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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/28303653/utility-of-hantzsch-reaction-for-development-of-highly-sensitive-spectrofluorimetric-method-for-determination-of-alfuzosin-and-terazosin-in-bulk-dosage-forms-and-human-plasma
#1
Mohamed A Hammad, Mahmoud A Omar, Baher I Salman
A highly sensitive, cheap, simple and accurate spectrofluorimetric method has been developed and validated for the determination of alfuzosin hydrochloride and terazosin hydrochloride in their pharmaceutical dosage forms and in human plasma. The developed method is based on the reaction of the primary amine moiety in the studied drugs with acetylacetone and formaldehyde according to the Hantzsch reaction, producing yellow fluorescent products that can be measured spectrofluorimetrically at 480 nm after excitation at 415 nm...
March 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28300358/a-highly-selective-colorimetric-and-fluorescent-dual-modal-probe-for-the-rapid-determination-of-fluoride-anions
#2
Changsuo Li, Chengcheng Tang, Liting Xing, Bin Sun, Shiyu Cheng, Qiang Liao, Baocun Zhu
In this work, 4-(p-hydroxybenzylidenehydrazino)-N-butyl-1,8-naphthalimide (1) has been designed and synthesized as a colorimetric and fluorescent dual-modal probe for F(-) . Compound 1 immediately detected inorganic fluoride salts using UV/vis absorption and fluorescence spectroscopy methods, and served as a 'naked-eye' indicator for F(-) with high selectivity and sensitivity. Both the absorption and fluorescence spectra show excellent linearity with the concentration of F(-) . Real-life applications demonstrated that our proposed analytical system provided a satisfactory method for the determination of F(-) ...
March 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28296141/differentiation-between-sources-of-mechanoluminescence-and-acoustic-emission-in-impact-loaded-znse-and-zns-ceramics
#3
Alexandre Chmel, Anatolij Dunaev, Igor Shcherbakov
Ductile semiconductor ceramics ZnSe and ZnS were damaged by a falling weight, and the time series of mechanoluminescence (ML) and acoustic emission (AE) pulses were recorded with the nanosecond resolution. The ML lighting appeared in the instance of shock but the AE generation emerged with a delay of 50-100 μsec; however, the maxima of the light and sound emissions coincided in time. This difference in temporal profiles was explained by the difference in prevailing sources of emissions of two types. The detected luminescence in A2 B6 compounds was excited, mainly, by moving and multiplying dislocations, while the sound was generated by nucleating and growing cracks...
March 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28296058/a-comparison-between-the-larval-eyes-of-the-dimly-luminescent-keroplatus-nipponicus-and-the-brightly-luminescent-arachnocampa-luminosa-diptera-keroplatidae
#4
V Benno Meyer-Rochow, Yumi Yamahama
Larvae of the weakly blue-luminescent fungus gnat Keroplatus nipponicus possess on either side of their heads a small black stemmatal eye with a plano-convex lens approximately 25 μm in diameter. In total, 12-14 retinula cells give rise to a centrally fused rhabdom of up to 8 μm in diameter. The rhabdom's constituent microvilli, approximately 70 nm in width, are roughly orthogonally oriented, a requirement for polarization sensitivity. Screening pigment granules are abundant in the retinula cells and measure at least 1 μm in diameter...
March 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28295969/identification-and-characterization-of-the-luc2-type-luciferase-in-the-japanese-firefly-luciola-parvula-involved-in-a-dim-luminescence-in-immobile-stages
#5
Manabu Bessho-Uehara, Yuichi Oba
Nocturnal Japanese fireflies, Luciola parvula, emit from their lanterns a yellow light, one of the most red-shifted colors found among fireflies. Previously, we isolated and characterized two different types of luciferase gene, Luc1 and Luc2, from the fireflies Luciola cruciata and Luciola lateralis; Luc1 is responsible for the green-yellow luminescence of larval and adult lanterns, whereas Luc2 is responsible for the dim greenish glow of eggs and pupal bodies. The biological role of firefly lanterns in adults is related to sexual communication, but why the eggs and pupae glow remains uncertain...
