عنوان مقاله [English]
Fatty acids profile of phytoplankton was studied in the spring and summer in the Caspian Sea in 1394, in order to evaluate seasonal changes. Sampling was performed in three repetitions, for each season (noshahr area). The volume of water that filtered by filtration device was about 25 liters. The profile of fatty acids for samples were obtained by GC/mass. The results that were related to the profile of fatty acids in the spring and summer showed that the overall percentage of saturated fatty acids (SFA) were %54.5 and %32.3, respectively. Mono unsaturated fatty acids (MUFA) were %30.22 and %37.39 and poly unsaturated fatty acids (PUFA) were %15.31 and %16.67, respectively. It was observed that SFA in the spring, MUFA and PUFA in the summer showed high levels. Some of the essential fatty acids such as Omega-3 (EPA and DHA) that play a main role in the food chain and human health increased in the summer. Statistical analysis suggested that there was no significant difference between spring and summer for total fatty acid groups, but some important fatty acids, such as Palmitic acid, Oleic acid and DHA, showed significant difference between two seasons.