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Journal articles on the topic 'Stability constant of thiocyanic acid'

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Published: 4 June 2021
Last updated: 13 February 2022

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1

Loryuenyong, Vorrada, Peeranut Kulchartchai, Phatsawat Audomcharoensak, Penpaka Jeyakom, and Achanai Buasri. "Effects of Mixed Halide Ions Incorporation on CH3NH3Pb(I,Br)3-x(SCN)x Perovskite Films via Solution Deposition Route." Key Engineering Materials 821 (September 2019): 395–400. http://dx.doi.org/10.4028/www.scientific.net/kem.821.395.

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Nowadays, a novel solar cell based on an organolead halide perovskite structure, CH3NH3PbX3 (X is a halogen), has been gained a great attraction due to its promising photovoltaic performance. However, their humidity limitation is a serious drawback, which limits practical application of perovskite-based solar cells. In this study, we investigated the improvement of humidity stability and the influence of halide radicals (I- and Br-) on optical and physical properties of thiocyanic-modified CH3NH3PbX3 or CH3NH3PbX3-x(SCN)x films, prepared by two-step deposition method. The mixtures of CH3NH3I a
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2

Pitluck, Mark R., Bruce D. Pollard, and Daniel T. Haworth. "Conditional Stability Constant Determination of Metal-Fulvic Acid Complexes." Journal of Liquid Chromatography 10, no. 10 (1987): 2081–103. http://dx.doi.org/10.1080/01483918708068897.

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3

Haworth, Daniel T., Mark R. Pitluck, and Bruce D. Pollard. "Conditional Stability Constant Determination of Metal Aquatic Fulvic Acid Complexes." Journal of Liquid Chromatography 10, no. 13 (1987): 2877–89. http://dx.doi.org/10.1080/01483918708066833.

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4

LIU, Shaoqian, Zhengfa FANG, Zhanghong YANG, Heda DONG, and Si HUANG. "Improvement of Stability Constant Determination of Sulfosalicylic Acid-Copper (Ⅱ) Complex." University Chemistry 33, no. 3 (2018): 59–62. http://dx.doi.org/10.3866/pku.dxhx201709038.

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5

Mesmin, C., and J. ‐O Liljenzin. "Determination of H2TPTZ22+Stability Constant by TPTZ Solubility in Nitric Acid." Solvent Extraction and Ion Exchange 21, no. 6 (2003): 783–95. http://dx.doi.org/10.1081/sei-120025922.

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6

Apriani, Elsa Fitria, Novi Nurleni, Hervianti Nurfitria Nugrahani, and Iskandarsyah Iskandarsyah. "STABILITY TESTING OF AZELAIC ACID CREAM BASED ETHOSOME." Asian Journal of Pharmaceutical and Clinical Research 11, no. 5 (2018): 270. http://dx.doi.org/10.22159/ajpcr.2018.v11i5.23218.

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Objective: Azelaic acid as an antibacterial to Propionibacterium acnes bacteria in recent years began to develop as an anti-acne using lipid bilayer vesicles to increase the penetration of azelaic acid to reach sebaceous tissue which is located in the dermis of skin where the growth of bacteria P. acnes. The development of azelaic acid in lipid bilayer vesicles is also due to the absorption of azelaic acid from cream preparations by only 4%. Azelaic acid gel based ethosomes also known give a larger zone of inhibition than azelaic acid creams and gels in the market. Methods: Preparation stabili
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7

PEREIRA, F. C., and F. J. S. LIMA. "A NEW METHOD FOR CONSTANT ESTIMATE STABILITY OF COMPLEX WITH EDTA." Periódico Tchê Química 16, no. 33 (2019): 148–58. http://dx.doi.org/10.52571/ptq.v16.n33.2019.163_periodico33_pgs_148_158.pdf.

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The present work describes a new methodology in analytical chemistry, which makes it possible to calculate the stability constant (equilibrium or formation) of the coordination compounds generated between all metallic cations in the periodic table, except for alkali metals (group 1 ) together with the ethylene diamine tetraacetic acid binder. The system is simple to use, inexpensive, and allows the knowledge of the size of the conditional formation constants for all metals coordinated with the complexing agent to be investigated at any pH value investigated. In addition, the method is also ext
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8

Abaas Gaasm, Luma. "A Study of the thermodynamic parameters (functions) of complexes formation of Sulfanilamid with metal ions and DL-Alanine by potentiometric method." Tikrit Journal of Pure Science 24, no. 3 (2019): 59. http://dx.doi.org/10.25130/j.v24i3.818.

