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Journal articles on the topic 'Has been confirmed by conductometric titration'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

MAHMOUD, A. GHANDOUR, MANSOUR HBSHAM, and KHODARY MAHMOUD. "Polarographic Behaviour of some Metal Ions in Presence of Pyruvate." Journal of Indian Chemical Society Vol. 66, Feb 1989 (1989): 76–80. https://doi.org/10.5281/zenodo.5939848.

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Chemistry Department, Faculty of Samos, Assiut University, Assiut, Egypt Chemistry Department, Faculty of Science, Assiut University, Qene, Egypt <em>Manuscript mewed 25 February 1988, revised 20 June 1988, accepted 12 October 1988</em> <strong>The polarographic reduction of BI<sup>III</sup>, Fe<sup>III</sup>, Hg<sup>II</sup>, Cu<sup>II</sup> and UO<sub>2</sub>II at the dropping mercury electrode has been investigated in pyruvate solution. A single-reduction wave has been observed with each metal Ion. It has been proved that pyruvate forms complexes of the type 1 :1 and 2 : 1 ligand to me

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2

Saltykova, M. S., Y. B. Elchishcheva, and L. G. Chekanova. "COMPLEX-FORMING PROPERTIES OF DIACYLHYDRAZINES OF NON-PENTANE ACID." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 9, no. 3 (2019): 219–26. http://dx.doi.org/10.17072/2223-1838-2019-3-219-226.

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The complexation processes of diacylhydrazines (DAH): dineopentanoylhydrazine (DNH) and 1-neopentanoyl-2-benzoylhydrazine (NBH) with Cu (II) ions in ammonia were studied. By saturation, shift of equilibria, intersection of curves, it was proved that in solutions these reagents with Cu (II) ions form complex compounds with ratios of 1: 1 and 1: 2. The results of the study were confirmed by conductometric titration. The conditions for the flotation extraction of Cu (II) ions by diacylhydrazines were studied: the pH of the solutions, the flotation time, the amount of reagent. The efficiency of th

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3

Azam, A. T. M. Z., F. Siraji, M. S. Amran, J. N. Islam, F. M. Amjad, and M. A. Hossain. "In vitro Interaction of Metronidazole and Mebendazole with Copper (II) and Chromium (III) in Aqueous Media." Journal of Scientific Research 4, no. 1 (2011): 173. http://dx.doi.org/10.3329/jsr.v4i1.7599.

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The interaction of metronidazole, an antiprotozoal agent and mebendazole, an important anthelmentic agent with Cu (II) and Cr(III) ions have been studied in aqueous systems at a fixed temperature of 37±0.5°C and at different pH values. It has been found that metronidazole and mebendazole form stable 1:1 complexes with Cu(II), but a less stable complex with Cr(III) ion. The studies were performed by electroanalytical and spectrophotometric methods. Spectral studies helped to detect initial complexation between the species. Conductometric titration indicated the nature of interaction and the sto

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4

MAHMOUD, A. GHANDOUR, MANSOUR HESHAM, and KHODARY MAHMOUD. "Polarographic Behaviour of some Metal Ions in Presence of Pyruvate." Journal of Indian Chemical Society Vol. 66, Feb 1989 (1988): 76–80. https://doi.org/10.5281/zenodo.6302415.

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Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt Chemistry Department, Faculty of Science, Assiut University, Qena, Egypt <em>Manuscript received 26 February 1986, revised 20 June 1988, accepted 12 October 1988</em> The polarographic reduction of Bi<sup>III</sup>, Fe<sup>llI</sup>, Hg<sup>ll</sup>, Cu<sup>ll</sup> and UO<sub>2</sub><sup>ll</sup> at the dropping mercury electrode has been investigated in pyruvate solution. A slngle-reduction wave has been obseved with each metal ion. It has been proved that pyruvate forms com- plexes of th

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5

Belsare, P. U., A. B. Zade, P. P. Kalbende, and M. S. Dhore. "Thermal Degradation Studies of Terpolymer Derived from 2-Aminothiophenol, Hexamethylenediamine, and Formaldehyde." Journal of Polymers 2014 (April 14, 2014): 1–9. http://dx.doi.org/10.1155/2014/350832.

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Terpolymer (2-ATPHMDAF-I) has been synthesized by the condensation of 2-aminothiophenol and hexamethylenediamine with formaldehyde in the presence of 2 M hydrochloric acid as a catalyst with 1 : 1 : 2 molar proportion of reacting monomers. The structure of newly synthesized terpolymer has been elucidated and confirmed on the basis of elemental analysis and various spectral techniques, that is, UV-visible, FT-IR, and 1H-NMR spectroscopy. Number average molecular weight (Mn¯) has been determined by conductometric titration in nonaqueous medium. The viscosity measurements in dimethyl sulfoxide (D

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6

Dhore, Mangesh S., Pawan P. Kalbende, and Suraj S. Butoliya. "Thermal Behaviour and Sorption Studies of Ion-Exchange Resin." Research Journal of Chemistry and Environment 27, no. 7 (2023): 11–22. http://dx.doi.org/10.25303/2707rjce011022.

