The aim of this work was to describe and compare the main fatty acids and biodiesel indices of some green and brown macroalgae (seaweeds) collected from the Persian Gulf, as an alternative raw material for renewable biodiesel production. The macroalgae showed low lipid content (< 10% DW) but marine macroalgae with total lipid content > 5% DW are a good source for biodiesel production. The total lipid content and saturated fatty acids (SFAs) of green algae were higher than that of brown algae, while higher accumulation of unsaturated fatty acids (USFAs) was observed in brown seaweeds. Further, the main fatty acid in all studied seaweeds was palmitic acid (C16:0), which was followed by oleic acid (C18:1). The results of this work showed that three of the green algae, especially C. sertularioides, could be a potential source of fatty acids for biodiesel production owing to their high total lipid content, high cold flow indices (long chain saturated factor, cold filter plugging point and cloud point) and a fatty acid profile rich in SFAs with a high amount of C18:1, which is suitable for oil-based bio products. In contrast, the brown seaweeds Sargassum boveanum and Sirophysalis trinodis lipid content had a high proportion of polyunsaturated fatty acids (PUFAs), which makes them suitable for replacing fish oil.

中文翻译：

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在伊朗引入大型藻类作为生物柴油的来源：总脂质含量、脂肪酸和生物柴油指数的分析

这项工作的目的是描述和比较从波斯湾收集的一些绿色和棕色大型藻类（海藻）的主要脂肪酸和生物柴油指数，作为可再生生物柴油生产的替代原料。大型藻类的脂质含量低（< 10% DW），但总脂质含量> 5% DW 的海洋大型藻类是生物柴油生产的良好来源。绿藻的总脂质含量和饱和脂肪酸（SFAs）高于褐藻，而褐藻中不饱和脂肪酸（USFAs）的积累量更高。此外，所有研究的海藻中的主要脂肪酸是棕榈酸（C16：0），其次是油酸（C18：1）。这项工作的结果表明，三种绿藻，尤其是C. sertularioides，由于其总脂质含量高、冷流指数高（长链饱和因子、冷滤点和浊点）和富含 SFA 且含量高的脂肪酸谱，可能是用于生物柴油生产的脂肪酸的潜在来源C18:1，适用于油基生物制品。相比之下，棕色海藻马尾藻和刺鳖脂质成分中多不饱和脂肪酸（PUFAs）的比例很高，这使得它们适合替代鱼油。