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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/30014561/a-simple-gold-nanoplasmonic-sers-method-for-trace-hg-2-based-on-aptamer-regulating-graphene-oxide-catalysis
#1
Chongning Li, Xiaoliang Wang, Aihui Liang, Yanghe Luo, Guiqing Wen, Zhiliang Jiang
The as-prepared graphene oxide (GO) exhibited a strong catalytic effect on reduction of HAuCl4 by trisodium citrate to form gold nanoplasmons (AuNPs) with a strong surface-enhanced Raman scattering (SERS) effect at 1615 cm-1 in the presence of molecular probe Victoria blue 4R (VB4r). SERS intensity increased with nanocatalyst GO concentration due to the formation of more AuNP substrates. The aptamer (Apt) of Hg2+ can bind to GO to form Apt-GO complexes, which can strongly inhibit nanocatalysis. When target Hg2+ is present, the formed stable Hg2+ -Apt complexes are separated from the GO surface, which leads to GO catalysis recovery...
July 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30004173/construction-of-a-novel-turn-on-off-fluorescence-sensor-used-for-highly-selective-detection-of-thiamine-via-its-quenching-effect-on-o-phen-zn-2-complex
#2
Hui Zhang, Hongyun Chen, Hongxi Li, Shuang Pan, Yalin Ran, Xiaoli Hu
In this work, a simple and selective fluorescence sensor approach called 'turn-on-off' for the determination of thiamine (TM) has been developed. As known, the o-phenanthroline (o-phen) has inner fluorescence, though when reacted with zinc ions to form the o-phen-Zn2+ complex the fluorescence intensity was enhanced effectively, while upon addition of TM into the o-phen-Zn2+ complex solution, the intensity of the system was gently quenched, which was termed the 'turn-on-off' probe. Notably, the method possessed highly selective, sensitive determination for TM with a detection limit of 0...
July 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29984561/a-highly-selective-colorimetric-and-long-wavelength-fluorescent-probe-for-the-detection-of-hg-2
#3
Jing Xu, Zuokai Wang, Caiyun Liu, Zhenghe Xu, Ning Wang, Xin Cong, Baocun Zhu
Currently, the fluorescent probe is an important method for detecting heavy metal ions, especially mercury ion (Hg2+ ), which is harmful to the health of humans and the environment due to its toxicity and extensive use. In this paper, we designed and synthesized a colorimetric and long-wavelength fluorescent probe Hg-P with high sensitivity and excellent selectivity, which could detect Hg2+ by the changes of visual color, fluorescence and absorption spectroscopy. With the addition of Hg2+ to probe Hg-P solution, its color changed from yellow to pink, and showed a 171 nm red-shifted absorption spectrum...
July 8, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29984521/structures-and-luminescent-sensors-of-mixed-counterions-based-salen-type-lanthanide-coordination-polymers
#4
Jin-Long Du, Xin-Yu Wang, Xiao-Yan Zou, Yu-Xin Li, Wei-Zuo Li, Xu Yao, Guang-Ming Li
Reactions of N,N'-bis (salicylidene)-1,2-cyclohexanediamine (H2 L) with mixed lanthanide counterions of LnCl3 ·6H2 O and Ln (NO3 )3 ·6H2 O afford six H2 L lanthanide coordination polymers, e.g. {[Pr(H2 L)2 (NO3 )2 Cl]·2CH2 Cl2 }n (1); {[Ln(H2 L)1.5 (NO3 )3 ]2 ·5CHCl3 ·mCH3 OH}n [Ln = Sm (2), Eu (3), Gd (4), Tb (5) and Yb (6); m = 1 (2-5); m = 0 (6)]. X-ray crystallographic analysis reveals that complex 1 exhibits three-dimensional diamondoid topologic structure and complexes 2-6 are of two-dimensional structure...
July 8, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29984449/stability-indicating-spectrofluorimetric-method-for-the-assay-of-riboflavin-and-photoproducts-kinetic-applications
#5
Iqbal Ahmad, Zubair Anwar, Muhammad Ali Sheraz, Sofia Ahmed, Saif-Ur-Rehman Khattak
A stability-indicating spectrofluorimetric method has been developed for the simultaneous assay of riboflavin (RF) and photoproducts, formylmethylflavin (FMF), lumichrome (LC) and lumiflavin (LF) in aqueous solution. The method is based on the extraction of LC formed in acid solution and LC and LF formed in alkaline solution with chloroform at pH 2.0 and their assay by fluorescence measurements at 478 and 530 nm, respectively. The aqueous phase, on readjustment of the pH to 6.5, is used to extract FMF with chloroform and its assay is carried out at 530 nm...
