Abstract
Cyanobacteria can have high lipid content, are amenable to metabolic engineering, and contain valuable materials, such as ultraviolet (UV) protectants and antioxidants. Maximizing the production and harvesting of several valuable products at the same time is an important objective. UV exposure was evaluated as a strategy to induce synthesis of UV protectants, higher lipid productivity, and a high lipid-saturation index in the cyanobacterium Lyngbya purpurem UTEX LB 2716. While UVA stimulated the highest production of lipids and the largest amount of mycosporine-like amino acids (MAAs), UVB lead to greater generation of MAAs, which correlated to higher antioxidant activity. UVB also showed a shift towards saturated fatty acids, such as C16:0 and C18:0, over unsaturated fatty acids, whereas UVA showed a shift towards the unsaturated fatty acids. In summary, UVB induced the highest MAAs production, anti-oxidant activity, and lipid saturation, and its yield of crude lipids and extracted FAME was only slightly lower than with UVA.
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