| abstract |
(57) [Problem] To provide a collagen and an aqueous composition thereof which are excellent in heat stability and do not cause a decrease in viscosity or transparency during storage, and have stable properties. The heat denaturation temperature is 40 to 47 ° C, and the heat denaturation temperature is 2 ° C at 35 ° C. A bird-derived collagen having a residual viscosity of 60% or more after storage for 4 hours and a residual transmittance of 97% or more measured at 430 nm, and an aqueous composition using the collagen. |