Untitled

Densities and ultrasonic speed of 2-hydroxy-5-methyl-3-nitro acetophenone in N,N-dimethylformamide at different temperatures

“…This makes the lone pair at nitrogen more perceptible towards donation [21], whereas ketones are electron acceptors [22]. Hence electron donor-acceptor complex between the vacant 2p orbital of the oxygen atom of carbonyl group of ketone and lone pair electrons on nitrogen in DMF is of sensitive towards various types of molecular interactions occurring in solution [23,24].…”

Thermodynamic Studies on Amino Acid Solvation in some Aqueous Alcohols

“…Table 4. Transfer free energies of interaction DG 0 t (Int) values have been calculated using equation (1) and are presented in Table 5. of amino acids with mol% of aqueous alcohols.…”

“…19 Recently transfer molar volume and partial molar volume of some amino acids, nucleic acid bases and nucleosides from water to aqueous binary mixture have been interpreted by the cosphere overlap model else- where. 1,[20][21] The Zwitter ionic heads of amino acids are hydrated by hydrophilic hydration whereas its apolar part is hydrated by hydrophobic hydration. Overlap of different hydrated spheres of amino acids and ROH take place.…”

“…Much attention has been paid [1][2][3][4] to determine the various thermodynamic properties of an aqueous solution of amino acids at different aqueous organic media. The purpose of such studies is to gain the various aspects of protein folding and unfolding processes and protein hydration.…”

Ultrasonic Studies of Some Biomolecules in Aqueous Guanidine Hydrochloride Solutions at 298.15 K

“…During the last two decades, the ultrasonic study of the carbohydrates in aqueous electrolytic medium, has gained much importance in assessing the nature of molecular interaction present in the mixture. The study of the carbohydrates / saccharides has become a subject of increasing interest because of the multidimensional, physical, biochemical and industrially useful properties of these compounds [1][2][3][4] , in addition to their importance to the food pharmaceutical and chemical industries, the simple saccharides have received considerable attention for their ability to protect biological macromolecules 5 .…”