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Brillouin spectroscopy was used to probe the viscoelastic properties of anatural gastropod mucus at GHz frequencies over the range -11 $^\circ$C $\leq T\leq$ 52 $^\circ$C. Anomalies in the temperature dependence of mucuslongitudinal acoustic mode peak parameters and associated viscoelasticproperties at $T = -2.5^\circ$C, together with the appearance of a peak due toice at this temperature, suggest that the mucus undergoes a phase transitionfrom a viscous liquid state to one in which liquid mucus and solid ice phasescoexist. Failure of this transition to proceed to completion even at -11$^\circ$C is attributed to glycoprotein-water interaction. The temperaturedependence of the viscoelastic properties and the phase behaviour suggest thatwater molecules bind to glycoprotein at a temperature above the onset offreezing and that the reduced ability of this bound water to take on aconfiguration that facilitates freezing is responsible for the observedfreezing point depression and gradual nature of the liquid-solid transition.

Temperature Dependence of the Viscoelastic Properties of a Natural Gastropod Mucus by Brillouin Light Scattering Spectroscopy