The effect of pressure on the sol-gel transition of sodium deoxycholate (SDC) solutions was investigated by the electric conductivity method up to 2000 atm in the temperature range from 10 to 65 °C. The gelation of SDC solutions is effected more easily at lower temperatures, at higher pressures, and at higher concentrations of SDC. The changes in the volume (Δ(αβ)), the enthalpy (Δ(αβ)), and the entropy (Δ(αβ)) of gelation were calculated thermodynamically. The values for Δ(αβ), Δ(αβ), and Δ(αβ) are all negative under the conditions of this experiment. Therefore, it is concluded that the gel formation of SDC is attributable to intermolecular hydrogen bonds.
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Sugihara et al. (1977) studied this question.
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