July 8, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29968975/utility-of-ninhydrin-reagent-for-spectrofluorimetric-determination-of-heptaminol-in-human-plasma
#6
Mahmoud A Omar, Dalia M Nagy, Monica E Halim
For the determination of heptaminol (HEP) in its authentic and dosage form as well as in human plasma, a new simple, sensitive and cheap fluorimetric method of analysis was developed and validated. The presented method is based on the reaction between aliphatic primary amino moiety present in HEP with ninhydrin and phenylacetaldehyde using Torell and Stenhagen buffer at pH 8.2 that yields a highly fluorescent derivative which after excitation at 390 nm showed a fluorescence emission at 464 nm. The effects of various experimental factors on both the development and stability of the fluorescent product was evaluated and optimized...
July 3, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29968966/enhanced-photoluminescence-properties-of-electrospun-dy-3-doped-zno-nanofibres-for-white-lighting-devices
#7
Chaitali Niranjan Pangul, Shyamkant Wasudeorao Anwane, Subhash Baburao Kondawar
Dy3+ -doped ZnO nanofibres with diameters from 200 to 500 nm were made using an electrospinning technique. The as-fabricated amorphous nanofibres resulted in good crystalline continuous nanofibres through calcination. Dy3+ -doped ZnO nanofibres were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) light spectroscopy, Fourier transform infrared spectroscopy (FTIR), and photoluminescence (PL). XRD showed the well defined peaks of ZnO...
July 3, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29968960/design-of-a-phosphinate-based-bioluminescent-probe-for-superoxide-radical-anion-imaging-in-living-cells
#8
Xinda Liu, Xiaodong Tian, Xu Xu, Jianzhong Lu
Superoxide radical anion (O2 ˙- ) as an important member of reactive oxygen species (ROS) plays a vital role both in physiology and pathology. Herein we designed and synthesized a novel phosphinate-based bioluminescence probe for O2 ˙- detection in living cells, which exhibited good sensitivity for capturing O2 ˙- at the nanomole level and high selectivity against other ROS. The probe was further found to be of low toxicity for living cells and was then successfully employed for sensing endogenous O2 ˙- by using phorbol-12-myristate-13-acetate (PMA) as a traditional O2 ˙- stimulator in Huh7 cells...
July 3, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29943410/silver-doped-graphite-carbon-nitride-nanosheets-as-fluorescent-probe-for-the-detection-of-curcumin
#9
Haifen Yang, Xuebing Li, Xinxv Wang, Wenfang Chen, Wei Bian, Martin M F Choi
Green fluorescent silver (Ag)-doped graphite carbon nitride (Ag-g-C3 N4 ) nanosheets have been fabricated by an ultrasonic exfoliating method. The fluorescence of the Ag-g-C3 N4 nanosheets is quenched by curcumin. The fluorescence intensity decreases with the increase in the concentration of curcumin, indicating that the Ag-g-C3 N4 nanosheets can function as a non-toxic and facile fluorescence probe to detect curcumin. The fluorescence intensity of Ag-g-C3 N4 nanosheets shows a linear relationship to curcumin in the concentration range 0...
June 26, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29927540/a-new-xanthene-based-two-photon-fluorescent-probe-for-the-imaging-of-1-4-dithiothreitol-dtt-in-living-cells
#10
Chao Wang, Baoli Dong, Xiuqi Kong, Nan Zhang, Wenhui Song, Weiying Lin
1,4-Dithiothreitol (DTT) has wide applications in cell biology and biochemistry. Development of effective methods for monitoring DTT in biological systems is important for the safe handling and study of toxicity to humans. Herein, we describe a two-photon fluorescence probe (Rh-DTT) to detect DTT in living systems for the first time. Rh-DTT showed high selectivity and sensitivity to DTT. Rh-DTT can be successfully used for the two-photon imaging of DTT in living cells, and also can detect DTT in living tissues and mice...
