Samples of soft coral Sinularia flexibilis were collected in February, May, August, November in Nha Trang, Khanh Hoa. The content of molecular species in phosphatidylethanolamine class in the lipid of obtained coral samples has been determined. Identified 14 types of PE molecule species, in which the alkenylacyl PE 18:1e/20:4 has the highest concentration, ranging from 51.35% to 63.16% in 4 samples, the highest and lowest concentrations were in a sample collected in August and November, respectively. Samples collected in August and May have a lower diacyl PE ratio than samples collected in November and February. This study identified the lowest alkylacyl and the highest alkenylacyl concentration in a sample collected in August. The fatty acids present in this class are 17:1, 18:1, 18:2, 19:1, 20:4, and 24:5. The percentage of the total content of molecule species by each fatty acid is similar between months. The total content of molecule species containing 20:4n fatty acids was 80.08–84.27% of the PE class, and the difference was not significant in 4 coral samples. There was an inverse correlation between the total content of molecule species containing 20:4n PUFA and the total content of 20:4n fatty acid and the proportional correlation between the content of PE molecule species containing 24:5n PUFA content of 24:5n fatty acid in total fatty acids.
The samples of soft coral Sinularia flexibilis were collected from January to December in one year from Nha Trang, Khanh Hoa coastal. Initial assessment the month-by-month fluctuation of total lipid content and lipid classes composition in this species was conducted. Total lipid content reached the highest value during March to May, lower in the period of June-September and bottomed in October and November. There was a significant decrease in this content between May and June; September and October; the content increase from February to March but not stable during October to February. The lipid classes composition of Sinularia flexibilis includes polar lipids (PL), sterols (ST); triacylglycerol (TAG), monoalkyldiacyl-glycerol (MADAG), wax (W) and free fatty acids (FFA). The concentration of PL in summer (April-August) was lower than that in winter (September-February), this content increased significantly during November-December meanwhile it was observed to decrease in April-May, December-January. The content of ST increased from October to March and declined from April to September. The remain classes including W, MADAG, TAG tend to increase in the summer period and decline in the other months. The fluctuation of lipid classes composition throughout the year is closely related to the presence of zooxanthellae microalgae in corals at different times of the year and is directly influenced by environmental conditions, especially sea water temperature. In addition, the effect of maturation and reproduction of this coral with the increase or release of reproductive materials also observed.
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