Fatty acid methyl ester profiles and nutritive values of 20 marine microalgae in Korea

ABSTRACT

Objective:To screen the fatty acid (FA) composition of 20 marine microalgae species, including sevenDiophyceae, sixBacillariophyceae, fourChlorophyceae, twoHaptophyceae and oneRaphidophyceae species.Methods: Microalgal cells cultured at the Korea Institute of Ocean Science & Technology were harvested during the late exponential growth phase and the FA composition analyzed.Results:The FA composition of microalgae was species-specific. For example, seven different species ofDinophyceae were composed primarily of C140, C160, C180, C204n-6, C205n-3 and C226n-3, while C140, C160, C161, C180, C205n-3 and C226n-3 were abundant FAs in six species ofBacillariophyceae. In addition, fourChlorophyceae, twoHaptophyceae and oneRaphidophyceae species all contained a high degree of C161n-7 [(9.28-34.91)% and (34.48-35.04)%], C140 [(13.34-25.96)%] and [(26.69-28.24)%], and C160 [(5.89-29.15)%] and [(5.70-16.81)%]. Several factors contribute to the nutritional value of microalgae, including the polyunsaturated FA content and n-3 to n-6 FA ratio, which could be used to assess the nutritional quality of microalgae.Conclusions:This study is the first comprehensive assessment of the FA composition and nutritional value of microalgae species in South Korea, and identifies the potential utility of FAs as species-specific biomarkers.