The Acidic Constants of 2-Hydroxybenzohydroxamic Acid in NaClO4 Solutions at 25°C

2004 ◽  
Vol 94 (4) ◽  
pp. 295-302 ◽  
Author(s):  
Liberato Ciavatta ◽  
Gaetano de Tommaso ◽  
Mauro Iuliano
Keyword(s):  
Acidic Constants

Spectrophotometric and potentiometric determination of acidic constants of oxo-phenyl pyridinium monoxime and dioxime

1988 ◽  
Vol 119 (10) ◽  
pp. 1069-1078 ◽  
Author(s):  
Ljiljana T. Milovanović ◽  
Katarina D. Karljiković-Rajić ◽  
Branislava S. Stanković
Keyword(s):  
Potentiometric Determination ◽  
Acidic Constants

Article

1998 ◽  
Vol 76 (5) ◽  
pp. 576-582
Author(s):  
Patricia Gabriela Molina ◽  
María Alicia Zón ◽  
Héctor Fernández
Keyword(s):  
Dissociation Constants ◽  
Monomethyl Ether ◽  
Spectroscopic Studies ◽  
Acid Dissociation ◽  
Alternariol Monomethyl Ether ◽  
Acid Dissociation Constants ◽  
Ph Values ◽  
Acidic Constant ◽  
Acidic Constants ◽  
Good Agreement

The acid dissociation constants for alternariol monomethyl ether (AME), altertoxin-I (ATX-I), and alternariol (AOH), three of the Alternaria alternata genus mycotoxins, are estimated through conventional UV-VIS spectroscopic studies at different pH values. Experimental variations of absorbance as a function of pH at a given wavelength were fitted by using the exact equations that describe the systems studied. Good agreement between the experimental absorbance vs. pH plots and the curves generated by the fitting process was found. A comparison between the acidic constants for the first step of dissociation of these mycotoxins and the value for the acidic constant of phenol is discussed by assuming that phenolic structures are responsible for the acidity of these mycotoxins.Key words: mycotoxins, alternariol monomethyl ether, altertoxin-I, alternariol, acidic constants.

Determination of acidic constants of some phenyl-hydroxyiminoethyl quinolinium compounds

1986 ◽  
Vol 117 (5) ◽  
pp. 661-670 ◽  
Author(s):  
Katarina D. Karljiković ◽  
Branislava S. Stanković ◽  
Emil B. Milosavljević ◽  
Zlatko J. Binenfeld
Keyword(s):  
Acidic Constants

Solubility and Acidic Constants ofl-Cystine in NaClO4Aqueous Solutions at 25 °C

2009 ◽  
Vol 54 (11) ◽  
pp. 3037-3042 ◽  
Author(s):  
Emilia Furia ◽  
Mariaraffaella Falvo ◽  
Raffaella Porto
Keyword(s):  
Acidic Constants

Standard Potential and Acidic Constants of Oleuropein

2010 ◽  
Vol 55 (8) ◽  
pp. 2824-2828 ◽  
Author(s):  
Emilia Furia ◽  
Monica Nardi ◽  
Giovanni Sindona
Keyword(s):  
Standard Potential ◽  
Acidic Constants

scholarly journals The affinity constants of amphoteric electrolytes. I.—Methyl derivatives of para-aminobenzoic acid and of glycine

1906 ◽  
Vol 78 (522) ◽  
pp. 82-102 ◽  
Keyword(s):  
Methyl Acetate ◽  
Comparison Method ◽  
Separate Experiment ◽  
Aminobenzoic Acid ◽  
Methyl Group ◽  
Affinity Constants ◽  
Conductivity Water ◽  
Methyl Derivatives ◽  
Derivatives Of ◽  
Acidic Constants

The following investigation was undertaken in order to determine the influence on the basic and acidic constants of successive introductions of a methyl group into an amino-acid, including the effect of changing the acid into the corresponding methyl ester. Two series of compounds were investigated, namely, the methyl derivatives of p -aminobenzoic acid and of glycine. Constants for p -aminobenzoic acid, glycine, and some of its methyl derivatives had already been determined by Winkelblech. Methods . Whenever practicable the basic constant k b was determined by means of the catalysis of methyl acetate, using the comparison method of Walker and Wood. The end point was determined in a separate experiment with decinormal hydrochloric acid; and it was found that the same result was obtained whether or not the bottle containing the reaction mixture had been opened to admit of intermediate readings being taken. In every case 1 c.c. at a time was withdrawn and titrated with N/20 caustic soda, which had been prepared from sodium and conductivity water; and unless otherwise stated, phenolphthalein was used as indicator.

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