March 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28276204/graphite-oxide-dispersed-cdte-quantum-dots-nanocomposite-for-flexible-display-luminescent-membranes
#6
Cui Liu, Lei Du, Yongjun Lin, Jiyuan Liang, Jun'an Liu, Yuan-Cheng Cao
A quantum dot (QD) dispersant material was prepared using graphite oxide (GO). Luminescent films were prepared using polyvinyl alcohol as the polymer matrix. First, water-soluble CdTe QDs were prepared by wet chemistry and GO was synthesized using a modified Hummers method. X-Ray diffraction tests showed that the GO reflection peak [001] was 11.9°, which indicates that the d-spacing is 0.7431 nm; atomic force microscopy showed a GO thickness of 200 nm. Fourier transform infrared spectra showed vibrations at 1624 cm(-1) for the carbonyl groups, and 3260 cm(-1) for the GO samples; the -C-O vibration was at 1320 cm(-1) and -COOH, -OH vibrations were at 950 cm(-1) ...
March 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28276194/a-highly-sensitive-detection-of-chloramphenicol-based-on-chemiluminescence-immunoassays-with-the-cheap-functionalized-fe3-o4-sio2-magnetic-nanoparticles
#7
Wang Linyu, Yao Manwen, Fang Chengzhi, Yao Xi
A strategy has been applied to chloramphenicol (CAP) detection with chemiluminescence immunoassays (CLIA) based on cheap functionalized Fe3 O4 @SiO2 magnetic nanoparticles (Fe-MNPs). The strategy that bovine serum albumin (BSA) was immobilized on cheap functionalized Fe-MNPs and that the CAP molecules were then immobilized on BSA, avoided the long process of dialysis for preparation of the BSA-CAP conjugates. The samples were detected for both methods that utilized two different kinds of functionalized Fe-MNPs (amine-functionalized Fe3 O4 @SiO2 and carboxylic acid-functionalized Fe3 O4 @SiO2 )...
March 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28233399/probing-the-mechanism-of-interaction-of-metoprolol-succinate-with-human-serum-albumin-by-spectroscopic-and-molecular-docking-analysis
#8
Suma K Pawar, Seetharamappa Jaldappagari
In the present work, the mechanism of the interaction between a β1 receptor blocker, metoprolol succinate (MS) and human serum albumin (HSA) under physiological conditions was investigated by spectroscopic techniques, namely fluorescence, Fourier transform infra-red spectroscopy (FT-IR), fluorescence lifetime decay and circular dichroism (CD) as well as molecular docking and cyclic voltammetric methods. The fluorescence and lifetime decay results indicated that MS quenched the intrinsic intensity of HSA through a static quenching mechanism...
February 24, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220689/copper-nanocluster-enhanced-luminol-chemiluminescence-for-high-selectivity-sensing-of-tryptophan-and-phenylalanine
#9
Yasaman-Sadat Borghei, Morteza Hosseini, Mehdi Khoobi, Mohammad Reza Ganjali
A remarkable method for the highly sensitive detection of phenylalanine and tryptophan based on a chemiluminescence (CL) assay was reported. It was found that fluorescent copper nanoclusters capped with cysteine (Cys-CuNCs) strongly enhance the weak CL signal resulting from the reaction between luminol and H2 O2 . Of the amino acids tested, phenylalanine and tryptophan could enhance the above CL system sensitively. Under optimum conditions, this method was satisfactorily described by a linear calibration curve over a range of 1...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220661/tunable-luminescence-and-energy-transfer-in-ca3-sio4-cl2-ce-3-li-mn-2-eu-2-phosphors
#10
Xiangqi Li, Xiuzhen Xie, Haiting Wei, Minzhen Zhong
A series of color-tunable Ca3-2x-y-z SiO4 Cl2 (CSC):xCe(3+) ,xLi(+) ,yMn(2+) ,zEu(2+) phosphors with low temperature phase structure was synthesized via the sol-gel method. An energy transfer process from Ce(3+) to Mn(2+) in CSC:0.01Ce(3+) ,0.01Li(+) ,yMn(2+) (y = 0.03-0.09) and the mechanism was verified to be an electric dipole-dipole interaction. The Ce(3+) and Mn(2+) emission intensities were greatly enhanced by co-doping Eu(2+) ions into CSC:0.01Ce(3+) ,0.01Li(+) ,0.07Mn(2+) phosphors due to competitive energy transfers from Eu(2+) /Ce(3+) to Mn(2+) , and Ce(3+) to Eu(2+) ...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220634/insights-into-the-discrepant-luminescence-for-basio3-eu-2-phosphors-prepared-by-solid-state-reaction-and-precipitation-reaction-methods
#11
Jiao Xu, Yang Zhao, Jingjing Chen, Zhiyong Mao, Yanfang Yang, Dajian Wang
Two synthesis routes, solid-state reaction and precipitation reaction, were employed to prepare BaSiO3 :Eu(2+) phosphors in this study. Discrepancies in the luminescence green emission at 505 nm for the solid-state reaction method sample and in the yellow emission at 570 nm for the sample prepared by the precipitation reaction method, were observed respectively. A detail investigation about the discrepant luminescence of BaSiO3 :Eu(2+) phosphors was performed by evaluation of X-ray diffraction (XRD), photoluminescence (PL)/photoluminescence excitation (PLE), decay time and thermal quenching properties...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220629/binding-of-hydroxylated-polybrominated-diphenyl-ethers-with-human-serum-albumin-spectroscopic-characterization-and-molecular-modeling
#12
Lulu Yang, Wu Yang, Zhiwei Wu, Zhongsheng Yi
Three hydroxylated polybrominated diphenyl ethers (OH-PBDEs), 3-OH-BDE-47, 5-OH-BDE-47, and 6-OH-BDE-47, were selected to investigate the interactions between OH-PBDEs with human serum albumin (HSA) under physiological conditions. The observed fluorescence quenching can be attributed to the formation of complexes between HSA and OH-PBDEs. The thermodynamic parameters at different temperatures indicate that the binding was caused by hydrophobic forces and hydrogen bonds. Molecular modeling and three-dimensional fluorescence spectrum showed conformational and microenvironmental changes in HSA...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220610/comparison-and-analysis-on-the-serum-binding-characteristics-of-aspirin-zinc-complex-and-aspirin
#13
Hua-Xin Zhang, Qun Zhang, Hong-Lin Wang, Li-Wei Li
This study was designed to compare the protein-binding characteristics of aspirin-zinc complex (AZN) with those of aspirin itself. AZN was synthesized and interacted with a model transport protein, human serum albumin (HSA). Three-dimensional fluorescence, ultraviolet-visible and circular dichroism (CD) spectra were used to characterize the interaction of AZN with HSA under physiological conditions. The interaction mechanism was explored using a fluorescence quenching method and thermodynamic calculation. The binding site and binding locality of AZN on HSA were demonstrated using a fluorescence probe technique and Förster non-radiation energy transfer theory...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220603/phosphor-for-phototherapy-review-on-psoriasis
#14
REVIEW
P S Hemne, R G Kunghatkar, S J Dhoble, S V Moharil, V Singh
We review developments in the field of phototherapy in terms of the treatment wavelength, dosimetry and phosphor used for different dermatoses. We attempt to categorize skin lesions and diseases by morphology, focusing on conditions that can be treated using phototherapy and photochemotherapy. Recent research and review articles are studied, the treatments explained and information on phototherapy that is applicable to psoriasis and other diseases is tabulated. The clinical features, epidemiology, epitalogy and various types of psoriasis, together with the therapies available to treat them are reported...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28185427/synthesis-of-aln-eu-2-green-phosphors-by-a-simple-direct-nitridation-method
#15
Qian Liu, Li Zhang, Junfeng Li, Kun Zhao
Eu-doped aluminum nitride phosphors were successfully prepared using simple direct nitridation of a metallic aluminum and Eu2 O3 powder mixture in flowing ammonia. AlN formed at reaction temperatures >900°C, and Eu(3+) transformed into the secondary oxide phase EuAl2 O4 in the nitridation condition. Phase pure AlN was obtained by post-heat treatment of the nitridated product at 1600°C for 3 h in a nitrogen atmosphere, with an Eu(2+) doping concentration < 0.5%. The phosphors exhibited broad green emission centered at 521 nm under 363 nm excitation...
February 10, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28185399/molecular-recognition-and-binding-of-beta-lactamase-ii-from-bacillus-cereus-with-penicillin-v-and-sulbactam-by-spectroscopic-analysis-in-combination-with-docking-simulation
#16
Yeli Zhang, Pan Qiao, Shuaihua Li, Xuan Feng, Liujiao Bian
The molecular recognition and binding interaction of beta-lactamase II from Bacillus cereus (Bc II) with penicillin V (PV) and sulbactam (Sul) at 277 K were studied by spectroscopic analysis and molecular docking. The results showed that a non-fluorescence static complex was separately formed between Bc II and two ligands, the molecular ratio of Bc II to PV or Sul was both 1:1 in the binding and the binding constants were 2.00 × 10(6) and 3.98 × 10(5) (L/mol), respectively. The negative free energy changes and apparent activation energies indicated that both the binding processes were spontaneous...
February 10, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28185413/sol-gel-synthesis-and-luminescence-property-of-sr4-al2-o7-re3-r-re%C3%A2-%C3%A2-eu-and-dy-r%C3%A2-%C3%A2-li-na-and-k-phosphors-for-white-leds
#17
Wentao Zhang, Meng Yu, Siyi Dai, Xianfei Chen, Jianping Long
Sr4 Al2 O7 :Eu(3+) and Sr4 Al2 O7 :Dy(3+) phosphors with alkali metal substitution were prepared using a sol-gel method. The effects of a charge compensator R on the structure and luminescence of Sr4 Al2 O7 :Re(3+) ,R(+) (Re = Eu and Dy; R = Li, Na and K) phosphors were investigated in detail. Upon heating to 1400°C, the structure of the prepared samples was that of the standard phase of Sr4 Al2 O7 . Under ultraviolet excitation, all Sr4 Al2 O7 :Eu(3+) ,R(+) samples exhibited several narrow emission peaks ranging from 550 to 700 nm due to the 4f → 4f transition of Eu(3+) ions...
February 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28181726/enhanced-photoluminescence-of-the-ca0-8-zn0-2-tio3-0-05-pr-3-phosphor-by-optimized-hydrothermal-conditions
#18
Mao Xia, Guanhua Wang, Zhiqiang Gu, Zhongxian Qiu, Chunying Rong, Jilin Zhang, Wenli Zhou, Liping Yu, Shixun Lian
The red-emitting phosphor Ca0.8 Zn0.2 TiO3 :Pr(3+) was synthesized using an ethylene glycol (EG)-assisted hydrothermal method. The effects of additional amounts of and order of adding EG, plus hydrothermal temperature, time, and pH on the composition, morphology and optical properties of the titanate phosphors were studied. The crystalline phases of the titanate phosphors were confirmed to be constituted of a series of co-existing CaTiO3 , Zn2 TiO4 and Ca2 Zn4 Ti16 O38 compounds in various proportions that were visualized using an X-ray diffractometer (XRD)...
February 9, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28139888/size-dependent-dual-emission-of-cu-mn-znse-qds-controlling-both-emission-wavelength-and-intensity
#19
Shuhong Xu, Han Jiang, Renjie Dong, Changgui Lv, Chunlei Wang, Yiping Cui
Cu,Mn:ZnSe quantum dots (QDs) of tunable size, controllable photoluminescence (PL) intensity ratio and PL range were prepared. A study of the experimental conditions confirmed that the size of Cu,Mn:ZnSe QDs is affected by the pH of the solution, the speed at which the Zn solution is injected and the reaction temperature. In general, high pH, low injection speed and high reaction temperature are optimal for preparing large QDs. Based on this knowledge, different sizes of Cu,Mn:ZnSe QDs were synthesized. Moreover, white emission Cu,Mn:ZnSe QDs were designed by controlling the experimental conditions and the feeding mole ratio of Mn:Cu...
January 31, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28139074/synthesis-and-photoluminescence-properties-of-red-emitting-phosphor-la2-x-eux-li0-5-al0-5-o4-x%C3%A2-%C3%A2-0-2-2-with-k2-nif4-structure
#20
S Kasturi, S Satish Kumar, V Sivakumar
Europium (Eu)(3+) -substituted La2 Li0.5 Al0.5 O4 red emitting phosphors were prepared by a conventional high-temperature solid-state reaction method. Powder X-ray diffraction, diffuse reflectance spectra and spectrofluorometry were used as vital characterizing tools for the phosphors. The Eu concentration dependence luminescence properties and Judd-Ofelt intensity parameters were investigated and calculated, respectively. All compositions showed an orange red emission (due to the magnetic and electric dipole transitions of the Eu(3+) ion) with the appropriate Commission Internationale de l'Eclairage (CIE) colour gamut under near ultraviolet or blue ray light excitation...
January 31, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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