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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/29124899/simeprevir-oxidative-degradation-product-molecular-modeling-in-silico-toxicity-and-resolution-by-synchronous-spectrofluorimetry
#1
Khalid A M Attia, Nasr M El-Abasawi, Ahmed El-Olemy, Ahmed Serag
In this article, one of the potential degradation products of the novel antiviral drug simeprevir was isolated and characterized by means of infrared (IR) and mass spectrometry. Moreover, comparative molecular docking, ADMET (absorption, distribution, metabolism, excretion - toxicity) and insilico toxicity prediction studies were applied to evaluate the activity of simeprevir and its degradation product. Furthermore,a simple, accurate and selective second derivative synchronous spectrofluorimetric method was developed for the determination of simeprevir in the presence of its oxidative degradation product...
November 10, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29124884/utility-of-cremophor-rh-40-as-a-micellar-improvement-for-spectrofluorimetric-estimation-of-sorafenib-in-pure-form-commercial-preparation-and-human-plasma
#2
Dalia W Zidan, Manal S Elmasry, Wafaa S Hassan, Abdalla A Shalaby
An easy, quick, simple and accurate spectrofluorimetric method was recognized and validated for evaluation of sorafenib (SOR) in pure form and biologically in plasma. Cremophor RH 40 (Cr RH 40) used for enhancing the fluorescence activity of SOR in phosphate buffer (pH 7). Cr RH 40 improved the native fluorescence of SOR remarkably in water. The fluorescence spectrum of SOR was observed at 405 nm after excitation at 265 nm. The linearity appeared to be in the range of 5 to 600 ng ml(-1) for pure and from 9 to 500 ng ml(-1) for plasma using the protein precipitation (ppt) method while from 10 to 500 ng ml(-1) for plasma using liquid-liquid extraction method...
November 10, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29115039/spectroscopic-determination-of-succinylcholine-in-dosage-forms-using-eosin-y
#3
Magda M Ayad, Fathalla Belal, Mervet M Hosney, Samah Abo El Abass, Nora Elsayed
Two simple and sensitive analytical assay methods using spectrophotometry and spectrofluorimetry techniques were developed for the estimation of succinylcholine chloride (SUC) in pharmaceutical preparations. The suggested methods are based on the formation of an ion pair complex formed between the drug and eosin Y spectrophotometrically (Method I), or the suppressive effect of succinylcholine on the native fluorescence property of eosin Y (Method II). The spectrophotometric method (Method I) involves measuring the absorbance of the complex between succinylcholine and eosin Y at 550 nm in Britton Robinson buffer of pH 3...
November 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29115007/enhancement-effect-on-the-chemiluminescence-of-acridinium-esters-under-neutral-conditions
#4
Manabu Nakazono, Shinkoh Nanbu
Enhancement effect on the chemiluminescence of acridinium ester derivatives under neutral conditions was investigated. Additions of phenols did not enhance the chemiluminescence intensities of acridinium ester derivatives in the presence of horseradish peroxidase and hydrogen peroxide. Additions of cetyltrimethylammonium bromide apparently enhanced the chemiluminescence intensities of phenyl 10-methyl-10λ(4) -acridine-9-carboxylate derivatives with electron-withdrawing groups at the 4-position of the phenyl group...
November 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29094493/comparison-of-the-thermostability-of-recombinant-luciferases-from-brazilian-bioluminescent-beetles-relationship-with-kinetics-and-bioluminescence-colours
#5
Gabriela Oliveira, Vadim R Viviani
Firefly luciferases have been used extensively as bioanalytical reagents and their cDNAs as reporter genes for biosensors and bioimaging, but they are in general unstable at temperatures above 30°C. In the past few years, efforts have been made to stabilize some firefly luciferases for better application as analytical reagents. Novel luciferases from different beetle families, displaying distinct bioluminescence colours and kinetics, may offer desirable alternatives to extend the range of applications. In the past years, our group has cloned the largest variety of luciferases from the three main families of bioluminescent beetles (Elateridae: P...
