Partial molar volumes of .alpha.-amino acids with ionogenic side chains in water

1984 ◽  
Vol 88 (14) ◽  
pp. 3129-3131 ◽  
Author(s):  
M. V. R. Rao ◽  
M. Atreyi ◽  
M. R. Rajeswari
Keyword(s):  
Amino Acids ◽  
Partial Molar Volumes ◽  
Side Chains ◽  
Molar Volumes

Specific interactions between amino acid side chains — a partial molar volume study

1988 ◽  
Vol 66 (3) ◽  
pp. 487-490 ◽  
Author(s):  
Mandapati V. R. Rao ◽  
Mahalakshmi Atreyi ◽  
Moganty R. Rajeswari
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Aspartic Acid ◽  
Partial Molar Volumes ◽  
Ionic Species ◽  
Side Chains ◽  
Specific Interactions ◽  
Molar Volumes ◽  
Amino Acid Side Chains ◽  
Experimental Values

Partial molar volumes of the following mixtures, [Formula: see text](mix) were determined in water at 20 °C: (1) glutamic acid: glycine; (2) arginine:glycine; (3) arginine:glutamic acid; (4) arginine: aspartic acid; (5) lysine:glutamic acid, and (6) lysine: aspartic acid. Partial molar volumes of the mixtures calculated using [Formula: see text] of various ionic species of the amino acids agreed with the experimental values for systems 1 and 2, but were less than the experimental values for systems 3 to 6. The positive deviations, [Formula: see text] (mix), of the experimental values from the calculated values are discussed in terms of "specific interactions" between ionogenic side chains. The extent of interaction is greater in systems containing aspartic acid and/or arginine.

scholarly journals Effect of Hydroxylamine Sulfate on Volumetric Behavior of Glycine,L-Alanine, andL-Arginine in Aqueous Solution

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jie Chen ◽  
Sheng Fang ◽  
Yu-Gang Shi ◽  
Yue-Cheng Meng ◽  
Da-Hai Ren
Keyword(s):  
Experimental Data ◽  
Amino Acids ◽  
Atmospheric Pressure ◽  
Partial Molar Volumes ◽  
Hydration Numbers ◽  
Molar Volumes ◽  
Mixing Effects ◽  
Sulfate Solutions ◽  
Volumetric Behavior ◽  
Hydroxylamine Sulfate

The apparent molar volumes of glycine,L-alanine, andL-arginine in aqueous hydroxylamine sulfate solutions have been determined atT=298.15 K and atmospheric pressure. The standard partial molar volumes,V20, corresponding partial molar volumes of transfer,ΔtrV20, and hydration numbers,NH, have been calculated for theseα-amino acids from the experimental data. TheΔtrV20values are positive for glycine,L-alanine, andL-arginine and are all increased with the increase in the concentration of hydroxylamine ions. These parameters obtained from the volumetric data are interpreted in terms of various mixing effects between amino acids and hydroxylamine sulfate in aqueous solutions.

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