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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/28544697/a-naphthalene-derivative-as-turn-on-fluorescent-chemosensor-for-the-highly-selective-and-sensitive-detection-of-al-3
#1
Zhong-Xin Zhu, Dong-Dong Yu, Zhi-Guo Liu, Ye-Wei Huang, A-Yi Zhou, Zhi-Wei Chen, Jia Sun, Xu Wang, Li-Tai Jin, Wei-Tao Cong
A Schiff base compound derived from naphthalene has been synthesized and characterized as an Al(3+) -selective fluorescent probe. The chemosensor (L) exhibits high selectively for Al(3+) in aqueous solution, even in the presence of biologically relevant cations such as Na(+) , K(+) , Ca(2+) , Mg(2+) , Pb(2+) and several transition metal ions. There was no observed interference from anions like Br(-) , Cl(-) , HSO3(-) , SO3(2-) , S2 O3(2-) , NO2(-) , CO3(2-) and AC(-) . The lowest detection limit for the chemosensor L was found to be 1...
May 22, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28524362/a-novel-chemiluminescence-sensor-for-the-determination-of-indomethacin-based-on-sulfur-and-nitrogen-co-doped-carbon-quantum-dot-kmno4-reaction
#2
Tooba Hallaj, Mohammad Amjadi, Jamshid L Manzoori, Neda Azizi
We report on a simple and sensitive sulfur and nitrogen co-doped carbon quantum dot (S,N-CQD)-based chemiluminescence (CL) sensor for the determination of indomethacin. S,N-CQDs were prepared by a hydrothermal method and characterized by fluorescence spectra, Fourier transform infrared spectroscopy and transmission electron microscopy. To obtain the best CL system for determination of indomethacin, the reaction of S,N-CQDs with some common oxidants was studied. Among the tested systems, the S,N-CQD-KMnO4 reaction showed the highest sensitivity for the detection of indomethacin...
May 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28524270/interaction-studies-of-copper-complex-containing-food-additive-carmoisine-dye-with-human-serum-albumin-hsa-spectroscopic-investigations
#3
Nahid Shahabadi, Alireza Akbari, Mina Jamshidbeigi, Soraya Moradi Fili
In this study, the interaction between human serum albumin (HSA) and a copper complex of carmoisine dye; [Cu(carmoisine)2 (H2 O)2 ], was studied in vitro using multi-spectroscopic methods. It was found that the intrinsic fluorescence of HSA was quenched by the addition of the [Cu(carmoisine)2 (H2 O)2 ] complex and the quenching mechanism was considered as static quenching by formation of a [Cu(carmoisine)2 (H2 O)2 ]-HSA complex. The binding constant was about 10(4)  M(-1) at room temperature. The values of the calculated thermodynamic parameters (ΔH < 0 and ΔS > 0) suggested that both hydrogen bonds and the hydrophobic interactions were involved in the binding process...
May 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28524265/a-highly-sensitive-resonance-rayleigh-scattering-and-colorimetric-assay-for-the-recognition-of-propranolol-in-%C3%AE-adrenergic-blocker
#4
Xuanping Tan, Jidong Yang, Qiong Yang, Qin Li
In this work, a highly sensitive, citrate anion-capped gold nanoparticles (AuNPs)-based assay for the determination of propranolol in real samples with resonance Rayleigh scattering (RRS) and colorimetry was developed. When AuNPs were prepared by the sodium citrate reduction method, citrate anions self-assembled on the surface of AuNPs to form supramolecular complex anions. In BR 4.6 buffer solution, propranolol was positively charged and could bind with AuNPs to form larger aggregates through electrostatic force and hydrophobic effects...
May 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28516499/spectrofluorometric-determination-of-clonazepam-in-dosage-forms-application-to-content-uniformity-testing-and-human-plasma
#5
Fathalla Belal, Fawzia Ibrahim, Zainab Sheribah, Heba Alaa
The present paper describes a developed and validated simple, highly sensitive and cost-effective spectrofluorometric method for determination of clonazepam (CNP). The proposed method depends on forming a highly fluorescent product through the reduction of CNP with Zn/HCl. The produced fluorophore exhibits a strong fluorescence at λem 350 nm after excitation at λex 250 nm. The use of carboxymethylcellulose (CMC) greatly enhanced the fluorescence intensity of the produced fluorophore to the extent of about 100%...
May 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28516473/a-ratiometric-fluorescent-chemosensor-for-the-detection-of-cysteine-in-aqueous-solution-at-neutral-ph
#6
Yuanyuan Li
A ratiometric fluorescent chemosensor 2-(2'-hydroxy-3'-formyl-5'-methoxyphenyl)benzothiazole (1) was developed for the detection of cysteine (Cys). In aqueous solution at neutral pH, 1 exhibited a ratiometric fluorescent response to Cys with a remarkable red-to-green shift in the emission wavelength. This fluorescence change was attributed to the cyclization reaction between the formyl group in 1 and the amino and sulfhydryl group in Cys in a stoichiometry of 1: 1 according to the proposed mechanism. At neutral pH, 1 displayed a significant fluorescence ratio signal enhancement with the addition of Cys...
May 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28516450/synthesis-and-multi-spectroscopic-study-on-dna-binding-cleavage-and-biological-properties-of-m-ii-complexes-based-on-n2-o2-donor-schiff-base-ligand
#7
V Violet Dhayabaran, T Daniel Prakash
A novel Schiff base, (S,Z)-4-(methylthio)-2-((3-oxo-2,3-dihydro-1H-inden-1-ylidene)amino)butanoic acid (L) and four M(II) complexes (where M = Co, Cu, Ni and Zn) were synthesized and characterized. The DNA-binding characteristics of the complexes were investigated using various spectroscopic methods and viscosity measurements. Analysis of the results suggests that all the complexes bind to calf thymus DNA via intercalation. Among the four, Cu(II) complex was found to promote the photocleavage of plasmid DNA pBR322 under irradiation at 365 nm...
May 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28512780/novel-enantioselective-fluorescent-sensors-for-tartrate-anion-based-on-acridinezswsxa
#8
Chaoyu Wang, Peng Wang, Xiaoyan Liu, Jiaxin Fu, Kun Xue, Kuoxi Xu
Novel chiral fluorescence sensors L-1 and D-1 incorporating N-Boc-protected alanine and acridine moieties were synthesized. The recognition ability of the sensors was studied by fluorescence titration, (1) H NMR spectroscopy and density functional theory (DFT) calculations. The sensors exhibited good enantioselective fluorescent sensing ability toward enantiomers of tartrate anion for the selected carboxylate anions and formed 1: 1 complexes by multiple hydrogen bonding interactions.
May 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28513094/chemiluminescence-detection-of-trace-iodide-with-flow-injection-analysis-of-kmno4-carbon-dots-system
#9
Suqin Han, Bibi Liu, Zheyan Fan, Lifu Zhang, Fengying Jiang
Ultra-weak chemiluminescence (CL) from the reaction of iodide and KMnO4 was strongly enhanced by carbon nanodots (CNDs) in an acidic medium. The CL intensity was directly proportional to the concentration of iodide in the solution. Therefore, a flow-injection CL system with high sensitivity, selectivity and reproducibility is proposed for the determination of iodide. The proposed method exhibited advantages over a linear range of 3.0 × 10(-6) -1.0 × 10(-4)  mol/L and had a detection limit of 3.5 × 10(-7)  mol/L...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28513086/photoluminescent-properties-of-novel-design-heteroleptic-zn-ii-complexes
#10
Atul C Vamja, Kiran R Surati
Three novel heteroleptic Zn(II) complexes containing 8-hydroxy quinoline and various pyrazolone-based derivatives were synthesized and their structures confirmed by (1) H-nuclear magnetic resonance, mass spectrometry, Fourier transform infra-red spectroscopy, UV-vis analysis and element analysis. All three complexes showed good photoluminescence properties in the solid state and in solution in the maximum emission range from 475 to 490 nm with a quantum yield of 0.45 to 0.51. Absorption spectra revealed that the complexes possessed a maximum absorption range of 272-281 nm with a band gap of 2...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28513077/tuneable-luminescence-properties-of-edta-assisted-zns-mn-nanocrystals-from-a-yellow-orange-to-a-red-emission-band
#11
R Viswanath, H S Bhojya Naik, G Arun Kumar, I K Suresh Gowda, S Yallappa
Luminescence technology has been improved with the help of semiconductor nanoparticles that possess novel optical and electrical properties compared with their bulk counterpart. The aim of this study was to design semiconductor nanocrystals in their pure (ZnS) or doped form (ZnS:Mn) with different concentrations of Mn(2+) ions by a wet chemical route stabilized by ethylenediamine tetra-acetic acid (EDTA) and to evaluate their luminescence properties. The nanocrystals were characterized by physicochemical techniques such as X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SEAD), EDS, and ultraviolet (UV)-visible light and photoluminescence (PL) studies...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28513070/influence-of-quercetin-on-the-interaction-of-gliclazide-with-human-serum-albumin-spectroscopic-and-docking-approaches
#12
Miroslava Kameníková, Paul Georg Furtmüller, Mária Klacsová, Arturo Lopez-Guzman, José Luis Toca-Herrera, Anika Vitkovská, Ferdinand Devínsky, Pavel Mučaji, Milan Nagy
Protein-binding interactions are displacement reactions which have been implicated as the causative mechanisms in many drug-drug interactions. Thus, the aim of presented study was to analyse human serum albumin-binding displacement interaction between two ligands, hypoglycaemic drug gliclazide and widely distributed plant flavonoid quercetin. Fluorescence analysis was used in order to investigate the effect of substances on intrinsic fluorescence of human serum albumin (HSA) and to define binding and quenching properties of ligand-albumin complexes in binary and ternary systems, respectively...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28512990/luminescence-circular-dichroism-and-in-silico-studies-of-binding-interaction-of-synthesized-naphthylchalcone-derivatives-with-bovine-serum-albumin