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The current study deals with the preparation of disulfonalmide complexes composed of the sulfanilamid drug , the salt of chromium(III) and the trisulfonalmide complexes composed of the sulfonalmide drug , the metal salt and the amino acid (alanin), as well as study in the stability constant of each complex and making a comparison between them . The obtained results show that the tricomplex stability constant is higher than the dicomplex stability constant due to the existence of the amino acid in the tricomplex which makes greater stereo structure and eventually easier interaction. Besides the
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9

Špringer, Vladimír, Magdaléna Horňáčková, Rolf Karlíček, and Božena Kopecká. "Salicylhydroxamic acid and its iron(III) complexes." Collection of Czechoslovak Chemical Communications 52, no. 3 (1987): 602–8. http://dx.doi.org/10.1135/cccc19870602.

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The dissociation constants of salicylhydroxamic acid (H2L), pKa1 = 6.73 and pKa2 = 9.15 (20 °C, I = 1.0 (NaClO4)), and the stability constant of the FeHL2+ complex, logβ = 9.09, were determined by the potentiometric and spectrophotometric methods. The low-soluble Fe(OH)(HL)2.3 H2O complex was also isolated. The reagent can be conveniently used as an indicator for the chelometric determination of iron.
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10

Pandeya, S. B., and A. K. Singh. "Discontinuous spectrocolorimetric titration method for determining stability constants of fulvic acid - iron complexes." Soil Research 35, no. 6 (1997): 1279. http://dx.doi.org/10.1071/s96091.

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The stability constants for the complexes formed between iron species existing in ambient soil environment and fulvic acids (FA) extracted from organic wastes like sewage sludge, farm yard manure (FYM), poultry manure, and press mud were determined in aqueous media of pH 5·0 and 8·5 by discontinuous spectrocolorimetric titration method. The values of stability constant (log K) of Fe–FA complexes estimated at pH 5·0 were 6·026, 6·212, 6·270, and 6·342 for FYM, sludge, poultry manure, and press mud, respectively. The respective values at pH 8·5 were 6·145, 6·276, 6·350, and 6·940. The order of t
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11

Hameed, Ghusoon Faidhi, Fawzi Yahya Wadday, and Nahla Shakir Salman. "Modeling and Thermodynamic Values of Complex Equilibrium of Cobalt(II) with Diethylenetriaminepentaacetic Acid in Aqueous Solution." Indonesian Journal of Chemistry 21, no. 3 (2021): 644. http://dx.doi.org/10.22146/ijc.59169.

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The paper reports the study of the complex formation of cobalt (II) with diethylenetriaminepentaacetic acid (DTPA, H5L) based on spectrophotometric (SF) and potentiometric data (pH). Complexes of different compositions were found, and equilibrium constants, as well as the stability constants of these complexes, were determined. Accumulation of complexes in proportion is calculated based on the acidity of the medium. The experimental data have been carried out by using mathematical models to assess the solution's possible existence with a wide spectrum of complex particles and to point out thos
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12

Journal, Baghdad Science. "Stability constant measurements of thorivm (lv) and uranyle ions with some amino acids." Baghdad Science Journal 1, no. 1 (2004): 8–12. http://dx.doi.org/10.21123/bsj.1.1.8-12.

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13

Kennedy, William R., and Dale W. Margerum. "Stability constant and reaction mechanisms of the nickel(II)-tripeptide complex of .alpha.-aminoisobutyric acid." Inorganic Chemistry 24, no. 16 (1985): 2490–95. http://dx.doi.org/10.1021/ic00210a007.

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14

Majid, Yaha A., Bassima M. Sarhane, and Nada A. Al-Najjar. "STABILITY CONSTANT OF SOME METAL ION OF COMPLEXES (4-AMINO HIPPURIC ACID) IN AQUEOUS SOLUTIONS." Journal of Al-Nahrain University Science 10, no. 2 (2007): 89–96. http://dx.doi.org/10.22401/jnus.10.2.16.

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15

Vukovic, Jasna, Branislav Bozic, Manfred Lechner, and Slobodan Jovanovic. "Thermal stability of aliphatic hyperbranched polyesters." Chemical Industry 56, no. 11 (2002): 473–77. http://dx.doi.org/10.2298/hemind0211473v.

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The influence of the molar mass (generation), number and type of end groups on the thermal stability of aliphatic hyperbranched polyesters are presented in this study. Different end groups were obtained by modification of the samples with chlorides of propionic acid and stearic acid. The thermal stability of the hyperbranched polyesters was determined by thermogravimetry using a NET-ZSCH TG 209 instrument in nitrogen atmosphere at a heating rate of 10?C/min. A comparison of the temperatures obtained for mass losses of 5 20 and 40 wt% for unmodified samples showed that the thermal stability inc
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16

Schmidt, Holger, Andreas Wilden, Giuseppe Modolo, Jaroslav Švehla, Bohumir Grüner, and Christian Ekberg. "Gamma radiolytic stability of CyMe4BTBP and the effect of nitric acid." Nukleonika 60, no. 4 (2015): 879–84. http://dx.doi.org/10.1515/nuka-2015-0156.

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Abstract The highly selective nitrogen donor ligand CyMe4BTBP for An(III) separation by solvent extraction was irradiated in a 60Co γ-source under varying conditions. Organic solutions of 10 mmol/L ligand in 1-octanol were contacted with different concentrations of nitric acid to observe the influence of an aqueous phase during irradiation. In subsequent liquid-liquid extraction experiments, distribution ratios of 241Am and 152Eu were determined. Distribution ratios decreased with increasing absorbed dose when irradiation was performed in the absence of nitric acid. With addition of nitric aci
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17

Yang, Yun Feng, Guo Sheng Hu, and Yin Jie Chen. "The Study of Oxidative Stability of Castor Oil Based Biodiesel." Advanced Materials Research 724-725 (August 2013): 334–37. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.334.

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The oxidative stability of castor oil based biodiesel, added different antioxidant, was studied systematacially through pressure differential scanning calorimetry (PDSC), accelerated oxidation test, constant temperature method, programmed temperature method. The result shows after adding antioxidant in castor oil, the generation of hyperoxide and acid value were suffocated for the biodiesel. When the content of antioxidant 300 was 0.6 wt.%, the initiation oxide temperature raised to 197.7°C, the acid value reduced to 1.41, the solubility of oxide reduced to 1.40mg/100mL, and the activity energ
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18

Sastry, S. Sreehari, L. Tanuj Kumar, T. Vishwam, V. R. K. Murthy, S. Lakshminaryana, and Ha Sie Tiong. "Dielectric Studies on Fe3O4Nanodopedp-n-Alkyloxybenzoic Acids." Advances in Condensed Matter Physics 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/639259.

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The stability of phase transition temperatures and textural changes for thermotropic pure and nanodopedp-n-alkyloxybenzoic acid mesogens were aimed to study at considerable time periods. Frequency and temperature dependent dielectric constant and dielectric loss for the pure and nanodoped liquid crystals were carried out. Significant anomalies in dielectric studies were observed near phase transitions when dielectric constant and dielectric loss had been measured as a function of temperature and frequency. Changes in dielectric constant and loss were observed and there were no apparent changes
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19

Weger, Harold G., Jackie Lam, Nikki L. Wirtz, Crystal N. Walker, and Ron G. Treble. "High stability ferric chelates result in decreased iron uptake by the green alga Chlorella kessleri owing to decreased ferric reductase activity and chelation of ferrous iron." Botany 87, no. 10 (2009): 922–31. http://dx.doi.org/10.1139/b09-063.

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Cells of the green alga Chlorella kessleri Fott et Nováková use a reductive mechanism for iron acquisition. Iron-limited cells acquired iron more rapidly from a chelator with a lower stability constant for Fe3+ (hydroxyethylethylenediaminetriacetic acid (HEDTA)) than from a chelator with a higher stability constant (N,N′-di[2-hydroxybenzyl)ethylenediamine-N,N′-diacetic acid (HBED)). Furthermore, iron uptake rates decreased with increasing chelator concentrations at constant iron concentration. The negative effects of elevated HBED levels on iron uptake could be partly alleviated by the additio
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20

Ren, Jie, Yin Shan Lou, Hai Kuan Yuan, and Lian Shen. "Relationships Between Acidity and Catalytic Performance of Solid Acid in Synthesis of Linear Alkyl Benzene (LAB)." Advanced Materials Research 233-235 (May 2011): 1447–50. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1447.

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Through the benzene alkylation experiments with long chain olefin over solid acid catalysts activated at different temperature in the fixed-bed reactor, the kinetics of alkylation reaction and the deactivation kinetics of catalyst were established. The results showed that the activity and stability of catalyst decreased with increasing the activation temperature of catalysts. The reaction rate constant (k) and the deactivation rate constant (kd) of catalyst in kinetic models were also estimated through the optimization method, respectively. The acidity of catalyst was characterized by ammonia
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21

Johansson, O., and M. Wedborg. "Determination of the stability constant for acetic acid in synthetic seawater media at various temperatures and salinities." Journal of Solution Chemistry 14, no. 6 (1985): 431–39. http://dx.doi.org/10.1007/bf00643946.

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22

Suyanta, Suyanta, Sri Sudiono, and Sri Juari Santosa. "DETERMINATION OF RATE CONSTANT AND STABILITY OF ADSORPTION IN COMPETITIVE ADSORPTION OF Cr(III) AND Cd(II) ON HUMIC ACID BY USING THE NEW MODEL OF KINETIC FORMULATION." Indonesian Journal of Chemistry 4, no. 3 (2010): 161–67. http://dx.doi.org/10.22146/ijc.21847.