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Copolymer resin 2,4-DAPOF-II has been synthesized by condensation polymerization and its composition was determined on the basis of elemental analysis. Non-aqueous conductometric titration was used to determine the average molecular weight and the intrinsic viscosity was also determined. The formation of copolymer resin was confirmed by FT-IR, 1H-NMR and 13C-NMR spectroscopy. The semi-crystalline nature of synthesized copolymer was established by Scanning electron microscopy (SEM). Thermal degradation curve has been discussed with minute details by applying Freeman-Carroll8, Sharp-Wentworth47,

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7

Khoma, R. E., T. S. Bienkovska, V. O. Gelmboldt, D. G. Klimov, and M. G. Horlichenko. "COMPOSITION AND THE RELATIVE STABILITY OF SULFUR DIOXIDE INTERACTION PRODUCTS WITH POTASSIUM AND MONOETHANOLAMMONIUM TAURATES AQUEOUS SOLUTIONS. PROLONGED-ACTION CHEMOSORBENT." Odesa National University Herald. Chemistry 28, no. 3(86) (2023): 35–52. http://dx.doi.org/10.18524/2304-0947.2023.3(86).297810.

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Much research attention has been paid to amino acids as an alternative to amino alcohols for capture of sulfur dioxide. Taurine (Tau) occupies a special place among amino acids. This study was stimulated by the limited literature data on the nature of the interaction of SO2 with Tau salts aqueous solutions, the composition and relative stability of the corresponding reaction products. Chrono-pH-, chrono-redox- and chrono-conductometric studies of SO2 chemisorption with potassium taurate (TauK) and monoethanolammonium (TauMEA) aqueous 0.1 M solutions were carried out in the temperature range 29

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8

Shestakova, D. O., N. N. San’kova, and E. V. Parkhomchuk. "Conductometric and Potentiometric Titration of Carboxyl Groups in Polymer Microspheres." Высокомолекулярные соединения А 65, no. 5 (2023): 391–404. http://dx.doi.org/10.31857/s2308112023600102.

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A laboratory procedure has been suggested for determining the concentration of carboxyl groups at the surface of polystyrene microspheres at the latex concentration of a few hundredths of weight percentage (the COOH groups concentration below 4 × 10−4 mol/L). The procedure is based on conductometric and potentiometric titration. The influence of polymer particles concentration in the system, ionic strength of the solution, titration duration, and the system inertness on the obtained values of the carboxyl groups concentration and the determination accuracy have been investigated.

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9

Umarov, U.A., O.Yu Maslov, S.V. Kolisnyk, and M. Fathullaeva. "Development And Validation Of The Conductometric Titration Method Of Quantitative Determination Of Free Organic Acids In The Anise Fruits." European Journal of Molecular & Clinical Medicine 7, no. 3 (2020): 3874–83. https://doi.org/10.5281/zenodo.10029586.

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A conductometric titration method has been developed for determination of free organic acids in anise fruits. The direct acid base titration of free organic acids was carried as a titrant was used the standardized sodium hydroxide aqueous solution. The end-point of titration was fixed by a conductometric electrode. The calibration curve was found to be linear in the concentration range of 0.0112-0.0332 mg/cm 3 (r 2 = 0.9992). The percentage recovery was found to be in the range of 98.61-101.25%. The intra-day and inter-day precision were 1.32% and 1.62%, respectively. The method was found to b

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10

Prasad, S., V. D. Leite, R. A. C. Santana, and E. A. Medeiros. "Electrometric studies on formation of cerium vanadates as a function of pH." Eclética Química 31, no. 2 (2006): 31–38. http://dx.doi.org/10.1590/s0100-46702006000200005.

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The precise nature of the reaction between nitric acid and sodium ortho-vanadate solutions has been studied by means of electrometric techniques involving potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves confirm the existence of the anions, pyro-V2O7(4-), meta-VO3- and poly-H2V10O28(4-) corresponding to the ratios of VO4(3-):H+ as 1:1, 1:2 and 1:2.6 in the neighborhood of pH 10.5, 7.4 and 3.6, respectively. The interaction of cerium(III) nitrate with sodium vanadate solutions, at specific pH levels 12.4, 10.5, 7.4 and 3.6 was also st

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11

Aloke, Chattopadhyay. "Studies on polyvalent metal ion bound guargum-graft-acrylamide to explore nature of ion binding." Journal of Indian Chemical Society Vol. 89, Jun 2012 (2012): 783–88. https://doi.org/10.5281/zenodo.5763773.

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Department of Chemistry, S. B. College, Bagati, Mogra, Hooghly-712 148, West Bengal, India E-mail : aloke.chattopadhyay09@gmail.com Manuscript received 07 July 2011, revised 24 October 2011, accepted 25 October 2011 Guargum-graft-acrylamide has been found to be a flocculent for metallic ions. From guargum-graft-acrylamide three new materials : yttrium ion bound guargum-graft-acrylamide, barium ion bound guargum-graft-acrylamide and cupric ion bound guargum-graft-acrylamide have been synthesized. To understand nature of ion binding, pH titration, conductometric titration, transmission electron

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12

H., S. Rathore, and Kumar M. "A new precipitation-conductometric titration technique for heavy metal ions in water." Journal of Indian Chemical Society Vol. 83, Jul 2006 (2006): 733–34. https://doi.org/10.5281/zenodo.5825341.

