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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/28430400/highly-sensitive-hplc-method-for-the-determination-of-galantamine-in-human-plasma-and-urine-through-derivatization-with-dansyl-chloride-using-fluorescence-detector
#1
Elif Özdemir, Sevgi Tatar Ulu
A new method based on fluorescence derivatization with 5-(dimethylamino) naphthalene-1-sulfonyl chloride (dansyl chloride) was developed for the quantitative determination of galantamine in human plasma and urine using high-performance liquid chromatography. The reaction between galantamine and dansyl chloride was optimally realized in 30 min at room temperature and pH 10.5, with a reagent to galantamine molar ratio of 2.13. The derivative was extracted with dichloromethane, and the extract was dried under a nitrogen stream and dissolved in the mobile phase...
April 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28429838/pyrophosphate-as-substrate-for-alkaline-phosphatase-activity-a-convenient-flow-injection-chemiluminescence-assay
#2
Qingfeng Zhang, Cuiyun Zhang, Meiding Yang, Donghong Yu, Cong Yu
A sensitive and convenient flow-injection chemiluminescence (FI-CL) turn-on assay for alkaline phosphatase (ALP) activity without any label and synthesis is developed. Cu(2+) can catalyze the luminol-H2 O2 CL reaction. Pyrophosphate (PPi) can chelate Cu(2+) and therefore the Cu(2+) -mediated luminol-H2 O2 CL reaction is inhibited. The addition of ALP can catalyze the hydrolysis of PPi into phosphate ions, Cu(2+) is released and the chemiluminescence recovers. A detection limit of 1 mU/mL ALP is obtained.
April 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28429837/fluorescence-based-sensor-for-selective-and-sensitive-detection-of-amoxicillin-amox-in-aqueous-medium-application-to-pharmaceutical-and-biomedical-analysis
#3
Samadhan P Pawar, Laxman S Walekar, Dattatray B Gunjal, Dattatray K Dalavi, Anil H Gore, Prashant V Anbhule, Shivajirao R Patil, Govind B Kolekar
We here for the first time demonstrate an analytical approach for the highly selective and sensitive detection of amoxicillin (Amox) in aqueous medium based on the fluorescence quenching of quantum dots (QDs). The change in fluorescence intensity of mercaptopropionic acid-capped cadmium sulphide (MPA-CdS) QDs is attributed to the increasing concentration of Amox. The results show that the fluorescence quenching of QDs by Amox takes place through both static and dynamic types of quenching mechanism. The fluorescence quenching of QDs with increase in concentration of Amox shows the linear range between 5 μg ml(-1) and 30 μg ml(-1) and the limit of detection (LOD) is 5...
April 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28429409/theoretical-insights-into-the-effect-of-ph-values-on-oxidation-processes-in-the-emission-of-firefly-luciferin-in-aqueous-solution
#4
Miyabi Hiyama, Hidefumi Akiyama, Nobuaki Koga
To elucidate the emission process of firefly d-luciferin oxidation across the pH range of 7-9, we identified the emission process by comparison of the potential and free-energy profiles for the formation of the firefly substrate and emitter, including intermediate molecules such as d-luciferyl adenylate, 4-membered dioxetanone, and their deprotonated chemical species. From these relative free energies, it is observed that the oxidation pathway changes from d-luciferin → deprotonated d-luciferyl adenylate → deprotonated 4-membered dioxetanone → oxyluciferin to deprotonated d-luciferin → deprotonated d-luciferyl adenylate → deprotonated 4-membered dioxetanone → oxyluciferin with increasing pH value...
