Abstract:

The fatty acid compositions of Andrias davidianus oil were analysed with gas chromatography/mass spectrometry (GC-MS); meanwhile the viscosity and the shear stress of the oil and its mixture with peanut oil at various ratios (75:25, 50:50, 25:75) were measured with rheometer. GC-MS results showed that there werer totally 12 fatty acids in Andrias davidianus oil with their contents as follows: C18:1 24.55%, C16:1 16.40%, C16:0 15.64%, C18:2 8.28%, C20:5 6.74%, C18:3 5.48%, C22:6 4.27%, C14:0 3.00%, C18:0 2.87%, C17:0 2.47%, C22:5 2.64%, C20:4 2.71%. And there were 23.98% of saturated fatty acids (SFA) and 76.58% of unsaturated fatty acids(UFA), in which the propotion of monounsaturated fatty acids(MFA) was 45.47%, and that of polyunsaturated fatty acids(PUFA) was 31.11% with the UFA/SFA ratio at 3.19:1, and the propotion of ω-3 PUFA was 20.85%, and the propotion of ω-6 PUFA was 10.26%. Rheological analysis showed that viscosity of oil consisting of 50% Andrias davidianus oil and 50% peanut oil decreased significantly, and exhibited properties of Newtonian fluid. The results suggested that Andrias davidianus oil was a nutritional oil with probable healthy functions.

Key words: Andrias davidianus oil, fatty acid compositions, GC-MS, rheological properties