Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions
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...
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| Format: | Article |
| Language: | English |
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Elsevier
2017-01-01
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| Series: | Journal of Saudi Chemical Society |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1319610313001166 |
| _version_ | 1818344549252071424 |
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| author | Anwar Ali Priyanka Bidhuri Sahar Uzair |
| author_facet | Anwar Ali Priyanka Bidhuri Sahar Uzair |
| author_sort | Anwar Ali |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T16:48:14Z |
| format | Article |
| id | doaj.art-0aeb3a960cd04e54a926237a556135dd |
| institution | Directory Open Access Journal |
| issn | 1319-6103 |
| language | English |
| last_indexed | 2024-12-13T16:48:14Z |
| publishDate | 2017-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Saudi Chemical Society |
| spelling | doaj.art-0aeb3a960cd04e54a926237a556135dd2022-12-21T23:38:06ZengElsevierJournal of Saudi Chemical Society1319-61032017-01-0121S1S136S14210.1016/j.jscs.2013.11.003Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutionsAnwar AliPriyanka BidhuriSahar UzairUltrasonic 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.http://www.sciencedirect.com/science/article/pii/S1319610313001166Amino acidPartial molar isentropic compressibilityPartial molar volumeHydration numberUV–visible spectroscopy |
| spellingShingle | Anwar Ali Priyanka Bidhuri Sahar Uzair Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions Journal of Saudi Chemical Society Amino acid Partial molar isentropic compressibility Partial molar volume Hydration number UV–visible spectroscopy |
| title | Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions |
| title_full | Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions |
| title_fullStr | Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions |
| title_full_unstemmed | Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions |
| title_short | Thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β-cyclodextrin solutions |
| title_sort | thermodynamic and spectroscopic studies of alanine and phenylalanine in aqueous β cyclodextrin solutions |
| topic | Amino acid Partial molar isentropic compressibility Partial molar volume Hydration number UV–visible spectroscopy |
| url | http://www.sciencedirect.com/science/article/pii/S1319610313001166 |
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