June 21, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29927539/benzofurazan-based-fluorophore-for-the-selective-determination-of-flupentixol-dihydrochloride-application-to-content-uniformity-testing
#11
Islam M Mostafa, Sayed M Derayea, Dalia M Nagy, Mahmoud A Omar
One of the most commonly used drugs in treatment of schizophrenia is flupentixol dihydrochloride, therefore it is important to develop a simple, low cost and sensitive spectrofluorimetric method for the estimation of flupentixol dihydrochloride. The yellow fluorescent product that is generated from the nucleophilic substitution reaction of the free lone pair of the alcoholic hydroxyl group of the drug and 4-chloro-7-nitrobenzofurazan (NBD-Cl) in Mcllvaine buffer pH 7.0 was estimated at 510 nm (λex 460 nm)...
June 21, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29927538/insights-into-the-binding-interaction-between-copper-ferrite-nanoparticles-and-bovine-serum-albumin-an-effect-on-protein-conformation-and-activity
#12
Sabera Millan, Aniket Kumar, Lakkoji Satish, B Susrisweta, Priyabrat Dash, Harekrushna Sahoo
The binding affinity between bovine serum albumin (BSA) and copper ferrite (CuFe2 O4 ) nanoparticles in terms of conformation, stability and activity of protein was studied using various spectroscopic methods. The quenching involved in BSA-CuFe2 O4 NP interaction was static quenching as analysed by different techniques (steady-state and time-resolved fluorescence along with temperature-dependent fluorescence measurements). Among all types of possible interactions, it was revealed that the major binding forces were van der Waals interaction and hydrogen bonding, which were explored from negative values of enthalpy change (∆H = -193...
June 21, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29927536/microwave-assisted-sintering-synthesis-of-greenish-yellow-emitting-sr-2-sio-4-eu-2-phosphors
#13
Woo Cheol Lee, Jin Young Park, Hyun Kyoung Yang, Minseok Kwak, Byung Kee Moon, Ki-Wan Jang
Europium ion (Eu2+ ) doped Sr2 SiO4 phosphors with greenish-yellow emission were synthesized using microwave-assisted sintering. The phase structure and photoluminescence (PL) properties of the obtained phosphor samples were investigated. The PL excitation spectra of the Sr2 SiO4 :Eu2+ phosphors exhibited a broad band in the range of 260 nm to 485 nm with a maximum at 361 nm attributed to the 5f-4d allowed transition of the Eu2+ ions. Under an excitation at 361 nm, the Sr2 SiO4 :Eu2+ phosphor exhibited a greenish-yellow emission peak at 541 nm with an International-Commission-on-Illumination (CIE) chromaticity of (0...
June 21, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29927531/disposable-luciferase-based-microfluidic-chip-for-rapid-assay-of-water-pollution
#14
Ivan Denisov, Kirill Lukyanenko, Anton Yakimov, Igor Kukhtevich, Elena Esimbekova, Peter Belobrov
In the present study, we demonstrate the use of a disposable luciferase-based microfluidic bioassay chip for environmental monitoring and methods for fabrication. The designed microfluidic system includes a chamber with immobilized enzymes of bioluminescent bacteria Photobacterium leiognathi and Vibrio fischeri and their substrates, which dissolve after the introduction of the water sample and thus activate bioluminescent reactions. Limits of detection for copper (II) sulfate, 1,3-dihydroxybenzene and 1,4-benzoquinone for the proposed microfluidic biosensor measured 3 μM, 15 mM, and 2 μM respectively, and these values are higher or close to the level of conventional environmental biosensors based on lyophilized bacteria...
June 21, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29920943/bimolecular-fluorescence-quenching-reactions-of-the-biologically-active-coumarin-composite-2-acetyl-3h-benzo-f-chromen-3-one-in-different-solvents
#15
V V Koppal, R M Melavanki, R A Kusanur, N R Patil
A study on fluorescence quenching was carried out for the coumarin derivative 2-acetyl-3H-benzo[f]chromen-3-one (2AHBC) with aniline at room temperature. Efficient fluorescence quenching was observed and Stern-Volmer (S-V) plots showed upward curves from linearity in all solvents of different polarities. For the solute 2AHBC, ground state complex formation does not hold in our study. The kinetic distance (r) value was found to be greater than the encounter distance (R) and indicated that the quenching reaction was held within the sphere of action...
