Volumetric and calorimetric investigations of molecular interactions in some amino acids and peptides in the combined presence of surfactants and glycine betaine

Misra, Pinaki; Kishore, Nand

doi:10.1016/j.jct.2012.05.031

Cited by 24 publications

(12 citation statements)

References 33 publications

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“…The V 2,ϕ o values for GABA in water (Table ) agree well with the literature values. − The S v values are found to be positive for GABA in water as well as in aqueous solutions of CAF. In water, the V 2,ϕ o values for GABA shows a slight increase with temperature, and this behavior is characteristic of solutes showing hydrophilic hydration .…”

Section: Resultssupporting

confidence: 86%

“…The K s,2 o values for GABA in water agree well (Table 6) with the reported values. [31][32][33][34]38 Millero et al 19 further made an approximation to the intrinsic partial molar isentropic compressibility as: K s,2 o (int) ≈ 0, as one would expect K s,2 o (int) to be very small. Therefore, K s,2 o may be thought to represent the electrostriction partial molar isentropic compressibility, K s,2 o (elect).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Effect of Caffeine on the Physicochemical Properties of Neurotransmitter GABA: Thermodynamic and Theoretical Approach

et al. 2019

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The density, ρ, and the speed of sound, u, of γ-aminobutyric acid (GABA) in water and in (0.005, 0.01, 0.02, 0.04, and 0.06) mol·kg–1 aqueous caffeine (CAF) solutions were measured at temperatures, T = (293.15–318.15) K and P = 0.1 MPa. The measured data have been used to calculate apparent molar volumes at infinitesimal concentration (V 2,ϕ o), apparent molar isentropic compressibility (K 2,ϕ o), the corresponding transfer parameters, and other derived properties. The negative transfer values suggest the dominance of hydrophobic interactions and the structure-breaking tendency of CAF molecules. UV–visible spectroscopic studies have been carried out, and the shifts in the absorption spectra signify the role of hydrogen-bonding interactions. The structures of GABA and CAF have also been optimized in gas phase and solution phase by employing density functional theory at B3LYP/6-31+G* theoretical level, and the H-bond interactions between the two molecules have been studied. It is observed that there are strong H-bond interactions between GABA and CAF.

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Section: Resultssupporting

confidence: 86%

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Caffeine on the Physicochemical Properties of Neurotransmitter GABA: Thermodynamic and Theoretical Approach

et al. 2019

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“…Both hydrophobicity and molecular geometry played an important role in cloud point variations. Misra et al [115] considered the apparent molar adiabatic compressibility and apparent molar volume values of glycine, L-alanine, Lvaline, L-leucine, DL-a-amino-n-butyric acid (ABA), diglycine and triglycine in the aqueous surfactant solutions by using sound and density measurements. Calorimetric method was used to determine the heat evolved or absorbed.…”

Section: Nonionic Surfactantsmentioning

confidence: 99%

Surfactant–Amino Acid and Surfactant–Surfactant Interactions in Aqueous Medium: a Review

Malik

2015

Appl Biochem Biotechnol

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An overview of surfactant-amino acid interactions mainly in aqueous medium has been discussed. Main emphasis has been on the solution thermodynamics and solute-solvent interactions. Almost all available data on the topic has been presented in a lucid and simple way. Conventional surfactants have been discussed as amphiphiles forming micelles and amino acids as additives and their effect on the various physicochemical properties of these conventional surfactants. Surfactant-surfactant interactions in aqueous medium, various mixed surfactant models, are also highlighted to assess their interactions in aqueous medium. Finally, their applied part has been taken into consideration to interpret their possible uses.

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“…On the other hand, DAP is also a water-soluble salt. There are extensive studies regarding the interactions between saccharides and amino acids − and on the thermodynamics of amino acids + water + saccharides − and of saccharides + salt–water-mixed solvents. − There is wide research on the studies of densities and speeds of sound for aqueous solutions of sucrose with different additives ,,, but till now, no comparative studies have been carried out on the acoustic and volumetric properties of sucrose with aqueous ADP and DAP. So, we prearranged to have volumetric and acoustic (compressibility) studies on sucrose with aqueous ADP and DAP solutions.…”

Section: Introductionmentioning

confidence: 99%

Densities and Speeds of Sound for Sucrose in Aqueous Solutions of Ammonium Phosphate Salts at Different Temperatures through Density and Speed of Sound Measurements

2019

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Volumetric and acoustic studies of sucrose with ammonium phosphate salts, namely, ammonium dihydrogen phosphate (ADP) and diammonium hydrogen phosphate (DAP), have been carried out using an oscillating U-tube instrument, namely, Anton Paar DSA 5000 M. Densities and speeds of sound in aqueous solutions of sucrose and mixed aqueous solutions of (0.0, 0.5, 1.0, and 1.5) mol• kg −1 ADP and DAP have been measured at four different temperatures (288.15, 298.15, 308.15, and 318.15) K and an experimental pressure of p = 0.1 MPa. Making use of the density and speed of sound data, the respective apparent molar volume (V ϕ ) and apparent molar isentropic compression (K ϕ,s ) in aqueous solutions of sucrose and mixed aqueous solutions of ADP and DAP have been determined at the above four temperatures.

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Volumetric and calorimetric investigations of molecular interactions in some amino acids and peptides in the combined presence of surfactants and glycine betaine

Cited by 24 publications

References 33 publications

Effect of Caffeine on the Physicochemical Properties of Neurotransmitter GABA: Thermodynamic and Theoretical Approach

Effect of Caffeine on the Physicochemical Properties of Neurotransmitter GABA: Thermodynamic and Theoretical Approach

Surfactant–Amino Acid and Surfactant–Surfactant Interactions in Aqueous Medium: a Review

Densities and Speeds of Sound for Sucrose in Aqueous Solutions of Ammonium Phosphate Salts at Different Temperatures through Density and Speed of Sound Measurements

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