November 2, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29094470/fabrication-of-nitrogen-and-phosphorous-doped-carbon-dots-by-the-pyrolysis-method-for-iodide-and-iron-iii-sensing
#6
Soumen Chandra, Angshuman Ray Chowdhuri, Dipranjan Laha, Sumanta Kumar Sahu
A facile and novel strategy to synthesize nitrogen- and phosphorous-doped carbon dots (NPCDs) by single step pyrolysis method is described here. Citric acid is used as carbon source and di-ammonium hydrogen phosphate is used as both nitrogen and phosphorous sources, respectively. Through the extensive study on optical properties, morphology and chemical structures of the synthesized NPCDs, it is found that as-synthesized NPCDs exhibited good excitation-dependent luminescence property, spherical morphology and high stability...
November 2, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29094465/a-sensitive-fluorescence-quenching-method-for-the-detection-of-tartrazine-with-acriflavine-in-soft-drinks
#7
Huan Yang, Guihua Ran, Jingjing Yan, Hui Zhang, Xiaoli Hu
In this work, a simple, rapid, sensitive, selective spectrofluorimetric method was applied to detect tartrazine. The fluorescence of acriflavine could be efficiently quenched by tartrazine. The method manifested real time response as well as presented satisfied linear relationship to tartrazine. The linear response range of tartrazine (R(2) = 0.9995) was from 0.056 to 5 μmol L(-1) . The detection limit (3σ/k) was 0.017 μmol L(-1) , indicating that this method could be applied to detect traces of tartrazine...
November 2, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29094459/a-novel-spectrofluorimetric-method-for-determination-of-imatinib-in-pure-pharmaceutical-preparation-human-plasma-and-human-urine
#8
Dalia W Zidan, Wafaa S Hassan, Manal S Elmasry, Abdalla A Shalaby
The following paper represents a simple, highly sensitive, responsive validated and developed spectrofluorimetric method for estimation of imatinib (IMB) in its pure, commercial preparation, human urine and human blood plasma. The calibration curve was in the range 4-900 ng ml(-1) for pure form and urine and 8-900 ng ml(-1) for plasma in a medium contains carboxymethyl cellulose (CMC) and acetate buffer (pH 5) with excitation wavelength (λex ) 230 nm and emission wavelength (λem ) 307 nm. The limit of detection (LOD) was 0...
November 2, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29071786/synthesis-and-characterization-of-kce-po3-4-doped-with-some-lanthanide-activators
#9
Sharmila U Bhonsule, Sangeeta P Wankhede, Sanjiv V Moharil
KCe(PO3 )4 doped with Dy(3+) ,Tb(3+) ,Yb(3+) and Nd(3+) phosphors were synthesized by a solid state diffusion method. The prepared samples were characterized by X-ray diffraction and photoluminescence. KCe(PO3 )4 exhibits emission in ultraviolet (UV) region which indicates weak Ce(3+) -Ce(3+) interaction. The Ce(3+) -Ce(3+) energy transfer is not efficient. In light of this, energy transfer from Ce(3+) to other lanthanides like Dy(3+) , Tb(3+) ,Yb(3+) and Nd(3+) is rather surprising.
October 25, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29071785/simultaneous-determination-of-amlodipine-and-metoprolol-in-their-combined-dosage-form-using-a-synchronous-fluorescence-spectrofluorimetric-method
#10
Mokhtar M Mabrouk, Sherin F Hammad, Samah F El-Malla, Eman A Elshenawy
Highly sensitive, rapid, accurate and precise synchronous fluorescence spectrofluorimetric method has been developed for simultaneous analysis of a mixture of amlodipine (AMD) and metoprolol (MET). The method relies on measuring the relative synchronous fluorescence intensity of both drugs at Δλ of 90 nm in acetate buffer solution at pH 5. The experimental parameters influencing the developed method were investigated and optimized. The method was linear over the ranges 0.2-2 μg/ml and 0.5-10 μg/ml for AMD and MET, respectively...