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Determination of rate and stability constants of adsorption in competitive adsorption of Cr(III) and Cd(II) on humic acid by using the new model of kinetic formulation has been done. The new model based on assumption that those adsorption was first order adsorption rearched equilibrium. Humic acid was isolated from Peat moss of Silaut- West Sumatra by modificated Schnitzer method. Humic acid characterization was conducted by using infrared spectrophotometer with KBR pellet method. The experiment of kinetic adsorption was conducted in batch system reactor using erlenmeyer at 25 ± 0.01 oC of wat
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23

Kavitha, Govindarajan, Parasuraman Vijaya Rohini, and Sunkubangaru Sudarsan Alwar. "Potentiometric Studies of Binary Complexes of Transition Metal Ions with Lauric Acid." Oriental Journal of Chemistry 34, no. 5 (2018): 2681–84. http://dx.doi.org/10.13005/ojc/340564.

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The potentials of binary complexes of the Lauric acid ligand with various biologically vital divalent metal ions such as Mn(II), Co(II), Ni(II), Cu(II)and Zn(II) have been studied in 50% DMSO-water mixture at constant ionic strength by Bjerrum method. Hydrogen ion concentrations were measured and the formation of binary complexes was inferred from the corresponding potentiometric pH-titration curves. The metal to ligand mole ratio was maintained at 1:5 to facilitate the maximum number of ligands to the metal ion. The dissociation constant has been determined by the half-integral method and poi
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24

Shehate, Mohamed, Mohamed Shoukry, and Mona Ragab. "The interaction of [Pd(N,N-dimethylaminopropylamine)(H2O)]2+ with dicarboxylic acids and inosine: Thermodynamic model for carboplatin drug." Open Chemistry 10, no. 4 (2012): 1253–61. http://dx.doi.org/10.2478/s11532-012-0053-y.

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AbstractThe Pd(DMPA)Cl2 complex, where DMPA = N,N-dimethylaminoproylamine, was synthesized and characterized. The stoichiometry and stability constants of the complexes formed between various dicarboxylic acids and [Pd(DMPA)(H2O)2]2+ were investigated. The effect of solvent dielectric constant, chloride ion concentration of the medium and temperature on the stability constant of the cyclobutanedicaroxylic acid (CBDCA) complex was investigated. The equilibrium constants for the displacement of coordinated CBDCA by inosine, taken as an example of DNA constituents, were calculated. The results ar
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25

Tomar, Sapna, and Padma Sikarwar. "A Potentiometric Studies of Ternary Complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Ethylenediaamine-N,N,N1,N1-Tetraacetic Acid and Melonic Acid." Oriental Journal of Chemistry 34, no. 6 (2018): 2782–88. http://dx.doi.org/10.13005/ojc/340614.

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Potentiometeric investigation on the complex formation equilibria involving Co(II), Ni(II), Cu(II) & Zn(II) with ethylenediaamine-N,N,N1,N1-tetraacetic acid and melonic acid have been made in solution at three different temps viz. (150, 350, 450C). Important thermodynamic parameters namely, change in Gibb’s free energy (DG0), change in enthalpy (DH0) and change in entropy (DS0) and stability constant have been determined potentiometrically at ionic strength of 0.1 M (KNO3).
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26

Anderegg, Giorgio, Francoise Arnaud-Neu, Rita Delgado, Judith Felcman, and Konstantin Popov. "Critical evaluation of stability constants of metal complexes of complexones for biomedical and environmental applications* (IUPAC Technical Report)." Pure and Applied Chemistry 77, no. 8 (2005): 1445–95. http://dx.doi.org/10.1351/pac200577081445.

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Available experimental data on stability constants of proton (hydron) and metal complexes for seven complexones of particular biomedical and environmental interest: iminodiacetic acid [2,2'-azanediyldiacetic acid, IDA], (methylimino)diacetic acid [2,2'-(methylazanediyl)diacetic acid, MIDA]; 2,2',2'',2'''-{[(carboxymethyl)azanediyl]bis[(ethane-1,2-diyl)nitrilo]}tetraacetic acid (DTPA), 3,6,9,12-tetrakis(carboxymethyl)-3,6,9,12-tetraazatetradecanedioic acid (TTHA); 2,2',2''-(1,4,7-triazonane-1,4,7-triyl)triacetic acid (NOTA); 2,2',2'',2'''-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraac
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27

Kostic, Ivana, Tatjana Andjelkovic, Ruzica Nikolic, Tatjana Cvetkovic, Dusica Pavlovic, and Aleksandar Bojic. "Comparative study of binding strengths of heavy metals with humic acid." Chemical Industry 67, no. 5 (2013): 773–79. http://dx.doi.org/10.2298/hemind121107002k.

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The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by method which is based on distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert?s ion exchange method. Experiments were performed at 25 ?C, at pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log ?mn, of complexes formed between th
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28

Manikyamba, Prerepa. "Structural effects in the oxidation of ketones by acid iodate." Collection of Czechoslovak Chemical Communications 56, no. 6 (1991): 1279–86. http://dx.doi.org/10.1135/cccc19911279.

