The Thermodynamics of Ionization of Amino Acids. IV. The First Ionization Constants of Some Glycine Peptides1

1957 ◽  
Vol 79 (23) ◽  
pp. 6151-6156 ◽  
Author(s):  
Edward J. King
Keyword(s):  
Amino Acids ◽  
Ionization Constants ◽  
Thermodynamics Of Ionization

Thermodynamics of ionization of trans-crotonic and adipic acids in water; the silver – silver adipate electrode

1980 ◽  
Vol 58 (4) ◽  
pp. 323-327 ◽  
Author(s):  
Upendra Nath Dash ◽  
Uttam Kumar Nayak
Keyword(s):  
Adipic Acid ◽  
Silver Chloride ◽  
Ionization Constants ◽  
Thermodynamic Quantities ◽  
Liquid Junction ◽  
Different Temperatures ◽  
Heat Capacity Changes ◽  
Silver Silver ◽  
Silver Silver Chloride ◽  
Thermodynamics Of Ionization

The ionization constant, K, of trans-crotonic acid, and the first and second ionization constants, K1 and K2, of adipic acid have been determined in water at seven different temperatures ranging from 15 to 45 °C with the help of the cells without liquid junction using silver – silver chloride and quinhydrone electrodes. The variations of pK, pK1, and pK2 with temperature have been expressed by the equations[Formula: see text]and[Formula: see text]From the temperature coefficient of the ionization constants, the standard enthalpy, entropy, Gibbs energy, and heat capacity changes of the corresponding dissociation processes have been calculated. Using the values of ionization constants of adipic acid, the standard potential of the Ag(s)/Ag2Ad(s)/Ad2− electrode, and the related standard thermodynamic quantities for the electrode process[Formula: see text]have been calculated in water at those temperatures.

Micellar-mediated shifts of ionization constants of amino acids and peptides

1990 ◽  
Vol 239 ◽  
pp. 121-128 ◽  
Author(s):  
Morteza G. Khaledi ◽  
Andrew H. Rodgers
Keyword(s):  
Amino Acids ◽  
Ionization Constants

Thermodynamics of ionization of 2,4- and 2,5-dinitrophenol in dimethylsulfoxide

1980 ◽  
Vol 58 (10) ◽  
pp. 970-973 ◽  
Author(s):  
Kok-Siong Siow ◽  
Kok-Peng Ang
Keyword(s):  
Thermodynamic Functions ◽  
Solvent Effects ◽  
Ionization Constants ◽  
Conductance Method ◽  
Thermodynamics Of Ionization

Ionization constants of 2,4- and 2,5-dinitrophenol in dimethylsulfoxide were measured by the conductance method at five temperatures ranging from 20 to 40 °C. The ionization constants of 2,4-dinitrophenol are much larger than those of 2,5-dinitrophenol, and in both cases they increase with temperature. The thermodynamic functions of ionization are discussed in terms of Hepler's theory for substituent and solvent effects. The ionization of phenols in dimethylsulfoxide is controlled by the enthalpy factor, both internal and environmental, which is in contrast to the entropy-controlled process in water.

scholarly journals Ionization constants of aqueous amino acids at temperatures up to 250°C using hydrothermal pH indicators and UV-visible spectroscopy: Glycine, α-alanine, and proline

2005 ◽  
Vol 69 (12) ◽  
pp. 3029-3043 ◽  
Author(s):  
Rodney G.F. Clarke ◽  
Christopher M. Collins ◽  
Jenene C. Roberts ◽  
Liliana N. Trevani ◽  
Richard J. Bartholomew ◽  
...  
Keyword(s):  
Amino Acids ◽  
Ionization Constants ◽  
Visible Spectroscopy ◽  
Ph Indicators ◽  
Uv Visible
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