Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Anwar Ali Priyanka Bidhuri Sahar Uzair
Abstract	Ultrasonic speed, u and density, ρ have been measured for dl-alanine (Ala) and l-phenylalanine (Phe) in aqueous β-cyclodextrin (β-CD) at 298.15, 303.15, 308.15, and 313.15 K. The complexation of Ala and Phe with β-CD has been studied by means of UV–vis and thermodynamic (ultrasonic speed and density) studies. Using the measured ultrasonic speed and density data the apparent molar compressibility (κS,φ), apparent molar volume (Vφ), limiting apparent molar compressibility (κS,φ0), limiting apparent molar volume (Vφ0), their constants (SK and Sv), and hydration number (nH) have been obtained. The positive values of transfer properties at infinite dilution for Ala and Phe in β-CD is the outcome of the balance between released water molecules from β-CD cavity and hydrophobic groups of Ala and Phe that enter into the macrocycle β-CD cavity. The experimental results have also been discussed on the basis of UV–vis absorbance. The results indicate the formation of a more stable host–guest complex between Phe-β-CD than between Ala-β-CD.
Related Links	http://www.sciencedirect.com/science/article/pii/S1319610313001166
ISSN	13196103
DOI	10.1016/j.jscs.2013.11.003
Journal	Journal of Saudi Chemical Society
Issue Number	S1
Volume Number	21
Language	English
Publisher	Elsevier
Publisher Date	2017-01-01
Publisher Place	Saudi Arabia
Access Restriction	Open
Subject Keyword	Chemistry Amino Acid Partial Molar Isentropic Compressibility Partial Molar Volume Hydration Number Uv–visible Spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry