Optical and physical properties of wet-spun films of Na-hyaluronate. Evidence of a phase transition

Flowers, M. R.; Marlow, Rae; Lee, S.A.; Lavalle, N.; Rupprecht, A.

doi:10.1016/s0006-3495(92)81604-1

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…Additional experimental evidence of this phase transition in NaHAhas been found very recently by Flowers et al (5). They measured the refractive indices and water content of wet-spun films ofNaHA and extracted the optical polarizabilities.…”

Section: Introductionmentioning

confidence: 59%

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Raman and Infrared Studies of Wet-Spun Films of Na-Hyaluronate

Lee

Myers²,

Powell³

et al. 1993

Journal of Biomolecular Structure and Dynamics

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Raman and infrared (IR) studies of Na-hyaluronate films have been performed as a function of relative humidity (RH) and temperature. These data show a number of vibrational modes. Certain of these modes are evident in both the Raman and IR data. Changes in the Raman spectra are observed at the order-disorder phase transition (between 84 and 90% RH) and suggest that the molecular conformation changes at the phase transition.

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Section: Introductionmentioning

confidence: 59%

“…Figure 3 shows the Raman spectra for samples between 54 and 92% RH. Evidence for a phase transition has been observed between 84 and 90% RH by Brillouin spectroscopy (3,20), x-ray diffraction (3), and optical polarizabilities (5). An examination of Figure 3 shows essentially no change in the Raman spectra between 54 and 88% RH.…”

Section: Methodsmentioning

confidence: 92%

Raman and Infrared Studies of Wet-Spun Films of Na-Hyaluronate

Lee

Myers²,

Powell³

et al. 1993

Journal of Biomolecular Structure and Dynamics

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“…In our calculation of the optical polarizabilities, we assume that the net polarizabilities of the fllm are equal to the sum of polarizabilities ofCsDNA and water, as has been previously done for Li-and NaDNA(2) as well as for NaHA (16). We assume an ideal mixture of the components, i.e., that the polarizabilities of the components do not change due to mixing.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of CsDNA Films as a Function of Hydration

Adams

VanSteenberg

Lee

et al. 1994

Journal of Biomolecular Structure and Dynamics

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The refractive indices of wet-spun films of CsDNA have been measured for light polarized parallel and perpendicular to the helical axis as a function of relative humidity (RH). These data have been combined with previously published data (Biopolymers 30 (1990) 877-887) for the volume per base pair and water content as a function of RH in order to extract the optical polarizabilities. This work was motivated by the study of Weidlich et al. (Biopolymers 26 (1987) 439-453) who reported a approximately 35% increase at the A-to-B transition in the parallel and perpendicular polarizabilities of NaDNA. In contrast, a much smaller increase in the polarizabilities of CsDNA is found near the A-to-B transition: approximately 12% for the perpendicular direction and < or = 4% for the parallel direction.

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Electronic and optical properties of wet‐spun films of Li‐ and Na‐hyaluronate

et al. 1994

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SYNOPSISThe uv absorption of Na-hyaluronate ( NaHA) films and the refractive indices, water content, and swelling of LiHA films have been measured as a function of relative humidity. Three peaks are observed in the uv absorption of NaHA (at about 250, 310, and 330 nm) for water content above 10 water molecules per disaccharide. The absorptivity of the 250, 310, and 330 nm peaks increase as the water content increases, indicating a change in the electronic properties of the HA molecule. The refractive indices, water content, and swelling of LiHA films are used to determine the optical polarizability via the Lorentz-Lorenz relation. The polarizability of LiHA is found to have a similar dependence on water content as NaHA, though the changes observed are larger in magnitude.

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Optical and physical properties of wet-spun films of Na-hyaluronate. Evidence of a phase transition

Cited by 13 publications

References 17 publications

Raman and Infrared Studies of Wet-Spun Films of Na-Hyaluronate

Raman and Infrared Studies of Wet-Spun Films of Na-Hyaluronate

Optical Properties of CsDNA Films as a Function of Hydration

Electronic and optical properties of wet‐spun films of Li‐ and Na‐hyaluronate

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