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The kinetics of oxidation of aliphatic, alicyclic and aryl alkyl ketones by acid iodate has been studied in aqueous methanol medium. The reaction exhibits first order dependence each on [iodate] and [ketone]. The reaction is acid catalysed and a medium of low dielectric constant is favourable for the oxidation process. The oxidation rates are slower than the enolisation rates of the ketones. The mechanism proposed involves rate limiting attack of IO+2 on the enol form of the ketone leading to the formation of an intermediate carbonium ion which undergoes solvolysis, ultimately leading to the f
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29

Şenel, Mehmet, Agah Coşkun, M. Fatih Abasıyanık, and Ayhan Bozkurt. "Immobilization of urease in poly(1-vinyl imidazole)/poly(acrylic acid) network." Chemical Papers 64, no. 1 (2010): 1–7. http://dx.doi.org/10.2478/s11696-009-0103-x.

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AbstractIn this study, urease was immobilized in a polymer network obtained by complexation of poly(1-vinyl imidazole) (PVI) with poly(acrylic acid) (PAA). Preparation of the polymer network was monitored by FT-IR spectroscopy. Scanning electron microscopy (SEM) revealed that enzyme immobilization had a strong effect on film morphology. Proton conductivity of the PVI/PAA network was measured via impedance spectroscopy under humidified conditions. Values of the Michaelis-Menten constant (K M) for immobilized urease were higher than for the free enzyme, indicating a decreased affinity of the enz
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30

Khan, Farid, and Afroza Khanam. "Study of complexes of cadmium with some L-amino acids and vitamin-C by voltammetric technique." Eclética Química Journal 33, no. 2 (2018): 29. http://dx.doi.org/10.26850/1678-4618eqj.v33.2.2008.p29-36.

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Voltammetric technique was used to study the binary and ternary complexes of cadmium with L-amino acids and vitamin-C (L-ascorbic acid) at pH =7.30 ± 0.01, μ = 1.0M KNO3 at 25ºC and 35ºC. Cd (II) formed 1:1:1, 1:1:2 and 1:2:1 complexes with L-lysine, L-ornithine, L-threonine, L-serine, L-phenylglycine, L-phenylalanine, L-glutamic acid and L-aspartic acid used as primary ligands and L-ascorbic acid used as secondary ligand. The trend of stability constant of complexes was Llysine < L-ornithine < L-threonine < L-serine < L-phenylglycine < L-phenylalanine < L-glutamic acid <
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31

Abualreish, Mustafa, and A. M. Al msiedeen. "Spectrophotometric determination of the stability constant of vanadium(v)-p-chloro-N-phenyl-p-chlorobenzo- hydroxamic acid complex." International Journal of Advanced Chemistry 2, no. 2 (2014): 162. http://dx.doi.org/10.14419/ijac.v2i2.3213.

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32

Yakovishin, Leonid A. "Molecular Complex of Glycyrrhizic Acid Monoammonium Salt with Cholesterol." Current Bioactive Compounds 16, no. 7 (2020): 1042–48. http://dx.doi.org/10.2174/1573407215666191007111603.

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Background: Glycyrrhizic Acid (GA) is the major triterpene saponin of licorice roots. The most important derivative of GA is its monoammonium salt (glycyram, GC). Some pharmacological properties of triterpene saponins explain their molecular complexation with Cholesterol (Chol). However, the molecular complexation of GC with Chol has not been proven. The functional groups of GA and GC involved in the interactions with Chol were not identified. Methods: The complexation has been investigated by the method of isomolar series in the spectrophotometric version, IR, and 13C NMR spectroscopy. The co
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33

Maruk, Alesya Ya, Valery V. Ragulin, Iurii A. Mitrofanov, et al. "Synthesis, Complexation Properties, and Evaluation of New Aminodiphosphonic Acids as Vector Molecules for 68Ga Radiopharmaceuticals." Molecules 26, no. 8 (2021): 2357. http://dx.doi.org/10.3390/molecules26082357.

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Two new aminodiphosphonic acids derived from salicylic acid and its phosphonic analogue were prepared through a simple and efficient synthesis. 2-[(2-Amino-2,2-diphosphono)ethyloxy]-benzoic acid 8 and 2-[(2-amino-2,2-diphosphono)ethyloxy]-5-ethyl-phenylphosphonic acid 9 were evaluated for their applicability as 68Ga binding bone-seeking agents. Protonation constants of 8 and 9 and stability constants of the Ga3+ complexes with 8 and 9 in water were determined. The stability constant of Ga3+ complex with fully phosphorylated acid 9 (logKGaL = 31.92 ± 0.32) significantly exceeds stability consta
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34

Hafner, M., M. Sulyok, R. Schuhmacher, C. Crews, and R. Krska. "Stability and epimerisation behaviour of ergot alkaloids in various solvents." World Mycotoxin Journal 1, no. 1 (2008): 67–78. http://dx.doi.org/10.3920/wmj2008.x008.