April 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422449/enhanced-chemiluminescence-for-trazodone-trace-analysis-based-on-acidic-permanganate-oxidation-in-concurrent-presence-of-rhodamine-6g
#5
Keiichi Fujimori, Yuta Sakata, Takayo Moriuchi-Kawakami, Yasuhiko Shibutani
A new sensitized chemiluminescence method by acidic permanganate oxidation was developed for the sensitive determination of trazodone. A fluorescent dye as used rhodamine 6G to increase a chemiluminescence intensity. Under optimum conditions, the liner range of the calibration curve was obtained for 1-5000 nmol/L. The limit of detection was calculated from 3σ of a blank was 0.23 nmol/L. The coexistent ions and substances had no interference with the chemiluminescence measurement. The chemiluminescence spectra were measured to elucidate a possible mechanism for the system...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422435/blue-organic-light-emitting-diodes-based-on-fluorene-bridged-quinazoline-and-quinoxaline-derivatives
#6
Dong Young Kim, Jisu Kang, Song Eun Lee, Young Kwan Kim, Seung Soo Yoon
Two blue emitters based on fluorene-bridged quinazoline and quinoxaline derivatives were prepared via the Suzuki reaction. Their photoluminescent properties were investigated. Furthermore, theoretical studies on these materials using the density functional theory calculation were conducted. To explore their electroluminescent properties, multilayered organic light-emitting diodes were fabricated with the following device structure: indium-tin-oxide (180 nm)/4,4'-bis(N-(1-naphthyl)-N-phenylamino)biphenyl (50 nm)/blue emitting materials (1 and 2) (30 nm)/bathophenanthroline (35 nm)/8-hydroxy-quinolinato lithium (2 nm)/Al (100 nm)...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422411/optical-properties-of-eu-2-eu-3-mixed-valence-phosphor-ca2-sio2-f2-eu-2-eu-3
#7
Mubiao Xie, Guoxian Zhu, Rongkai Pan, Wei Xie
The Eu(2+) /Eu(3+) mixed valence phosphor Ca2 SiO2 F2 :Eu(2+) /Eu(3+) was prepared using a solid-state reaction synthesis method in a CO atmosphere, and the optical properties were investigated. The spectroscopic properties revealed that Ca(2+) ions were occupied by both Eu(2+) and Eu(3+) ions in Ca2 SiO2 F2 , and both ions were able to generate their characteristic emissions. A broad 5d → 4f Eu(2+) band at ~470 nm and narrow 4f → 4f Eu(3+) peaks upon excitation with n-UV light were observed. The ratio between Eu(2+) and Eu(3+) emissions changed regularly, and the relative intensity of the red component from Eu(3+) became systematically stronger with increasing overall Eu content...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422395/chiral-determination-of-cinchonine-using-an-electrochemiluminescent-sensor-with-molecularly-imprinted-membrane-on-the-surfaces-of-magnetic-particles
#8
Xingyi Yuan, Yanji Tan, Xiaoping Wei, Jianping Li
A novel molecular imprinting electrochemiluminescence sensor for detecting chiral cinchonine molecules was developed with a molecularly imprinted polymer membrane on the surfaces of magnetic microspheres. Fe3 O4 @Au nanoparticles modified with 6-mercapto-beta-cyclodextrin were used as a carrier, cinchonine as a template molecule, methacrylic acid as a functional monomer and N,N'-methylenebisacrylamide as a cross-linking agent. Cinchonine was specifically recognized by the 6-mercapto-beta-cyclodextrin functional molecularly imprinted polymer and detected based on enhancement of the electrochemiluminescence intensity caused by the reaction of tertiary amino structures of cinchonine molecules with Ru(bpy)3(2+) ...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28422382/quantum-dots-based-fluorescence-resonance-energy-transfer-biosensor-for-monitoring-cell-apoptosis
#9
Chunchuan Gu
The development of advanced methods for accurately monitoring cell apoptosis has extensive significance in the diagnostic and pharmaceutical fields. In this study, we developed a rapid, sensitive and selective approach for the detection of cell apoptosis by combining the site-specific recognition and cleavage of the DEVD-peptide with quantum dots (QDs)-based fluorescence resonance energy transfer (FRET). Firstly, biotin-peptide was conjugated on the surface of AuNPs to form AuNPs-pep through the formation of an Au-S bond...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28417589/glutathione-stabilized-cu-nanocluster-based-fluorescent-probe-for-sensitive-and-selective-detection-of-hg-2-in-water
#10
Tingting Luo, Shiting Zhang, Yujue Wang, Meina Wang, Mei Liao, Xingming Kou
In this paper, an innovative and facile one-pot method for synthesizing water-soluble and stable fluorescent Cu nanoclusters (CuNCs), in which glutathione (GSH) served as protecting ligand and ascorbic acid (AA) as reducing agent was reported. The resultant CuNCs emitted blue-green fluorescence at 440 nm, with a quantum yield (QD) of about 3.08%. In addition, the prepared CuNCs exhibited excellent properties such as good water solubility, photostability and high stability toward high ionic strength. On the basis of the selective quenching of Hg(2+) on CuNCs fluorescence, which may be the result of Hg(2+) ion-induced aggregation of the CuNCs, the CuNCs was used for the selective and sensitive determination of Hg(2+) in aqueous solution...
