Apparent molal heat capacities of organic compounds in aqueous solution. Part 3.—ω-Amino acids and related compounds

1977 ◽  
Vol 73 (0) ◽  
pp. 476 ◽  
Author(s):  
Sergio Cabani ◽  
Giovanni Conti ◽  
Enrico Matteoli ◽  
Alessandro Tani
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Organic Compounds ◽  
Heat Capacities ◽  
Apparent Molal Heat Capacities ◽  
Related Compounds

Apparent molal heat capacities and volumes of amino acids in aqueous polyol solutions

1978 ◽  
Vol 56 (13) ◽  
pp. 1827-1831 ◽  
Author(s):  
Giuseppa DiPaola ◽  
Bernard Belleau
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Aqueous Solutions ◽  
Transfer Functions ◽  
Heat Capacities ◽  
Side Chains ◽  
Dilute Solutions ◽  
Flow Microcalorimeter ◽  
Regular Increase ◽  
Apparent Molal Heat Capacities

Densities (24 °C) and volumetric specific beats (25 °C) were measured for amino acids (0.05–0.5 m) containing apolar side chains in water, and in aqueous solutions of glycerol, mannitol, sorbitol, NaCl, urea, and Gu•HCl, with a flow densimeter and flow microcalorimeter respectively.The derived apparent molal quantifies and transfer functions of the amino acids in aqueous polyol solutions reveal no specificities which might explain the origin of the unique behavior of polyols in protein systems. However, the study did reveal a regular increase in the structure-making ability of the amino acid as the hydrophobicity of the side chains increased. This structure-making tendency was reduced significantly in dilute solutions of the higher polyols.

The Apparent Molal Heat Capacities and Volumes of the Amino Acids and their Uncharged Isomers.

1942 ◽  
Vol 30 (2) ◽  
pp. 181-193 ◽  
Author(s):  
Frank T. Gucker ◽  
Irving M. Klotz ◽  
Theodore W. Allen
Keyword(s):  
Amino Acids ◽  
Heat Capacities ◽  
Apparent Molal Heat Capacities

Reactions of Alloxan and Related Compounds

1977 ◽  
Vol 32 (4) ◽  
pp. 447-452 ◽  
Author(s):  
Akila Said ◽  
Daisy Hanna Fleita ◽  
Hakim Grace Shinouda
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Related Compounds

A detailed investigation has been carried out on the effect of alloxan, alloxanic acid and ninhydrin on the rate of disappearance of alanine in buffered aqueous solution at pH 7 and on amino acids in blood both in vitro and in vivo. The results obtained indicate the possibility that the interaction of alloxan and tissue amino acids might have an important role in the diabetogenic effect of alloxan.

Additivity schemes permitting the estimation of partial molar heat capacities of organic compounds in aqueous solution

1977 ◽  
Vol 55 (21) ◽  
pp. 3700-3706 ◽  
Author(s):  
J. Peter Guthrie
Keyword(s):  
Aqueous Solution ◽  
Organic Compounds ◽  
Weighted Average ◽  
Heat Capacities ◽  
Group Contributions ◽  
Partial Molar Heat Capacities ◽  
Neutral Organic Compounds

The available [Formula: see text] values for neutral organic compounds in aqueous solution can be fitted with useful precision by additivity schemes based on atomic, bond, or group contributions. For the set of 132 compounds these schemes require 11, 14, or 49 parameters and give weighted average deviations of 14, 9, or 6 J K−1 mol−1. For acyclic molecules the atomic contributions scheme permits chemically useful estimates of [Formula: see text] to be made for compounds of C, H, O, and N.

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