with Tb3+ and Sm3+ ions were prepared using the conventional melt quenching technique, with the chemical composition 74.5B2 O3 + 10SiO2 + 5MgO + R + 0.5(Tb2 O3 /Sm2 O3 ) [where R = 10(Li2 O /Na2 O/K2 O) for series A and C, and R = 5(Li2 O + Na2 O/Li2 O + K2 O/K2 O + Na2 O) for series B and D]. The X-ray diffraction (XRD) patterns of all the prepared glasses indicate their amorphous nature. The spectroscopic properties of the prepared glasses were studied by optical absorption analysis, photoluminescence excitation (PLE) and photoluminescence (PL) analysis...
December 28, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29271102/high-performance-liquid-chromatography-study-of-gatifloxacin-and-sparfloxacin-using-erythrosine-as-post-column-resonance-rayleigh-scattering-reagent-and-mechanism-study
#15
Ziyu Pan, Jingdong Peng, Xu Zang, Huanjun Peng, Huan Xiao, Lingli Bu, Fang Chen, Yan He, Yu Chen, Xiang Wang, Shiyu Li, Yi Chen
Herein, a highly selective high-performance liquid chromatography (HPLC) coupled with resonance Rayleigh scattering (RRS) method was developed to detect gatifloxacin (GFLX) and sparfloxacin (SPLX). GFLX and SPLX were first separated by HPLC, then, in pH 4.4 Britton-Robinson (BR) buffer medium, protonic quaternary ammonia cation of GFLX and SPLX reacted with erythrosine (ERY) to form 1:1 ion-association complexes, which resulted in a significant enhancement of RRS signal. The experimental conditions of HPLC and post-column RRS have been investigated, including detection wavelength, flow rate, pH, reacting tube length and reaction temperature...
December 22, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29251407/exploration-of-interaction-of-canthaxanthin-with-human-serum-albumin-by-spectroscopic-and-molecular-simulation-methods
#16
Jie Jia, Yuxian Wang, Yueying Liu, Yuhong Xiang
The interaction between the food colorant canthaxanthin (CA) and human serum albumin (HSA) in aqueous solution was explored by using fluorescence spectroscopy, three-dimensional fluorescence spectra, synchronous fluorescence spectra, UV-vis absorbance spectroscopy, circular dichroism (CD) spectra and molecular docking methods. The thermodynamic parameters calculated from fluorescence spectra data showed that CA could result in the HSA fluorescence quenching. From the KSV change with the temperature dependence, it was concluded that HSA fluorescence quenching triggered by CA is the static quenching and the number of binding sites is one...
December 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29235238/study-of-the-controlled-assembly-of-dna-gated-pei-chitosan-sio2-fluorescent-sensor
#17
Zheng Chang, Yinghao Mi, Xingwang Zheng
In this paper, polyethylenimine (PEI) and Chitosan were simultaneously one-step doped into silicon dioxide (SiO2 ) nanoparticles to synthesize PEI/Chitosan/SiO2 composite nanoparticles. The polymer PEI contained a large amount of amino groups, which can realize the amino functionalized SiO2 nanoparticles. And, the good pore forming effect of Chitosan was introduced into SiO2 nanoparticles, and the resulting composite nanoparticles also had a porous structure. In pH 7.4 phosphate buffer solution (PBS), the amino groups of PEI had positive charges, and therefore the fluorescein sodium dye molecule can be loaded into the channels of PEI/Chitosan/SiO2 composite nanoparticles by electrostatic adsorption...
December 12, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29235233/sodium-4-mercaptophenolate-capped-cdse-zns-quantum-dots-as-a-fluorescent-probe-for-ph-detection-in-acidic-aqueous-media
#18
Hu Xu, Dong Li, Yun Zhao, Xiaomei Wang, Dan Li, Yuhong Wang
Development of the fluorescent pH detection method is promising due to the sensitivity, easy operation, and low-cost, etc. However, traditional organic fluorophores have still some disadvantages such as the tedious preparation and purification as well as low photostability and water solubility, which limits the rapid detection application. Semiconductor quantum dots (QDs) have recently risen to prominence as an alternative for organic fluorophores in fluorescence analysis by virtue of their convenient synthesis and superior optical properties...
December 12, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29178666/luminescent-studies-of-binuclear-ternary-europium-iii-pyridineoxide-tetrazolate-complexes-containing-bis-phosphine-oxide-as-auxiliary-co-ligands
#19
Suraj Mal, Marek Pietraszkiewicz, Oksana Pietraszkiewicz
A new class of antenna chromophores so called 'tetrazolates' have not been explored much for lanthanide luminescencent complexes. However, we have already published several articles considering pyridineoxide tetrazolates as sensitizer with lanthanide ions. Although this class of antenna attracted much less attention because of its poor photoluminescence quantum yields (tris-pyridineoxide tetrazolate europium complex = 13% in solution) we tried and successfully achieved to improve the photoluminescence quantum yields for this particular antenna molecule by replacing coordinated water from the inner coordination sphere of europium ion by introducing phosphine oxides as additional chromophore...
November 27, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29178530/photoluminescent-properties-of-eu3-eu2-activated-mal2-six-o2x%C3%A2-%C3%A2-4-m%C3%A2-%C3%A2-mg-ca-sr-ba-phosphors-prepared-in-air
#20
Songchu Li, Lixin Yu, Xiaoqin Man, Jianlin Zhong, Wei Sun
In this paper, MAl2 Six O2x+4 :Eu2+ /Eu3+ (Eu2+ + Eu3+ = 2%, molar ratio; M = Mg, Ca, Sr, Ba; x = 0, 0.5, 1, 1.5, 2) phosphors with different SiO2 concentrations (the ratio of SiO2 to MAl2 O4 is n%, n = 0, 50, 100, 150, 200, respectively) were prepared by high-temperature solid-state reaction under atmospheric air conditions. Their structures and photoluminescent properties were systematically researched. The results indicate that Eu3+ ions have been reduced and Eu2+ ions are obtained in air through the self-reduction mechanism...
November 27, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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