April 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378931/tunable-emission-from-libabo3-eu-3-bi-3-phosphor-for-solid-state-lighting
#11
Mantwa Annah Lephoto, Kamohelo George Tshabalala, Selepe Joel Motloung, Samy Khalil Kamel Shaat, Odireleng Martin Ntwaeaborwa
Europium (Eu(3+) ) and bismuth (Bi(3+) ) co-activated LiBaBO3 powder phosphors were synthesized by a solid-state reaction and the structure, particle morphology, optical and photoluminescent properties were investigated. X-Ray diffraction patterns of the LiBaBO3 phosphors crystallized in a pure monoclinic phase, i.e. there were no secondary phases due to either incidental impurities or undecomposed starting materials. Scanning electron microscopy images showed that the powders were made up of fluffy needle-like particles that were randomly aligned...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378916/cdse-and-cdse-cds-core-shell-qds-new-approach-for-synthesis-investigating-optical-properties-and-application-in-pollutant-degradation
#12
S Abbasi, M Molaei, M Karimipour
In this work, CdSe quantum dots (QDs) were synthesized by a simple and rapid microwave activated approach using CdSO4 , Na2 SeO3 as precursors and thioglycolic acid (TGA) as capping agent molecule. A novel photochemical approach was introduced for the growth of CdS QDs and this approach was used to grow a CdS shell around CdSe cores for the formation of a CdSe/CdS core-shell structure. The core-shells were structurally verified using X-ray diffraction, transmission electron microscopy and FTIR (Fourier-transform infrared (FTIR)) spectroscopy...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378893/characterization-of-a-novel-allergenic-protein-from-the-octocoral-scleronephthya-gracillima-kuekenthal-that-corresponds-to-a-new-gfp-like-family-named-akane
#13
Yuko Kato, Mitsuru Jimbo, Youichi Sakakibara, Reiko Onizuka, Tatsuya Takahashi, Sachiko Matsuhashi, Hajime Mita, Kei Amada, Yukimitsu Imahara, Kimiko Tanabe, Akihisa Toda, Hisao Kamiya
Certain marine organisms have been known to cause allergic reactions among occupational fishermen. We have previously reported that bronchial asthma among the workers engaged in spiny lobster fishing in Japan was caused by octocorals such as Dendronephthya sp. and Scleronephthya gracillima (previously named Alcyonium gracillimum). Now we have found another octocoral, Scleronephthya gracillima (Kuekenthal), which causes the allergic disease in fishermen. The octocoral was characterized as a new green fluorescent protein (GFP)-like family...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378538/micelle-enhanced-direct-spectrofluorimetric-method-for-the-determination-of-linifanib-application-to-stability-studies
#14
Afnan H Zawaneh, Nehal N Khalil, Sundus A Ibrahim, Wafaa N Al-Dafiri, Hadir M Maher
A new simple stability-indicating spectrofluorimetric method has been developed and validated for the determination of the tyrosine kinase inhibitor, linifanib (LNF). The proposed method makes use of the native fluorescence characteristics of LNF in a micellar system. Compared with aqueous solutions, the fluorescence intensity of LNF was greatly enhanced upon the addition of Tween-80. The relative fluorescence intensity of LNF was measured in a diluting solvent composed of 2% Tween-80: phosphate buffer pH 8...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378411/luminescence-properties-of-ce-3-in-orthosilicate-oxyapatite-nay9-sio4-6-o2
#15
Mubiao Xie, Wei Xie, Guoxian Zhu, Rongkai Pan
Ce(3+) -doped orthosilicate oxyapatite NaY9 (SiO4 )6 O2 phosphors NaY9-x (SiO4 )6 O2 :xCe(3+) were prepared by a conventional high-temperature solid-state reaction method, and their spectroscopic characteristics were systematically investigated. The occupancies of Ce(3+) ions at two different sites (Wyckoff 6 h and 4f sites) in NaY9 (SiO4 )6 O2 were determined. The influence of doping concentration on the emission intensity of Ce(3+) was investigated and the critical distance Rc was estimated in terms of the concentration quenching data...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28378400/interaction-between-azo-dye-acid-red-14-and-pepsin-by-multispectral-methods-and-docking-studies
#16
Ludan Zhao, Ronghui Guo, Qiaomei Sun, Jianwu Lan, Hui Li
The interaction of synthetic azo dye Acid Red 14 with pepsin was studied by fluorescence spectroscopy, UV-vis spectroscopy, circular dichroism and molecular docking. Results from the fluorescence spectroscopy show that Acid Red 14 has a strong capability to quench the intrinsic fluorescence of pepsin with static quenching. Binding constant, number of the binding sites and thermodynamic parameters were measured at different temperatures. The result indicates that Acid Red 14 interact with pepsin spontaneously by hydrogen bonding and van der Waals interactions...
April 5, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28374530/binding-of-fluphenazine-with-human-serum-albumin-in-the-presence-of-rutin-and-quercetin-an-evaluation-of-food-drug-interaction-by-spectroscopic-techniques
#17
Jiao-Jiao Jing, Bin Liu, Xin Wang, Xin Wang, Ling-Ling He, Xue-Yuan Guo, Ming-Ling Xu, Qian-Yu Li, Bo Gao, Bo-Yang Dong
The interactions between human serum albumin (HSA) and fluphenazine (FPZ) in the presence or absence of rutin or quercetin were studied by fluorescence, absorption and circular dichroism (CD) spectroscopy and molecular modeling. The results showed that the fluorescence quenching mechanism was static quenching by the formation of an HSA-FPZ complex. Entropy change (ΔS(0) ) and enthalpy change (ΔH(0) ) values were 68.42 J/(mol⋅K) and -4.637 kJ/mol, respectively, which indicated that hydrophobic interactions and hydrogen bonds played major roles in the acting forces...
April 4, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28371213/one-step-synthesis-of-nitrogen-boron-co-doped-fluorescent-carbon-nanoparticles-for-glucose-detection
#18
Meijuan Liang, Yi Ren, Haijuan Zhang, Yunxia Ma, Xiaoying Niu, Xingguo Chen
Heteroatom-doped carbon nanoparticles (CNPs) have attracted considerable attention due to an effective improvement in their intrinsic properties. Here, a facile and simple synthesis of nitrogen, boron co-doped carbon nanoparticles (NB-CNPs) from a sole precursor, 3-aminophenylboronic acid, was performed via a one-step solid-phase approach. Because of the presence of boronic acid, NB-CNPs can be used directly as a fluorescent probe for glucose. Based on a boronic acid-triggered specific reaction, we developed a simple NB-CNP probe without surface modification for the detection of glucose...
March 30, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28371383/determination-of-fluvoxamine-maleate-in-human-urine-and-human-serum-using-alkaline-kmno4-rhodamine-b-chemiluminescence
#19
Dongqin Yang, Yanyan He, Funan Chen
The flow-injection chemiluminescence (FI-CL) behavior of a gold nanocluster (Au NC)-enhanced rhodamine B-KMnO4 system was studied under alkaline conditions for the first time. In the present study, the as-prepared bovine serum albumin-stabilized Au NCs showed excellent stability and reproducibility. The addition of trace levels of fluvoxamine maleate (Flu) led to an obvious decline in CL intensity in the rhodamine B-KMnO4 -Au NCs system, which could be used for quantitative detection of Flu. Under optimized conditions, the proposed CL system exhibited a favorable analytical performance for Flu determination in the range 2 to 100 μg ml(-1) ...
March 29, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28371207/spectroscopic-investigation-and-in-vitro-cytotoxic-activity-toward-hepg2-cells-of-a-copper-compound-complexed-with-human-serum-albumin
#20
Mei Li, ShuJuan Huang, Qingyou Cai, YongRong Xie
The human serum albumin (HSA) interaction of a mixed-ligand copper compound (1) with an imidazole and taurine Schiff base derived from salicylaldehyde and taurine was investigated using fluorescence spectroscopy, UV-vis spectroscopy, time-resolved fluorescence spectroscopy, circular dichroism (CD) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and a molecular docking technique. The results of fluorescence and time-resolved fluorescence spectroscopy indicated that 1 can effectively quench the HSA fluorescence by a static mechanism...
March 29, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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