Results 1 to 10 of about 86,580 (163)

Calculation of Crystal-Solution Dissociation Constants [PDF]

Biomolecules, 2022
The calculation of dissociation constants is an important problem in molecular biophysics. For such a calculation, it is important to correctly calculate both terms of the binding free energy; that is, the enthalpy and entropy of binding.
Sergiy O. Garbuzynskiy, Alexei V. Finkelstein   +1 more
doaj   +2 more sources

Determination of Acid Dissociation Constants (pKa) of Bicyclic Thiohydantoin-Pyrrolidine Compounds in 20% Ethanol-Water Hydroorganic Solvent [PDF]

International Journal of Analytical Chemistry, 2014
The acid dissociation constants of potential bioactive fused ring thiohydantoin-pyrrolidine compounds were determined by potentiometric titration in 20% (v/v) ethanol-water mixed at 25±0.1°C, at an ionic background of 0.1 mol/L of NaCl using the ...
Yahya Nural, H. Ali Döndaş, Hayati Sarı, Hasan Atabey, Samet Belveren, Müge Gemili   +5 more
doaj   +2 more sources

Current estimates of K₁* and K₂* appear inconsistent with measured CO₂ system parameters in cold oceanic regions [PDF]

Ocean Science, 2020
Seawater absorption of anthropogenic atmospheric carbon dioxide (CO2) has led to a range of changes in carbonate chemistry, collectively referred to as ocean acidification.
O. Sulpis, O. Sulpis, S. K. Lauvset, M. Hagens   +3 more
doaj   +1 more source

Wide pH Range Potentiometric and Spectrophotometric Investigation into the Acidic Constants of Quercetin, Luteolin and l-Ascorbic Acid in Aqueous Media

Applied Sciences, 2023
It is now well established that the dissociation constants of an organic compound are characteristic of the types of groups, or the combinations of groups, contained in it.
Luana Malacaria, Emilia Furia
doaj   +1 more source

Determination of the Dissociation Constants of 16 Active Ingredients in Medicinal Herbs Using a Liquid–Liquid Equilibrium Method

Separations, 2021
The dissociation constant is an important physicochemical property of drug molecules that affects the pharmacokinetic and pharmacodynamic properties of drugs.
Wanying Wang, Baixiu Zheng, Jiahao Wu, Weisong Lv, Peiying Lin, Xingchu Gong   +5 more
doaj   +1 more source

A study of the behaviour of some substituted 1,2,4-triazoline-3-thiones in different media [PDF]

Journal of the Serbian Chemical Society, 2000
The acid-base behaviour of 4-phenyl-5-(4-R-benzyl)-1,2,4-triazoline-3-thione (1(R = OH); 2(R = OC2H5)) was studied in aqueous sulfuric acid and sodium hydroxide solutions.
Arman-Zubić Lučijana, Perišić-Janjić Nada, Lazarević Marija   +2 more
doaj   +3 more sources

Potentiometeric Study of New Schiff Base Complexes Bearing Morpholine in Ethanol-water Medium with some Metal Ions

International Journal of Electrochemical Science, 2019
Acid dissociation constants of 2-[(4-morpholinobenzylidene)amino]phenol (HL) and the equilibrium constants of their metal complexes with Cu2+, Zn2+, Sr2+, Cd2+, Ba2+ and Hg2+ ions were investigated using a pH metric titration technique in 40 % (v/v ...
Badriah S. Al-Farhan, Gamal A. Gouda, O.A. Farghaly, A.K.E.L. Khalafawy   +3 more
doaj   +1 more source

LILBID laser dissociation curves: a mass spectrometry-based method for the quantitative assessment of dsDNA binding affinities

Scientific Reports, 2020
One current goal in native mass spectrometry is the assignment of binding affinities to noncovalent complexes. Here we introduce a novel implementation of the existing laser-induced liquid bead ion desorption (LILBID) mass spectrometry method: this new ...
Phoebe Young, Genia Hense, Carina Immer, Jens Wöhnert, Nina Morgner   +4 more
doaj   +1 more source

Protolysis and Complex Formation of Organophosphorus Compounds—Characterization by NMR-Controlled Titrations

Molecules, 2019
Phosphonic acids, aminophosphonic acids, and phosphonocarboxylic acids are characterized by an advanced hyphenated technique, combining potentiometric titration with NMR spectroscopy.
Gerhard Hägele
doaj   +1 more source

Synthesis and Determination of Acid Dissociation Constants in Dimethyl Sulfoxide–Water Hydroorganic Solvent of 5,5-Diphenylpyrrolidine N-Aroylthiourea Derivatives

Journal of the Turkish Chemical Society, Section A: Chemistry, 2017
Novel 5,5-diphenylpyrrolidineN-aroylthioureas, containing 4-methylbenzoyl, 2-chlorobenzoyl,2,4-dichlorobenzoyl, and2-naphthoyl, were synthesized and their structural analysis was performed using 1H nuclear magnetic resonance (NMR), 13C NMR, Fourier ...
Yahya Nural
doaj   +1 more source