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Applied Chemistry Department, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, India E-mail : hsrathore@mailcity.com3 Manuscript received 25 October 2005, revised 20 April 2006, accepted 20 April 2006 A new precipitation-conductometric titration technique has been developed for the determination of Zn<sup>II</sup>, Pb<sup>II</sup>, Hg<sup>II</sup>, Hg<sup>I</sup>, Cd<sup>II</sup>, Co<sup>II</sup>, Cu<sup>II</sup>, Nl<sup>II</sup>, Fe<sup>II</sup> and Fe<sup>III</sup> in coloured solutions. Solution of sodium diethyldithiocarbamate (Na

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13

Jado, Demelash, Khalid Siraj, and Nathan Meka. "Electron Donor-Acceptor Interaction of 8-Hydroxyquinoline with Citric Acid in Different Solvents: Spectroscopic Studies." Journal of Applied Chemistry 2014 (August 17, 2014): 1–7. http://dx.doi.org/10.1155/2014/484361.

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Charge transfer complex formation between 8-hydroxyquinoline as the electron donor and citric acid as the electron acceptor has been studied spectrophotometrically in ethanol and methanol solvents at room temperature. Absorption band due to charge transfer complex formation was observed near 320 and 325 nm in ethanol and methanol, respectively. The stoichiometric ratio of the complex has been found 3 : 1 by using Job’s and conductometric titration methods. Benesi-Hildebrand equation has been applied to estimate the formation constant and molecular extinction coefficient. It was found that the

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14

Prasad, S., R. A. C. Santana, A. R. N. Campos, and V. D. Leite. "Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates." Eclética Química 32, no. 1 (2007): 71–78. http://dx.doi.org/10.1590/s0100-46702007000100010.

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The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate (< 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric and conductometric titrations. The well defined inflections and breaks in the titration curves provide evidence for the existence of the polyanions, para-W12O41(10-) and meta-W12O39(6-) corresponding to the ratio of H+:WO4(2-) as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction of lanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was also s

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15

Patel, K. D., M. M. Morekar, and Y. S. Tilak. "Synthesis, Characterization and Glass - Reinforced Composites of N,N'-Dimethylolthiourea – m-Aminophenol Resin." E-Journal of Chemistry 2, no. 2 (2005): 136–41. http://dx.doi.org/10.1155/2005/598974.

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N,N’-Dimethylolthiourea (DMTU) resin having the methylol group ( –CH2OH ) has been prepared and characterized. The condensation of DMTU resin with m-aminophenol was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTU: mAP, namely 1:1, 1:1.5 and 1:2. The resultant DMTUmAP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of DMTUmAP resin with hexamethylenetetramine (HMTA) was monitored by differential scanning calorimetr

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16

Patel, Hasmukh S., and Bharat C. Dixit. "Synthesis, Characterization and Glass-Reinforced Composites of Acetone–Formaldehyde–Phenol Resins." High Performance Polymers 9, no. 2 (1997): 153–60. http://dx.doi.org/10.1088/0954-0083/9/2/007.

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Acetone–formaldehyde (AF) resin having the methylol group (–CH2OH) has been prepared and characterized. The condensation of AF resin with phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of AF:P, namely 1:1, 1:1.5 and 1:2. The resultant AFP resins were characterized by elemental analysis, IR spectral studies, number average molecular weight ( Mn) estimated by non-aqueous conductometric titration, and thermogravimetry. The curing study of AFP resins with hexamethylene tetramine (HMTA) was monitored by differential scanning calorimetry (DSC) and kinetic p

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17

Patel, Kanuprasad Dahyalal, Dhirubhai J. Desai, Manish M. Morekar, and Yogesh Shrikant Tilak. "Synthesis, Characterization and Glass - Reinforced Composites of Thiourea - Formaldehyde - Phenol Resin." E-Journal of Chemistry 1, no. 5 (2004): 256–62. http://dx.doi.org/10.1155/2004/569824.

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N,N'-Dimethylol thiourea-formaldehyde (DMTUF) resin having the methylol group (CH2OH) has been prepared and characterized. The condensation of DMTUF resin with Phenol (P) was carried out in the presence of alcoholic alkali catalyst at varying ratios of DMTUF: P, namely 1:1, 1:1.5 and 1:2. The resultant DMTUFP resin was characterized by elemental analysis, IR spectral studies, number average molecular weight (M¯n) estimated by non-aqueous conductometric titration, and thermo gravimetry. The curing study of DMTUFP resin with hexamethylene tetramine (HMTA) was monitored by differential scanning c

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18

Oliveira Rossini, Pamela, Fabiana Felix, and Lúcio Angnes. "A simple and precise conductometric method for the determination of losartan in pharmaceutical products." Open Chemistry 10, no. 6 (2012): 1842–49. http://dx.doi.org/10.2478/s11532-012-0110-6.

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AbstractLosartan is an antihypertensive agent that lost its patent protection in 2010, and, consequently, it has been available in generic form. The latter motivated the search for a rapid and precise alternative method. Here, a simple conductometric titration in aqueous medium is described for the losartan analysis in pharmaceutical formulations. The first step of the titration occurs with the protonation of losartan producing a white precipitate and resulting in a slow increase in conductivity. When the protonation stage is complete, a sharp increase in conductivity occurs which was determin

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19

S. Butoliya, S., W. B. Gurnule, and A. B. Zade. "Study of Non-Isothermal Decomposition and Kinetic Analysis of 2,4-Dihydroxybenzoic Acid- Melamine-Formaldehyde Copolymer." E-Journal of Chemistry 7, no. 3 (2010): 1101–7. http://dx.doi.org/10.1155/2010/425626.

