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45.241  Articles
1 of 4.525 pages  |  10  records  |  more records»
Aim. To study the acid-base properties of derivatives of 2-(benzoylamino)(1-R-2-oxoindolin-3-ylidene)acetic acid substituted by the location 1 of oxoindolin fragment.Results and discussion. The compounds studied are weak acids, their strength decreases wi... see more

The solvatochromic responses of six indicators namely Sudan orange, Alizarin yellow R, Aurin tricarboxylic acid, Alizarin yellow GG, Titan yellow and Eriochrome black-T, dissolved in seven solvents of different polarities, have been measured at room tempe... see more

By using the steady-state spectroscopy technique, it was possible to determine the acidity constants of 2.7-naphthalenediol (27ND) in the ground (pKa) and excited states (pKa*). The results of pKa and pKa* obtained, were respectively 9.54 and 6.5. This l... see more

The application of universal theory of M.I. Usanovich in science and education is presented in this paper. On the basis of the ionic theory of Arrhenius is considered the degree of dissociation, the constant dissociation, pH value and the equilibrium of c... see more

In this work, by potentiometric titration, the dissociation of the grafted chains of polyacrylic acid in copolymer composition was studied. An increase in the content of units of acrylic acid (AA) in the copolymer leads to a decrease in the values of diss... see more

The pKa values of twelve ß-hydroxy-ß-arylalkanoic acids and ibupro­fen were determined using a modified RP-HPLC method. The stationary phase was octadecyl modified (C-18) silica gel, and the mobile phases were mixtures of methanol and one of ten diff... see more

This paper presents a surface plasmon resonance (SPR) spectroscopy-based evaluation process which provides information on kinetic and thermodynamic aspects of the interactions between proteins and a drug molecule. Reversible binding of kynurenic acid (KYN... see more

En este trabajo se determinó una constante de acidez (pKa) para la molécula de metronidazol protonado (MTZH+) por espectroscopía de ultravioleta (UV) en medio acuoso. Los valores experimentales obtenidos se trataron con el programa computacional (SQUAD) o... see more

In this work the UV/VIS spectroscopy was used to study the photo degradation by UV light of the salicylic acid in cavity of ß-cyclodextrin. A reduction in the speed of degradation of the salicylic acid of 34.5% in pH 7 and of 17.5% in pH 4 was observed wh... see more

1 of 4.525 pages  |  10  records  |  more records»