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In this paper the stability and degree of epimerisation of six major ergot alkaloids at three different temperature levels (-20 °C, +4 °C and +20 °C) over periods of 18 hours and six weeks is reported for the first time. The behaviour of ergometrine, ergocornine, ergocristine, α-ergocryptine, ergosine and ergotamine was thoroughly studied in seven solvents which are employed for the preparation of calibrants and extraction mixtures, respectively. Moreover, the stability of the ergot alkaloids was tested in different cereal extracts (rye, wheat, barley, oats) for 1, 2 and 6 days. Of the toxins
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35

Fialová, Marie, Jindřich Zahradník, and Hana Kučerová. "Design of continuous flow immobilized bacterial cells reactor for production of L-malic acid." Collection of Czechoslovak Chemical Communications 55, no. 9 (1990): 2192–98. http://dx.doi.org/10.1135/cccc19902192.

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An experimental study was carried out, aimed at establishing an engineering data base for the optimum design of a pilot-plant fixed bed reactor for continuous biotransformation of natrium fumarate to L-malic acid catalysed by immobilized bacterial cells. Cells Corynebacterium sp. immobilized in calcium alginate were used for experiments. Effective reaction kinetics including the effect of transport phenomena in the bed was determined and conditions of the safe conversion data scale up were defined. Regarding the requirements of continuous production, long-term stability of the biocatalytic sys
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36

Hosseini, Mohammad Saeid, and Sara Madarshahian. "Investigation of Charge Transfer Complex Formation Between Fe(III) and 2,6-Dihydroxy Benzoic Acid and its Applications for Spectrophotometric Determination of Iron in Aqueous Media." E-Journal of Chemistry 6, no. 4 (2009): 985–92. http://dx.doi.org/10.1155/2009/417303.

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On the basis of affinity of Fe(III) ions toward functional groups of 2,6-dihydroxy benzoic acid (2,6-DHB), a charge transfer complex (CT) is formed between Fe(III) ion and 2,6-DHB in acidic media. The stoichiometry and stability constant of the complex was determined using both mole ratio and Job’s methods. The stability constant of 1:1 complex formed in acidic media is 2.55±0.14×105(mole ratio) or 2.70±0.12×105(Job), in which the quantities are in agreement with together. This method was used for spectrophotometric determination of Fe(III) in aqueous media. The dynamic range and detection lim
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37

Pytela, Oldřich, Václav Vala, Miroslav Ludwig, and Miroslav Večeřa. "Modeling of hydrolysis mechanism of 3-hydroxytriazenes in strongly acidic medium." Collection of Czechoslovak Chemical Communications 51, no. 2 (1986): 347–57. http://dx.doi.org/10.1135/cccc19860347.

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Four derivatives of 3-hydroxy1-phenyl-3-alkyltriazene have been synthesized and their hydrolytic stability has been measured in sulphuric acid medium (0.2-16 mol l-1). The rate constant has been found to increase with increasing concentration of sulphuric acid at first, but, on the contrary, at higher concentrations it decreases. Twelve kinetic schemes of acid catalysis have been suggested and evaluated, and a probable mechanism of decomposition has been suggested which involves nitrenium ion as an intermediate.
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38

García-Díez, Guillermo, Roger Monreal-Corona, and Nelaine Mora-Diez. "Complexes of Copper and Iron with Pyridoxamine, Ascorbic Acid, and a Model Amadori Compound: Exploring Pyridoxamine’s Secondary Antioxidant Activity." Antioxidants 10, no. 2 (2021): 208. http://dx.doi.org/10.3390/antiox10020208.

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The thermodynamic stability of 11 complexes of Cu(II) and 26 complexes of Fe(III) is studied, comprising the ligands pyridoxamine (PM), ascorbic acid (ASC), and a model Amadori compound (AMD). In addition, the secondary antioxidant activity of PM is analyzed when chelating both Cu(II) and Fe(III), relative to the rate constant of the first step of the Haber-Weiss cycle, in the presence of the superoxide radical anion (O2•−) or ascorbate (ASC−). Calculations are performed at the M05(SMD)/6-311+G(d,p) level of theory. The aqueous environment is modeled by making use of the SMD solvation method i
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39

Obradovic, Mirjana, Slavica Sunaric, Snezana Mitic, and Dragan Veselinovic. "Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction." Journal of the Serbian Chemical Society 73, no. 11 (2008): 1113–22. http://dx.doi.org/10.2298/jsc0811113o.

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The reaction between NaAsO2 and oxalic acid was studied by pH-metric and conductometric measurements, applying the methods of continual variation and pH-metric and conductometric titration. It was found that oxalic acid forms a complex anion of the type [AsOC2O4]-. The relative stability constant of the complex at ionic strengths, I, of 0.10 (log Kr = 4.70), 0.20 (log Kr=4.51), 0.50 (log Kr = 4.24) and 0 (log K 0 = 5.05) and thermodynamic parameters were calculated using the data obtained by pH-metric measurements at 25.0?0.1?C (DH = 10.5 kJ mol-1, DG = -29.0 kJ mol-1, DS = 133 J mol-1 K-1).
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40

Lutoshkin, Maxim A., Boris N. Kuznetsov, and Vladimir A. Levdanskiy. "The interaction of morin and morin-5’-sulfonic acid with lead(II): Study of the 1:1 complex formation process in aqueous solution." Main Group Metal Chemistry 42, no. 1 (2019): 67–72. http://dx.doi.org/10.1515/mgmc-2019-0007.

