摘要
The fatty acid compositions of four species of marine diatoms (Chaetoceros gracilis MACC/B13, Cylindrotheca fusiformis MACC/B211, Phaeodactylum tricornutum MACC/B221 and Nitzschia closterium MACC/B222), cultivated at 22 ℃± 1 ℃ with the salinity of 28 in f/2 medium and harvested in the exponential growth phase, the early stationary phase and the late stationary phase, were determined. The results showed that growth phase has significant effect on most fatty acid contents in the four species of marine diatoms. The proportions of 16:0 and 16:1n-7 fatty acids increased while those of 16:3n-4 and eicosapentaenoic acid (EPA) decreased with increasing culture age in all species studied. The subtotal of saturated fatty acids (SFA) increased with the increasing culture age in all species with the exception of B13. The subtotal of monounsaturated fatty acids (MUFA) increased while that of polyunsaturated fatty acids (PUFA) decreased with culture age in the four species of marine diatoms. MUFA reached their lowest value in the exponential growth phase, whereas PUFA reached their highest value in the same phase.
The fatty acid compositions of four species of marine diatoms (Chaetocerosgracilis MACC/B13, Cylindrotheca fusiformis MACC/B211, Phaeodactylum tricornutum MACC/B221 andNitzschia closterium MACC/B222), cultivated at 22℃ ±1℃ with the salinity of 28 in f/2 medium andharvested in the exponential growth phase, the early stationary phase and the late stationary phase,were determined. The results showed that growth phase has significant effect on most fatty acidcontents in the four species of marine diatoms. The proportions of 16:0 and 16:1 n-7 fatty acidsincreased while those of 16:3n-4 and eicosapentaenoic acid (EPA) decreased with increasing cultureage in all species studied. The subtotal of saturated fatty acids (SFA) increased with theincreasing culture age in all species with the exception of B13. The subtotal of mo-nounsaturatedfatty acids (MUFA) increased while that of polyunsaturated fatty acids (PUFA) decreased with cultureage in the four species of marine diatoms. MUFA reached their lowest value in the exponentialgrowth phase, whereas PUFA reached their highest value in the same phase.
基金
supported by the National High Teeh 863 Project of China(863-819-02-01).
