Spectroscopic studies of the physical properties of hyaluronate films: the origin of the phase transition

Infrared (IR) spectroscopy and optical microscopy have been performed as a function of relative humidity (rh) on wet-spun oriented films of hyaluronate (HA) prepared with various counterions. Complete swelling measurements have been obtained through optical microscopy for films of Cs-, Mg-, and CaHA. IR spectroscopy of Cs-, Mg-, Ca-, and LiHA films was performed for skeletal vibrations (800-1000 cm(-1)) and for vibrational modes (1150-1300 cm(-1)) attributed to C-C and C-O stretching modes and C-C-H and C-O-H bending modes. These techniques reveal evidence of a counterion-dependent phase transition occuring at high relative humidities. Optical birefringence measurements on the polycrystalline samples showed order before and disorder after the transition from lower to higher humidity.

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Mediation of a Phase Transition in Hyaluronate Films by the Counterions Li, Cs, Mg and Ca as Observed by Infrared Spectroscopy, Optical Microscopy, and Optical Birefringence

Marlowe

Hoppe

Rupprecht

et al. 1999

Journal of Biomolecular Structure and Dynamics

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A Raman Study of the Hydration of Wet-Spun Films of Li-hyaluronate

Reineck

Deanna

et al. 2003

Journal of Biomolecular Structure and Dynamics

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Binding of the water of primary hydration to the sodium and cesium salts of deoxyribonucleic acid and potassium hyaluronate

et al. 1998

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Differential scanning calorimetry ͑DSC͒ has been used to evaluate the average enthalpy of desorption of the water of primary hydration bound to wet-spun films of potassium hyaluronate ͑KHA͒ and CsDNA. The enthalpies were measured to be 0.24Ϯ0.08 eV/H 2 O molecule for KHA and 0.32Ϯ0.10 eV/H 2 O molecule for CsDNA. A Kissinger analysis was used to extract the net activation energy (0.61Ϯ0.04 eV͒ for the desorption of this water from KHA by analyzing DSC data acquired at different heating rates. The average effective force constants at 295 K of this water bound to KHA (63Ϯ3 dyn/Å͒ and NaDNA (17Ϯ4 dyn/Å͒ are determined from Rayleigh scattering of Mossbauer radiation data ͓G. Albanese, A. Deriu, F. Cavatorta, and A. Rupprecht, Hyperfine Interact. 95, 97 ͑1995͔͒ via a harmonic approximation.

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Spectroscopic studies of the physical properties of hyaluronate films: the origin of the phase transition

Cited by 3 publications

References 17 publications

Mediation of a Phase Transition in Hyaluronate Films by the Counterions Li, Cs, Mg and Ca as Observed by Infrared Spectroscopy, Optical Microscopy, and Optical Birefringence

Mediation of a Phase Transition in Hyaluronate Films by the Counterions Li, Cs, Mg and Ca as Observed by Infrared Spectroscopy, Optical Microscopy, and Optical Birefringence

A Raman Study of the Hydration of Wet-Spun Films of Li-hyaluronate

Binding of the water of primary hydration to the sodium and cesium salts of deoxyribonucleic acid and potassium hyaluronate

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