The process of free and bound water release was manifested as a peak on the electrical conductivity–temperature curve between 320 – 350 K. FSC revealed higher electrical conductivity, than BAT collagen. The water release was followed by the decrease in electrical conductivity for both materials and it appeared in the same temperature range for both, FSC and BAT collagen. The maximum at 454 K for FSC and at 487 K for BAT is related to thermal denaturation. The change in electrical conductivity is characteristic of transformation from semiconducting materials to dielectric materials.