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Abstract This article focuses on the aqueous complexation between two flavonoids (morin and morinsulfonate) and Pb2+ at constant ionic strength I=0.5 M (NaClO4). The determination of stability constants of ML complexes were performed at wide pH range. Two obtained constants are 14.8 ± 0.1 and 15.2 ± 0.1 logarithmic units for morin and morin-5’-sulfonic acid, respectively. For estimating the thermodynamic stability of the complexes studied, the Def2-SV(P)/DFT/PBE0/SMD method has been used. Different computational models were tested to describe the data obtained. The theoretical values of logK r
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41

Sonone, R. S., and G. H. Murhekar. "Formation constants of lanthanide metal ion chelates with some substituted sulfonic acids." Material Science Research India 7, no. 1 (2010): 235–38. http://dx.doi.org/10.13005/msri/070131.

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The pKa and logK values of some substituted sulfonic acid in 70% (v/v) dioxane-water mixture have been determined using pH metric measurements. The stability constant of complexes of Gd (III), Tb (III) and Ho (III) with p-aminobenzenesulfonic (L1) and p-sulfophthalic acid (L2), 2-amino-5-chloro benzenesulfonic acid (L3) and trifluoromethanesulfonic acid (L4) have been determined at 0.1M ionic strength at 28±0.1 0C pH metrically. It is observed that both the metal ions formed 1:1 & 1:2 complexes with all the ligands.
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42

Yu, Wookyung, Michael C. Baxa, Isabelle Gagnon, Karl F. Freed, and Tobin R. Sosnick. "Cooperative folding near the downhill limit determined with amino acid resolution by hydrogen exchange." Proceedings of the National Academy of Sciences 113, no. 17 (2016): 4747–52. http://dx.doi.org/10.1073/pnas.1522500113.

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The relationship between folding cooperativity and downhill, or barrier-free, folding of proteins under highly stabilizing conditions remains an unresolved topic, especially for proteins such as λ-repressor that fold on the microsecond timescale. Under aqueous conditions where downhill folding is most likely to occur, we measure the stability of multiple H bonds, using hydrogen exchange (HX) in a λYA variant that is suggested to be an incipient downhill folder having an extrapolated folding rate constant of 2 × 105 s−1 and a stability of 7.4 kcal·mol−1 at 298 K. At least one H bond on each of
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43

Jung, Jong Tae, Jong Oh Kim, Bum Gun Kwon, and Dong Ha Song. "Removal of Refractory Organic Compounds Using Peroxy Radical and Ozone Reaction in Aqueous Solution." Materials Science Forum 569 (January 2008): 33–36. http://dx.doi.org/10.4028/www.scientific.net/msf.569.33.

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This study was conducted to evaluate the treatment performance of the system using peroxy radical/ozone reaction for refractory organic compounds removal in aqueous solution. The effect of initial humic acid concentration was conducted under the conditions of humic acid concentration 10 mg/L, 30 mg/L, 50 mg/L and 100 mg/L. Reaction rate constant (k) in 30 mg/L of humic acid concentration was higher than that of humic acid concentration 10 mg/L, 50 mg/L amd 100 mg/L. However, it decreased over the range of 30 mg/L of humic acid concentration due to the action of internal filter of humic acid it
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44

Ran, Jian Hua, Irina Shushina, Viktoriia Priazhnikova, and Felix Telegin. "Inhibition of Mordant Dyes Destruction in Fenton Reaction." Advanced Materials Research 821-822 (September 2013): 493–96. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.493.

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Kinetics of destruction of acid and mordant dyes in Fenton reaction was investigated by the use of spectral method. Inhibition of destruction of some mordant dyes was observed. A simple theory for describing this phenomenon was proposed, which is based on consideration of participation of iron ions in complex formation with mordant dye ligands. By the use of chemical software JChem (ChemAxon) it was found that mordant dye exhibiting stability in Fenton solution bears hydroxyl group with high dissociation constant, pK=2,57. On the contrary, another dye bearing hydroxyl with low dissociation con
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45

Moslavac, Tihomir, and Antun Jozinović. "Utjecaj mikrovalnog zagrijavanja i dodatka antioksidansa na održivost ekstra djevičanskog maslinovog ulja sorte Oblica." Glasnik zaštite bilja 41, no. 5 (2018): 96–103. http://dx.doi.org/10.31727/gzb.41.5.9.