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A copolymer (2,4-DHBAMF) synthesized by the condensation of 2,4-dihydroxybenzoic acid and melamine with formaldehyde in the presence of acid catalyst using varied molar proportions of the reactants. A composition of the copolymer has been determined by elemental analysis. The number average molecular weight has been determined by conductometric titration in non-aqueous medium. The copolymer has been characterized by UV-Visible, IR and1H NMR spectral analysis. Thermogravimetric analysis was carried out to study the decomposition and various kinetic parameters. Freeman Carroll and Sharp Wentwort

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20

Patel, Hasmukh S., and Vipul J. Shah. "Epoxy-modified polyimides: part I." High Performance Polymers 5, no. 2 (1993): 145–53. http://dx.doi.org/10.1088/0954-0083/5/2/006.

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The Michael addition reaction of N,N'-l,4-phenylene bis(maleimide) (PBM) with 4,4'-diamino diphenyl methane (DDM) at 1:1, 1: 1.5 and 1:2 molar ratios was carried out in melt at 125-130'C. The resultant polyimide oligomers (PBM-DDM) were characterized by elemental analysis, number of amino and imino groups, IR spectral studies, number average molecular weight, by non-aqueous conductometric titration, and thermogravimetry. These polyimide oligomers were used to cure epoxy resin, namely diglycidyl ether of bisphenol-A, and studied by differential scanning calorimetry (DSC). The unreinforced PBM-D

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21

J., C. GHOSH, and BHUSAN BISWAS ANIL. "PHYSICO-CHEMICAL STUDIES OF COMPLEX ACID. PART II. CONDUCTOMETRIC AND GLASS ELECTRODE TITRATION OF MOLYBDIO ACID SOL." Journal of Indian Chemical Society Vol. 22, Jan-Dec 1945 (2022): 295–300. https://doi.org/10.5281/zenodo.6592854.

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Molybdic acid sol, prepared by the action of dilute hydrochloric acid on ammonium molybdate solution, when dialysed free from Cl’ ion, has a composition of the solute corresponding to NH<sub>4</sub>H- [O(MoO<sub>3</sub>)<sub>4</sub>]. The id on dilution from 3.30 x 10<sup>-2</sup> <em>M</em>-MoCO<sub>3</sub> to 1.65 x 10<sup>-4</sup> if-MoO<sub>3</sub> gave continually increasing value of <em>p</em>H. In the region of <em>p</em>H 3.8 to 4.5, the curve wee rather fiat and this has been ascribed to the disintegration of colloidal micelle of molybdic said to true solution containi

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22

Krishan, Bal, Md Tawkir Md. Tawkir, and Nidhi Sharma. "Synthesis, FTIR, NMR, Mass spectral, X-ray crystallographic and Thermal Studies of Hg(II) Complex of N, N-dimethylbiguanide." Oriental Journal Of Chemistry 38, no. 2 (2022): 419–26. http://dx.doi.org/10.13005/ojc/380225.

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Metal chelate of antidiabetic drug is synthesized and characterized by using various spectroscopic tools like elemental analyses, IR, NMR, mass spectra, thermal analyses (TGA) and X-ray powder diffraction techniques. The nonvariation conductometric titration method indicated the ionic nature of the complex and LM2 structure type. Complex was assigned tetrahedral geometry based on the spectral data and was found to have chemical formula [(C4H10N5)(HgCl)2] (Scheme-I). Crystallographic parameters have been calculated from powder X-ray diffraction analysis. The thermal and kinetic behaviour of the

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23

Bratty, Mohammed Al, Hatim Murayzin, Adel Almanaa, et al. "Quantitative Conductometric Determination of Sitagliptin, Linagliptin, Vildagliptin and Alogliptin by Applying the Concept of Drug-Metal Ion Interaction." Oriental Journal Of Chemistry 35, no. 5 (2019): 1597–604. http://dx.doi.org/10.13005/ojc/350518.

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Cost of analysis and length of analytical procedure are among the most concerning factors in drug analysis. As conductometric analysis has been considered to be relatively inexpensive analytical technique offering fast analysis of drugs, in this study our aim was to develop a rapid and cost-effective method for quantitative determination of sitagliptin, linagliptin, vildagliptin and alogliptin in bulk and dosage forms. The test drugs were allowed to complex with metal ion (Cu2+) in the titration cell, which resulted in the change of conductance of the solution. The corrected conductance was ca

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24

Khateeb, Mouhammed. "Use of sodium tetraphenylborate reagent for conductometric titration of Amlodipine Besylate in pure and pharmaceutical forms." International Journal of Chemistry, Mathematics and Physics 7, no. 4 (2023): 19–24. http://dx.doi.org/10.22161/ijcmp.7.4.4.

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Simple, accurate and reliable conductometric method for the quantitative determination of Amlodipine Besylate (AML) in pure form and pharmaceutical formulations using sodium tetraphenylborate (TPB) in aqueous solution at 20°C has been described. The method is based on the formation of ion association complex of cation coming from the cited drug with tetraphenylborate anion and the conductance of the solution is measured as a function of the volume of titrant. Many experimental conditions were evaluated. The described procedure allowed the determination of AML in double distilled water in the r

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25

Khateeb, Mouhammed. "Use of sodium tetraphenylborate reagent for conductometric titration of Amlodipine Besylate in pure and pharmaceutical forms." International Journal of Chemistry, Mathematics and Physics 7, no. 4 (2023): 19–24. http://dx.doi.org/10.22161/ijcmp.7.4.5.

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Simple, accurate and reliable conductometric method for the quantitative determination of Amlodipine Besylate (AML) in pure form and pharmaceutical formulations using sodium tetraphenylborate (TPB) in aqueous solution at 20°C has been described. The method is based on the formation of ion association complex of cation coming from the cited drug with tetraphenylborate anion and the conductance of the solution is measured as a function of the volume of titrant. Many experimental conditions were evaluated. The described procedure allowed the determination of AML in double distilled water in the r

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26

Y., M. ISSA, and H. HEGAZY W. "Formation Constants of some J-Acid Azo Dyes Metal Chelates." Journal of Indian Chemical Society Vol. 74, Jul 1997 (1997): 542–44. https://doi.org/10.5281/zenodo.5901564.

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Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt Inorganic Chemistry Department, National Research Center, Dokki, Egypt <em>Manuscript received 13 December 1995, revised 4 June 1996, accepted 20 June 1996</em> The formation constants of trivalent Sc, Y, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Yb and divalent UO<sub>2</sub> ion chelates with some J-acid azo dyes have been determined pH-metrically using the Calvin-Bjerrum titration technique as modified by Irving and Rossotti. The dissociation constants of the ligands and stability constants of the metal chelates have been det

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27

Ageev, Igor M., and Yuri M. Rybin. "Measuring complex for monitoring carbon dioxide in air." Izmeritel`naya Tekhnika, no. 4 (2021): 68–71. http://dx.doi.org/10.32446/0368-1025it.2021-4-68-71.

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The advantages and disadvantages of infrared and electrochemical gas analyzers for carbon dioxide CO2 are described. The possibility of using conductometric sensors with distilled water for monitoring the CO2 content in the air has been investigated. Two identical measuring systems were manufactured, each containing two open-type conductometric cells, a matching device and a personal computer. With the help of these complexes, experiments were carried out on the simultaneous measurement of the CO2 content in the air in two places (a laboratory room and a building in a forest, located at a dist

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28

Prasad, Saradh, Renato Alexandre Costa De Santana, Ana Regina Nascimento Campos, and Valderi Duarte Leite. "Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates." Ecletica Quimica 32, no. 1 (2007): 71–78. http://dx.doi.org/10.26850/1678-4618eqj.v32.1.2007.p71-78.

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The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate(≤ 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric andconductometric titrations. The well defined inflections and breaks in the titration curves provideevidence for the existence of the polyanions, para-W 12 O 4110- and meta-W 12 O 396- corresponding to theratio of H + :WO 42- as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction oflanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was alsostudied

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29

Anita, Singh, S. Tripathi V., and C. Chattopadhyaya M. "Atomic absorption spectrophotometric determination of tryptophan and cysteine." Journal of Indian Chemical Society Vol. 85, June 2008 (2008): 635–37. https://doi.org/10.5281/zenodo.5816821.

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Electrochemical Sensors Lab, Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : mcc46@rediffmail.com, anita.singh.01@gmail.com <em>Manuscript received 16 October 2007, revised 1 April 2008, accepted 3 April 2008</em> A novel method for determination of cysteine and tryptophan using atomic absorption spectrophotometry has been developed in which these substances are allowed to react with methanol solution of iodine there by iodide ions are released quantitatively and the released iodide ions are allowed to react with excess amount of silver nitrat

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30

Modi, Krunal, Urvi Panchal, Chirag Patel, et al. "Dual in vitro and in silico analysis of thiacalix[4]arene dinaphthalene sulfonate for the sensing of 4-nitrotoluene and 2,3-dinitrotoluene." New Journal of Chemistry 42, no. 4 (2018): 2682–91. http://dx.doi.org/10.1039/c7nj03820h.

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A newly synthesized thiacalix[4]arene dinaphthalene sulfonate, i.e., TCDNS, has been used as a fluorescence quencher for 2,3-DNT as well as 4-NT. The complex was analyzed by ESI-MS and <sup>1</sup>H-NMR titration, which has been further confirmed by the in silico study.

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31

Chouhan, Om, and Hansa Chouhan. "X-ray Diffraction and Thermal Characterization Study of SmIII Complex of Sulphonylurea, Glipizide: An Oral Antidiabetic Drug." Material Science Research India 11, no. 1 (2014): 75–81. http://dx.doi.org/10.13005/msri/110110.

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The present paper deals with the study of sulphonylurea glipizide (GLP) drug in order to give a thought concerning its coordinating potentiality towards some inner transition metals. Metal complex of GLP drug issynthesized and characterized by using analytical data, molar conductance, X-ray diffraction and thermogravimetric analysis (TGA and DTA) studies. From the analytical data, the complex is proposed to have general formula(C21H26N5O4S)2Sm(OH2)4.Low values of molar conductance indicate that complex have non ionic nature. The conductometric titration using monovariation method reveal that c

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Elchishcheva, Yulia B., Aleksandra S. Sorokina, and Petr T. Pavlov. "Study of reaction of Cu(II) ions with N-(benzoyl)-N'-(phenylsulfonil)hydrazine in ammonia medium by the spectrophotometric method." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 13, no. 3 (2023): 150–59. http://dx.doi.org/10.17072/2223-1838-2023-3-150-159.

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The reaction of complexation of N-(benzoyl)-N'-(phenylsulfonyl)hydrazine with Cu(II) ions in an ammonia medium has been studied. The absorption spectra of the reagent and its complex with Cu(II) ions have been recorded and analyzed. The optimal conditions for the formation of the complex compound were found: the pH range of complex formation; optimal time for color development; amount of photometric reagent. Under optimal conditions for the complex formation of BPSH with Cu(II) ions, a calibration graph was constructed. The Bouguer-Lambert-Beer law is fulfilled in the range from 0,5 to 1,75 mg

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Gurnule, W. B., P. G. Gupta, R. H. Gupta, Y. U. Rathod, and N. B. Singh. "Thermal degradation studies of 2-amino 6-nitrobenzothiazole-oxamide-formaldehyde copolymer and its composites." IOP Conference Series: Earth and Environmental Science 1281, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1755-1315/1281/1/012026.

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Abstract Composites are viewed as promising advanced materials because of their superior features, including enhanced flame retardancy, density, relatively large surface areas, strength and thermomechanical/optoelectronic/magnetic capabilities. 2-amino 6-nitrobenzothiazole, oxamide, and formaldehyde has been used for the synthesis of copolymerizing polycondensation technique, and newly synthesized copolymer with activated charcoal was used to synthesize its composite. Several physicochemical techniques, and Ultraviolet-visible, SEM, TGA, and FTIR techniques, have been utilized to illustrate th

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Pangannaya, Srikala, Neethu Padinchare Purayil, Shweta Dabhi, et al. "Spectral and DFT studies of anion bound organic receptors: Time dependent studies and logic gate applications." Beilstein Journal of Organic Chemistry 13 (February 6, 2017): 222–38. http://dx.doi.org/10.3762/bjoc.13.25.

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New colorimetric receptors R1 and R2 with varied positional substitution of a cyano and nitro signaling unit having a hydroxy functionality as the hydrogen bond donor site have been designed, synthesized and characterized by FTIR, 1H NMR spectroscopy and mass spectrometry. The receptors R1 and R2 exhibit prominent visual response for F− and AcO– ions allowing the real time analysis of these ions in aqueous media. The formation of the receptor–anion complexes has been supported by UV–vis titration studies and confirmed through binding constant calculations. The anion binding process follows a f

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Elchishcheva, Yulia B., Ksenia S. Gorbunova, and Petr T. Pavlov. "Development of a spectrophotometric method for determination of ions Cu (II) C N- (2-hydroxybenzoyl) -N '- (p-tosil)hydrazine in ammonia media." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 11, no. 2 (2021): 103–13. http://dx.doi.org/10.17072/2223-1838-2021-2-103-113.

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A spectrophotometric method for the determination of Cu (II) ions with N- (2-hydroxybenzoyl) -N '- (p-tosyl) hydrazine (GBSH) in ammonia media has been developed. The optimal conditions for the formation of a complex compound are found: the wavelength of maximum light absorption; pH complexation; optimal time for color development; the amount of photometric reagent. Under optimal conditions of complexation of GBSG with Cu (Ⅱ) ions (λ = 401 nm, pH = 9.2, τ = 30 minutes, VGBSG = 3.75 ml), a calibration graph is constructed. The Bouguer-Lambert-Beer law is fulfilled in the range from 0.13 to 1.59

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Yarmamedova, S. E., F. E. Huseynov, E. J. Eyyubova, Kh J. Nagiev, and F. M. Chyragov. "STUDY OF THE COMPLEX FORMATION OF SAMARIUM(III) WITH 3-(2-HYDROXY-3-SULPHO-5-(NITROPHENYLHYDRAZO) PENTANE-2,4-DIONE IN THE PRESENCE OF SURFACTANTS." Azerbaijan Chemical Journal, no. 1 (March 28, 2023): 169–75. http://dx.doi.org/10.32737/0005-2531-2023-1-169-175.

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This article presents the results of a study of the complex formation of samarium(III) with 3-(2-hydroxy-3-sulpho-5-(nitrophenylhydrazo)pentan-2,4-dione (R) in the presence and absence of surfactants: cetylpyridinium chloride (СPСl), cetylpyridinium bromide (СPBr), cetyltrimethylammonium bromide (CTMABr). The ratio of the reacting components in the composition of the same- (1:2) and mixed-ligand (1:2:2) compounds was established. The range of compliance with Beer's law was determined. The specific electrical conductivity of the studied complexes was studied by the method of conductometric titr

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Shimolin, A. Yu. "Caffeine Quantification Via High-Precision Coulometric Titration." Measurement Standards. Reference Materials 19, no. 4 (2023): 115–27. http://dx.doi.org/10.20915/2077-1177-2023-19-4-115-127.

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Caffeine has traditionally been used to assess and control the metrological characteristics of liquid chromatographs. In recent years, with increasing requirements for the traceability of measurement results, the use of caffeine as a reagent for verification, calibration, and type approval tests has started to contradict the effective regulations governing measurement uniformity. This study aims to develop and test a procedure of caffeine quantification in caffeine via primary coulometric titration for the metrological support of high-performance liquid chromatography (HPLC) with an accuracy o

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Svietkina, Olena, Iryna Kovalevska, Kateryna Sai, and Kostiantyn Prokopenko. "Intensifying the process of methane gas hydrates crystallization in the presence of surface-activated substances." E3S Web of Conferences 230 (2021): 01004. http://dx.doi.org/10.1051/e3sconf/202123001004.