June 19, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29920921/expression-of-genes-encoding-the-luciferase-from-photobacterium-leiognathi-in-escherichia-coli-rosetta-de3-and-its-application-in-nadh-detection
#16
Guanhua Xuan, Qilin Xiao, Jingxue Wang, Hong Lin, Tushar Pavase
Cloning of genes encoding the luciferase from Photobacterium leiognathi YL in Escherichia coli Rosetta (DE3) was performed successfully and the expressed forms of lux AB were purified to homogeneity. Experimental measurements revealed that luciferase from Photobacterium leiognathi YL has good thermal stability and a high residual activity at extreme pH values, which are extremely important for its various ecological, industrial and medical applications. Furthermore, we made a first attempt for quantitative detection of NADH by recombinant E...
June 19, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29900660/a-sensitive-sers-quantitative-analysis-method-for-ni-2-by-the-dimethylglyoxime-reaction-regulating-a-graphene-oxide-nanoribbon-catalytic-gold-nanoreaction
#17
Aihui Liang, Xin Li, Xinghui Zhang, Guiqing Wen, Zhiliang Jiang
The nanogold reaction between HAuCl4 and trisodium citrate (TCA) proceeded very slowly at 60°C in a water bath. The as-prepared graphene oxide nanoribbons (GONRs) exhibited strong catalysis during the reaction to form gold nanoparticles (Au NPs) and appeared as a strong surface-enhanced Raman scattering (SERS) peak at 1616 cm-1 in the presence of the molecular probe Victoria blue 4R (VB4r). With increase in GONR concentration, the SERS peak increased due to increased formation of Au NPs. Upon addition of dimethylglyoxime (DMG) ligand, which was adsorbed onto the GONR surface to inhibit GONR catalysis, the SERS peak decreased...
June 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29900656/recent-progress-in-the-development-of-fluorescent-probes-for-hydrazine
#18
REVIEW
Khac Hong Nguyen, Yuanqiang Hao, Wansong Chen, Yintang Zhang, Maotian Xu, Minghui Yang, You-Nian Liu
Hydrazine (N2 H4 ) is an important and commonly used chemical reagent for the preparation of textile dyes, pharmaceuticals, pesticides and so on. Despite its widespread industrial applications, hydrazine is highly toxic and exposure to this chemical can cause many symptoms and severe damage to the liver, kidneys, and central nervous system. As a consequence, many efforts have been devoted to the development of fluorescent probes for the selective sensing and/or imaging of N2 H4 . Although great efforts have been devoted in this area, the large number of important recent studies have not yet been systematically discussed in a review format so far...
June 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29900644/luminescence-and-structural-characterization-on-praseodymium-pr3-doped-potassium-bromide-kbr-single-crystals
#19
Bangaru Subban, Roobanguru Dhanraj
The luminescence properties of praseodymium (Pr3+ ) ion in potassium bromide (KBr) host have been investigated. The excitation bands observed in the region 220-300 nm are attributed to the transitions from 4f level to the 5d crystal field splitting levels of Pr3+ ion. Emission bands originated due to transition of 3 P2 →3 H6 (564 nm), 3 P0 →3 H6 (604 nm), 1 D2 →3 P4 (721 nm) and 3 P0 →3 F2 (659 nm) have been observed. Optical absorption, photoluminescence (PL) and thermoluminescence (TL) studies confirms the trivalent state of Pr3+ ion in KBr host...
June 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29851221/2-4-ethoxy-phenyl-4-phenyl-quinoline-organic-phosphor-for-solution-processed-blue-organic-light-emitting-diodes
#20
Minakshi Ghate, N Thejo Kalyani, S J Dhoble
This paper reports the synthesis and characterization of 2-(4-ethoxyphenyl)-4-phenyl quinoline (OEt-DPQ) organic phosphor using an acid-catalyzed Friedlander reaction and the preparation of blended thin films by molecularly doping OEt-DPQ in poly(methyl methacrylate) (PMMA) at different wt%. The molecular structure of the synthesized phosphor was confirmed by Fourier transform infra-red (FTIR) spectroscopy and nuclear magnetic resonance spectra (NMR). Surface morphology and percent composition of the elements were assessed by scanning electron microscopy (SEM) and energy dispersive analysis of X-rays (EDAX)...
May 31, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
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