October 25, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29068523/a-carbonothioate-based-highly-selective-fluorescent-probe-with-a-large-stokes-shift-for-detection-of-hg-2
#11
Jing Xu, Zhenghe Xu, Zuokai Wang, Caiyun Liu, Baocun Zhu, Xiuru Wang, Kun Wang, Jiangting Wang, Guoqing Sang
Mercury (Hg) is one of the heavy metal pollutants in the environment. Even a very small amount of mercury can cause serious harm to human beings. Herein, we reported a new carbonothioate-based fluorescent probe for the detection of Hg(2+) without interference from other metal ions. This probe possessed a very large Stokes shift (192 nm), which could improve the detection sensitivity by minimizing the interferences resulted from self-absorption or auto-fluorescence. With the addition of Hg(2+) to the probe solution, considerable fluorescence enhancement was observed...
October 25, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29067748/the-determination-of-nitrite-by-a-graphene-quantum-dot-fluorescence-quenching-method-without-sample-pretreatment
#12
Li Jin, Ying Wang, Fangtong Liu, Shihua Yu, Yan Gao, Jianpo Zhang
A method for quantitative analysis of nitrite was achieved based on fluorescence quenching of graphene quantum dots. To obtain reliable results, the effects of pH, temperature and reaction time on this fluorescence quenching system were studied. Under optimized conditions, decrease in fluorescence intensity of graphene quantum dots (F0 /F) showed a good linear relationship with nitrite concentration between 0.007692-0.38406 mmol/L and 0.03623-0.13043 μmol/L; the limits of detection were 9.8 μmol/L and 5.4 nmol/L, respectively...
October 25, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29058364/enhanced-red-emission-from-bamoo4-eu-3-by-bi-3-co-doping
#13
Wenqin Luo, Danping Ling, Susu Bao, Huifang Xiong, Rui Zhang, Bin Li, Haiyan Wu
A series of Bi(3+) ,Eu(3+) -doped BaMoO4 phosphors was synthesized using a hydrothermal method. The crystal structure, morphology and optical properties of the phosphors were studied using X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence (PL) measurements. Three different particle morphologies were detected in the SEM observation. The energy dispersive spectroscopy (EDS) results indicated that the solubility of Bi(3+) in spherical or rugby-like BaMoO4 particles was very low and the excess Bi(3+) element was cumulated in the irregular particles...
October 23, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29052335/a-comparative-study-on-intrinsic-fluorescence-of-bsa-and-lysozyme-proteins-in-presence-of-different-divalent-ions-from-their-solution-and-thin-film-conformations
#14
Ashim Chandra Bhowal, Sarathi Kundu
Optical emission behaviours of lysozyme and bovine serum albumin, from bulk and thin film geometry, were studied in the presence of three different divalent ions (Mg(2+) , Ca(2+) or Ba(2+) ) using different spectroscopic [steady-state fluorescence, UV-Vis and Fourier transform infra-red (FTIR)] techniques. Additionally, protein thin films on silicon surfaces were prepared and morphological studies were carried out using atomic force microscopy. Dynamic quenching was mainly identified for both proteins in the presence of Mg(2+) , Ca(2+) and Ba(2+) ions...