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Virgin olive oil has a high resistance to oxidative deterioration due to both a triacylglycerol composition low in polyunsaturated fatty acids and a group of phenolic antioxidants composed mainly of polyphenols and tocopherols. This essay discusses the effect of microwave heating on the oxidative stability of extra virgin olive oil with or without the addition of antioxidants and synergists. Of natural antioxidants are used rosemary extract and green tea extract and citric acid synergist. Oil samples with or without the addition of antioxidants and synergists were heated in a microwave oven at
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46

Li, Ming Yu, Da Yong Yang, Qing Xuan Zeng, Wen Qing Wang, and Zhi Hao Li. "Structure and Characterization of Strong Acid Cationic Exchange Fiber." Advanced Materials Research 1096 (April 2015): 194–98. http://dx.doi.org/10.4028/www.scientific.net/amr.1096.194.

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A novel polypropylene strong acid cationic exchange fiber (SACEF) was prepared by sulphonation reaction of polypropylene graft styrene (PP-g-St) fiber. The structure of SACEF was characterized through IR, TG, DTG, EA and SEM testing. The physicochemical properties of PSACEF, including adsorption capacity, adsorption dynamics, water content, and regeneration stability were evaluated. The results showed that the adsorption capacity of SACEF was 4.42 mmol·g-1. Infrared spectra indicated that hydrogen on the benzene ring was substituted by sulfuric acid group. TG and DTG confirmed that SACEF was m
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47

Ma, Mingbo, Pirah Ayaz, Wanhui Jin, and Wenlong Zhou. "Improving the Color Stability of Naturally Colored Silk by Cross-Linking the Sericin with Phytic Acid." International Journal of Polymer Science 2019 (April 15, 2019): 1–7. http://dx.doi.org/10.1155/2019/6936437.

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The color of naturally colored silk (NCS) fades easily during home washing due to the loss of pigment accompanied by dissolution of the sericin. In this study, phytic acid was used to cross-link the sericin of NCS and reduce its solubility, aiming at improving the color fastness of NCS to repeated washing. It was found that the sericin-fixing effect increased as the concentration of phytic acid to 1.0 wt% and the cross-linking time to 5 h increased and then reached a constant level. Cross-linking at pH 7.0-8.5 and temperature 30-40°C could obtain relatively good sericin-fixing effects. The cro
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48

KUMARESAN, P., S. MOORTHY BABU, and P. M. ANBARASAN. "THERMAL, DIELECTRIC STUDIES ON PURE AND AMINO ACID (L-GLUTAMIC ACID, L-HISTIDINE, L-VALINE) DOPED POTASSIUM DIHYDROGEN PHOSPHATE SINGLE CRYSTALS." Journal of Nonlinear Optical Physics & Materials 16, no. 02 (2007): 255–68. http://dx.doi.org/10.1142/s0218863507003676.

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Amino acids (L-Glutamic acid, L-Histidine, L-Valine) doped potassium dihydrogen phosphate crystals were grown by the solution growth technique. Slow cooling as well as slow evaporation methods were employed to grow these crystals. The concentration of dopants in the mother solution was varied from 0.1 mole % to 10 mole %. The solubility data for all dopant concentrations were determined. The variation in pH and the corresponding habit modification of the grown crystals were characterized with UV - VIS, FT-IR and SHG trace elements, and dielectric studies reveal slight distortion of lattice par
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49

Majó, Marc, Ricard Sánchez, Pol Barcelona, Jordi García, Ana Inés Fernández, and Camila Barreneche. "Degradation of Fatty Acid Phase-Change Materials (PCM): New Approach for Its Characterization." Molecules 26, no. 4 (2021): 982. http://dx.doi.org/10.3390/molecules26040982.

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The use of adequate thermal energy storage (TES) systems is an efficient way to achieve thermal comfort in buildings reducing the cooling and heating demand. Besides, deploy phase change materials (PCM) to meet and enhance the TES needs is highly effective and widely studied. In this paper, a study of the degradation of two fatty acids is presented, capric and myristic acids, in order to evaluate whether their thermo-physical properties are affected throughout time during service. This was carried out by means of two different types of thermal treatments: degradation at constant temperature (t
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50

Davies, K. J. A., A. Sevanian, S. F. Muakkassah-Kelly, and P. Hochstein. "Uric acid-iron ion complexes. A new aspect of the antioxidant functions of uric acid." Biochemical Journal 235, no. 3 (1986): 747–54. http://dx.doi.org/10.1042/bj2350747.

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In order to survive in an oxygen environment, aerobic organisms have developed numerous mechanisms to protect against oxygen radicals and singlet oxygen. One such mechanism, which appears to have attained particular significance during primate evolution, is the direct scavenging of oxygen radicals, singlet oxygen, oxo-haem oxidants and hydroperoxyl radicals by uric acid. In the present paper we demonstrate that another important ‘antioxidant’ property of uric acid is the ability to form stable co-ordination complexes with iron ions. Formation of urate-Fe3+ complexes dramatically inhibits Fe3+-
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