Diffusion NMR as a new method for the determination of the gel point of gelatin

Article Abstract:

The sol-gel transition of the thermoreversible gelling system of gelatin is studied by using dynamic light scattering (DLS), oscillatory shear rheology, and the diffusion NMR spectroscopy. NMR diffusion measurements have revealed the gel point as a minimum when the apparent diffusion coefficients are plotted vs. temperature and hence it can be used as a simple means to detect the critical threshold in both directions of temperature variation.

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Hydrogen exchange and hydration dynamics in gelatin gels

Article Abstract:

The water [2.super.H] and [17.super.O] magnetic relaxation dispersion (MRD) profiles from gelatin gels over wide ranges of resonance frequency and pH are reported. The MRD analysis shows a highly mobile hydration layer at the surface of the gelatin triple helix and a small number of trapped water molecules with residence times on the order of [10.sup.-8]s, presumably associated with structural defects and branch points in the gel.

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Self-association of lysozyme as seen by magnetic relaxation dispersion

Article Abstract:

The pH and salt dependent self-association of hen egg-white lysozyme (HEWL) is studied extensively, mainly by scattering techniques. The findings of the study help to explain why HEWL tends to form amorphous precipitates in the presence of sulfate and why crystallization of HEWL is facilitated by sulfobetaine.

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