#13
Sharda Pasricha, Deepti Sharma, Himanshu Ojha, Pragya Gahlot, Mallika Pathak, Mitra Basu, Raman Chawla, Sugandha Singhal, Anju Singh, Rajeev Goel, Shrikant Kukreti, Shefali Shukla
Chalcones possess various biological properties, for example, antimicrobial, anti-inflammatory, analgesic, antimalarial, anticancer, antiprotozoal and antitubercular activity. In this study, naphthylchalcone derivatives were synthesized and characterized using (1) H NMR (13) C NMR, Fourier transform infrared and mass techniques. Yields for all derivatives were found to be >90%. Protein-drug interactions influence the absorption, distribution, metabolism and excretion (ADME) properties of a drug. Therefore, to establish whether the synthesized naphthylchalcone derivatives can be used as drugs, their binding interaction toward a serum protein (bovine serum albumin) was investigated using fluorescence, circular dichroism and molecular docking techniques under physiological conditions...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28512849/synthesis-and-luminescence-properties-of-brick-shaped-lanthanum-organic-frameworks-with-mesoporous-and-macroporous-architectures
#14
Wanping Chen, Jun Yang, Yue Zhao, Yangjie Hu, Bolin Xiang
Generally, metal-organic frameworks (MOFs) are made up from kinds of repeating microporous structure. Here, a series of Eu(3+) ions activated terephthalate-based lanthanum-organic frameworks (La-MOFs) was synthesized by a hydrothermal reaction. By controlling the reaction time, we obtained some unique brick-shaped La-MOFs in a micron scale size range, and these La-MOFs showed tunable mesoporous and macroporous architectures. It is speculated that the change in the composition and structure of building units results in the formation of this mesoporous and macroporous heterogeneous architectures...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28512775/a-porphyrin-based-fluorescence-method-for-zinc-determination-in-commercial-propolis-extracts-without-sample-pretreatment
#15
Gastón Darío Pierini, Victor Hugo A Pinto, Clarissa G C Maia, Wallace D Fragoso, Julio S Reboucas, María Eugenia Centurión, Marcelo Fabián Pistonesi, María Susana Di Nezio
The quantification of zinc in over-the-counter drugs as commercial propolis extracts by molecular fluorescence technique using meso-tetrakis(4-carboxyphenyl)porphyrin (H2 TCPP(4) ) was developed for the first time. The calibration curve is linear from 6.60 to 100 nmol L(-1) of Zn(2+) . The detection and quantification limits were 6.22 nmol L(-1) and 19.0 nmol L(-1) , respectively. The reproducibility and repeatability calculated as the percentage variation of slopes of seven calibration curves were 6.75% and 4...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28503901/thermoluminescence-properties-of-eu-doped-and-eu-dy-codoped-sr2-al2-sio7-phosphors
#16
Akhilesh Jadhaw, Vivek D Sonwane, Anubha S Gour, Piyush Jha
We report the thermoluminescence properties of Sr1.96 Al2 SiO7 :Eu0.04 and Sr1.92 Al2 SiO7 :Eu0.04 Dy0.04 phosphors. These phosphors were prepared by a high-temperature solid-state reaction method. The prepared phosphors were characterized by X-ray diffraction. A 254 nm source was used for ultraviolet (UV) irradiation and a (60) Co source was used for γ-irradiation. The effect of heating rate and UV-exposure were examined. The thermoluminescence temperature shifts to higher values with increasing heating rate and thermoluminescence intensity increases with increasing UV exposure time...
May 14, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28497907/effect-of-tio2-nanoparticles-on-some-photophysical-characteristics-of-ketocyanine-dyes
#17
Javuku Thipperudrappa, U P Raghavendra, Mahantesha Basanagouda
The effect of titanium dioxide (TiO2 ) nanoparticles (NPs) on photophysical characteristics of 2,5-di[(E)-1-(4-dimethylaminophenyl) methylidine]-1-cyclopentanone (2,5-DMAPMC) and 2,5-di[(E)-1-(4-diethylaminophenyl)methylidine]-1-cyclopentanone (2,5-DEAPMC) ketocyanine dyes has been studied using absorption, steady-state and time-resolved fluorescence spectroscopy. The magnitudes of association constants determined based on modified absorption spectrum of dyes due to the presence of TiO2 NPs indicate the interaction of TiO2 NPs with dye molecules...
May 12, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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
#18
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
#19
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
#20
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
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