October 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29045035/nitrogen-doped-carbon-dots-as-a-fluorescent-probe-for-the-highly-sensitive-detection-of-ag-and-cell-imaging
#15
Junjian Li, Gancheng Zuo, Xihao Pan, Wei Wei, Xiaoliang Qi, Ting Su, Wei Dong
An easy hydrothermal synthesis strategy was applied to synthesize green-yellow emitting nitrogen-doped carbon dots (N-CDs) using 1,2-diaminobenzene as the carbon source, and dicyandiamide as the dopant. The nitrogen-doped CDs resulted in improvement in the electronic characteristics and surface chemical activities. N-CDs exhibited bright fluorescence emission and could response to Ag(+) selectively and sensitively. Other ions produced nearly no interference. A N-CDs based fluorescent probe was then applied to sensitively determine Ag(+) with a detection limit of 5 × 10(-8)  mol/L...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29044986/spectroscopic-investigation-of-the-anticancer-alkaloid-piperlongumine-binding-to-human-serum-albumin-from-the-viewpoint-of-drug-delivery
#16
Yu Liu, Qian-Yu Li, Yu-Ping Wang, Yi-Ming Liu, Bin Liu, Mei-Mei Liu, Bing-Mi Liu
Piperlongumine (PL) is a very promising natural agent with a high potential for cancer treatment. To overcome the poor water solubility of PL, there is a need to develop a novel water-soluble formulation in which PL is non-covalently bound to human serum albumin (HSA). PL binding to HSA was studied by various spectroscopic techniques under simulated physiological conditions. Spectroscopic evidence showed that the interaction of PL with HSA could form a PL-HSA complex. The binding constant (Ka ) values increased with increasing temperature, and a similar dependence was observed for the number of binding sites (n) values...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29044942/highly-luminescent-nitrogen-doped-carbon-dots-for-simultaneous-determination-of-chlortetracycline-and-sulfasalazine
#17
Zhengwei Zhang, Jianqiu Chen, Yu Duan, Weixia Liu, Dan Li, Zhengyu Yan, Ke Yang
Here, we have presented a green and facile strategy to fabricate nitrogen-doped carbon dots (N-CDs) and their applications for determination of chlortetracycline (CTC) and sulfasalazine (SSZ). The fluorescent N-CDs, prepared by one-step hydrothermal reaction of citric acid and l-arginine, manifested numerous excellent features containing strong blue fluorescence, good water-solubility, narrow size distribution, and a high fluorescence quantum yield (QY) of 38.8%. Based on the fluorescence quenching effects, the as-synthesized N-CDs as a fluorescent nanosensor exhibited superior analytical performances for quantifying CTC and SSZ...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29044939/synthesis-and-characterization-of-high-quantum-yield-and-oscillator-strength-6-chloro-2-4-cynophenyl-4-phenyl-quinoline-cl-cn-dpq-organic-phosphor-for-solid-state-lighting
#18
Minakshi Ghate, H K Dahule, N Thejo Kalyani, S J Dhoble
A novel blue luminescent 6-chloro-2-(4-cynophenyl) substituted diphenyl quinoline (Cl-CN DPQ) organic phosphor has been synthesized by the acid-catalyzed Friedlander reaction and then characterized to confirm structural, optical and thermal properties. Structural properties of Cl-CN-DPQ were analyzed by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction technique (XRD) and scanning electron microscopy (SEM) and energy dispersive analysis of X-ray (EDAX) spectroscopy...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29044910/colorimetric-detection-of-oxalate-in-aqueous-solution-by-a-pyrogallol-red-based-cu-2-complex
#19
Koshiro Inoue, Shunichi Aikawa, Yasumasa Fukushima
The pyrogallol red (PR)-based Cu(2+) complex was proven to be an effective and selective colorimetric chemosensing ensemble for recognition of oxalate over other anions in a perfect aqueous solution. The addition of oxalate to the PR-Cu(2+) complex resulted in a colour change from purple to orange colour due to the regeneration of PR by the chelation of oxalate with Cu(2+) , while other anions did not induce any significant colour change. Moreover, it was revealed that no obvious interference was observed during the titrations with oxalate into each other anion...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29024360/synthesis-of-carbon-based-quantum-dots-from-starch-extracts-optical-investigations
#20
Y Al-Douri, N Badi, C H Voon
Carbon-based quantum dots (C-QDs) were synthesized through microwave-assisted carbonization of an aqueous starch suspension mediated by sulphuric and phosphoric acids. The as-prepared C-QDs showed blue, green and yellow luminescence without the addition of any surface-passivating agent. The C-QDs were further analyzed by UV-vis spectroscopy to measure the optical response of the organic compound. The energy gaps revealed narrow sizing of C-QDs in the semiconductor range. The optical refractive index and dielectric constant were investigated...
October 12, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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