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The crystallization process of gas hydrates during their formation in the presence of surface-active substances (SAS) is studied. The research is conducted in two directions – theoretical and experimental. Experimental data on the crystallization rate of methane gas hydrates formation in the presence of surfactants have been obtained: high-molecular compounds are used on the basis of polymeric quaternary ammonium salts containing side aliphatic radicals of various lengths in the acyl fragment, as well as a number of specific surfactants. The process of methane gas hydrates formation is perform

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Kotsov, S. Yu, A. O. Badulina, E. A. Trufanova, et al. "Stability of Ionogels upon Contact with Water: Effect of Polymer Matrix Hydrophobicity and Ionic Liquid Solubility." Kolloidnyj žurnal 86, no. 5 (2024): 579–94. https://doi.org/10.31857/s0023291224050063.

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New composite materials (ionogels) have been obtained based on imidazolium ionic liquids immobilized in highly porous polymers, i.e., polyamide 6,6 (nylon 6,6) and low-density polyethylene. A method has been proposed for determining the rate of ionic liquid removal from an ionogel upon contact with water, with this method being based on continuous measuring the conductivity of an aqueous phase. The results of the conductometric measurements have been confirmed by high-performance liquid chromatography data. It has been shown that the stability of ionogels upon contact with water is determined

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Magina, Sandra, Ana Barros-Timmons, and Dmitry V. Evtuguin. "Laccase-catalyzed oxidative modification of lignosulfonates from acidic sulfite pulping of eucalyptus wood." Holzforschung 74, no. 6 (2020): 589–96. http://dx.doi.org/10.1515/hf-2019-0272.

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AbstractLignosulfonates (LS) from acidic magnesium-based sulfite cooking of Eucalyptus globulus wood were modified via laccase-catalyzed oxidative treatment with the aim to improve their performance as plasticizing additives in concrete formulations. The target parameters were the increment of molecular weight (Mw) and the amount of oxidized groups. The laccase-assisted oxidation under optimized conditions (40°C, pH 4.5, enzyme loads of 83–500 U g−1 for 90 min) allowed Mw increment up to 11-fold and almost doubled the amount of carbonyl and carboxyl groups without using any mediators. Modified

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T., SAROJINI, and RAMACHANDRAIAH A. "Polydentate Carboxyamide Ligands as Analytical Reagents." Journal of Indian Chemical Society Vol. 70, Feb 1993 (1993): 138–41. https://doi.org/10.5281/zenodo.5910766.

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Department of Chemistry, Regional Engineering College, Warangal-506 004 <em>Manuscript received 26 May 1992, revised 11 November 1992, accepted 24 November 1992</em> Biphenyl bridged, binucleating and polydentate macromolecular ligand series, H<sub>2</sub>L, possessing two terminal -NH-CO-A- COOH, carboxyamide moieties (where A=-CH<sub>2</sub>-CH<sub>2</sub>-or -CH = CH- or <em>ortho</em>-phenylene linkage), has been synthesised and was found to be a set of potential analytical reagents as H<sub>2</sub>L suspensions for conductometric and pH-metric aqueous acid-base titrations on one band

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Moumen, Abderrahim, Navpreet Kaur, Nicola Poli, Dario Zappa, and Elisabetta Comini. "One Dimensional ZnO Nanostructures: Growth and Chemical Sensing Performances." Nanomaterials 10, no. 10 (2020): 1940. http://dx.doi.org/10.3390/nano10101940.

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Recently, one-dimensional (1D) nanostructures have attracted the scientific community attention as sensitive materials for conductometric chemical sensors. However, finding facile and low-cost techniques for their production, controlling the morphology and the aspect ratio of these nanostructures is still challenging. In this study, we report the vapor-liquid-solid (VLS) synthesis of one dimensional (1D) zinc oxide (ZnO) nanorods (NRs) and nanowires (NWs) by using different metal catalysts and their impact on the performances of conductometric chemical sensors. In VLS mechanism, catalysts are

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Kong, Sifang, Jiang Cheng, Yangsheng Liu, Xiufang Wen, Pihui Pi, and Zhuoru Yang. "Synthesis of functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres by a novel suspension polymerization." Open Chemistry 6, no. 4 (2008): 627–33. http://dx.doi.org/10.2478/s11532-008-0055-y.

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AbstractIn this study, a novel and effective suspension polymerization has been employed to prepare functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres in the presence of bilayer surfactants (sodium dodecyl benzene sulfonate (SDBS) and oleic acid (OA)) coated on micro-size magnetic SrFe12O19. This was achieved by pre-polymerizing the organic phase, which contained co-monomers, porogens and treated magnetic particles, at 65°C for 0.5 h under ultrasound conditions. Aqueous solutions containing a dispersion agent were then added to effect suspension polymerization. Scanning electron m

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Tarigan, Daniel, Magdaleni Rahayu Agustina, and Soerja Kosenarpadi. "SINTESIS SURFAKTAN TURUNAN AMIDA YANG DIPEROLEH DARI REKASI METIL RISINOLEAT DAN ETILENDIAMINA." JURNAL KIMIA MULAWARMAN 15, no. 2 (2018): 94. http://dx.doi.org/10.30872/jkm.v15i2.609.

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Interesterification of castor oil with methanol using base catalyst gave mixture of fatty acid methyl esther (FAME) castor oil. Methyl risinoleate as major composition of methyl esther castor oil was subjected to column chromatography using petroleum ether:diethyl ether (19:1, v/v) as eluent, to give yield 73%. Amidation of methyl risinoleate with ethylendiamine under refluks condition using benzene as solvent for ± 12 hours and catalyst NaOCH3, gave 1,3–Dirisinoleil-Etilendiamida compound and 59% yield. The reactioned product 1,3–Dirisinoleil-Etilendiamida has been confirmed its structure usi

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Sonar, A. N., and N. S. Pawar. "Spectrophotometric and pH-Metric Studies of Ce(III), Dy(III), Gd(III),Yb(III) and Pr(III) Metal Complexes with Rifampicin." E-Journal of Chemistry 8, no. 2 (2011): 517–22. http://dx.doi.org/10.1155/2011/848906.

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The metal-ligand and proton-ligand stability constant of Ce(III), Dy(III), Gd(III),Yb(III) and Pr(III) metals with substituted heterocyclic drug (Rifampicin) were determined at various ionic strength by pH metric titration. NaClO4was used to maintain ionic strength of solution. The results obtained were extrapolated to the zero ionic strength using an equation with one individual parameter. The thermodynamic stability constant of the complexes were also calculated. The formation of complexes has been studied by Job’s method. The results obtained were of stability constants by pH metric method

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Newton, C., and W. T. W. Potts. "Ionic regulation and buoyancy in some planktonic organisms." Journal of the Marine Biological Association of the United Kingdom 73, no. 1 (1993): 15–23. http://dx.doi.org/10.1017/s0025315400032628.

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Magnesium/chlorine and sulphur/chlorine ratios have been measured in the body fluids of some planktonic organisms by x-ray emission analysis of frozen hydrated specimens in a scanning electron microscope. Homarus vulgaris (Anthropoda: Decapoda) larvae excluded Mg2+ and SO42-ions from the haemolymph, but to a lesser extent than does the adult lobster. Bipinnaria larvae of Asterias (Echinodermata) excluded Mg2+ and SO42-ions from the coelomic fluid. Obelia medusae excluded Mg2+ and SO42-ions from the mesogloea but concentrate them in the gastrovascular system. The high concentration of sulphate

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Yousefi, Neptun, Benjamin Wilson, and Eero Kontturi. "Electromediated Oxidation of Hydrolysed Bacterial Cellulose." ECS Meeting Abstracts MA2023-02, no. 27 (2023): 1432. http://dx.doi.org/10.1149/ma2023-02271432mtgabs.

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The state-of-the-art method to isolate cellulose nanofibres employs a 2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO)/NaBr/NaClO system, where the primary alcohols on the surface of cellulose microfibrils are oxidised. However, the large consumption of hypochlorite in this system makes it problematic for industrial implementation. Previously, electrochemical oxidation with a TEMPO catalyst has been reported for the preparation of cellulose nanofibres. Here, we present a study on the electromediated oxidation of bacterial cellulose (BC), the purest form of cellulose. BC has been used in a hydrolysed

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Frišták, Vladimír, Diana Bošanská, Martin Pipíška, Libor Ďuriška, Stephen M. Bell, and Gerhard Soja. "Physicochemical Characterization of Cherry Pits-Derived Biochar." Materials 15, no. 2 (2022): 408. http://dx.doi.org/10.3390/ma15020408.

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Although the suitability of some biochars for contaminants’ sorption separation has been established, not all potential feedstocks have been explored and characterized. Here, we physicochemically characterized cherry pit biochar (CPB) pyrolyzed from cherry pit biomass (CP) at 500 °C, and we assessed their As and Hg sorption efficiencies in aqueous solutions in comparison to activated carbon (AC). The basic physicochemical and material characterization of the studied adsorbents was carried out using pH, electrical conductivity (EC), cation exchange capacity (CEC), concentration of surface funct

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Tikhonova, Viktoria Vladlenovna, Tatyana Vasilievna Sotnikova, Gleb Vladimirovich Erlin, Olga Yuryevna Strelova, and Alexander Nikolaevich Grebenyuk. "Synthetic genistein is a potential active pharmaceutical substance for the development of radiation countermeasure agents." Radiation biology. Radioecology 64, no. 1 (2024): 21–29. http://dx.doi.org/10.31857/s0869803124010038.

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The development of dosage forms of effective radiation countermeasure agents remains an urgent task of modern radiobiology. The purpose of this study is to determine the quality indicators of domestic synthetic genistein as a potential active pharmaceutical substance for the development of radiation countermeasure agents. The material of the study was two samples of genistein synthesized at the SPC “Farmzashchita” of the FMBA of Russia and at the St. Petersburg State Chemical and Pharmaceutical University of the Ministry of Health of Russia, and natural genistein isolated from soybean seed cak

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Trainer, Peter J. "ACROSTUDY: the first 5 years." European Journal of Endocrinology 161, suppl_1 (2009): S19—S24. http://dx.doi.org/10.1530/eje-09-0322.

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ACROSTUDY is an observational registry intended to collect safety and efficacy data on pegvisomant therapy. A total of 792 patients have been enrolled, of whom 83% had commenced pegvisomant prior to recruitment. The mean follow-up is 1.66 years with the mean duration of pegvisomant therapy 3.31 years representing 2625 patient years of treatment. About 90% of patients were on once daily pegvisomant, and 67% were on monotherapy. Disappointingly, IGF1 was normalised in <70% of patients; furthermore, in 80% of patients with an elevated IGF1, the daily dose of pegvisomant was 20 mg or less. A to

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