Abstract

Algal lipids are being used extensively for the production of environment-friendly biofuels nowadays. However, quantity and quality of the extracted lipids are key prerequisites for the production of quality biofuels. The current study was carried out to analyze biomass productivity, lipid content and fatty acid profile of a pre-characterized oleaginous microalgal species (Scenedesmus dimorphus) raised under mixotrophic conditions using apple-pomace hydrolysate as additional source of carbon and energy. The above-mentioned parameters were compared for the microalgal biomass raised under mixotrophic as well as photoautotrophic conditions to justify the need of the study. Mixotrophic cultivation yielded significantly higher biomass productivity (140.37 mg L⁻¹ d⁻¹) than that of photoautotrophic cultivation (96.55 mg L⁻¹ d⁻¹). Lipids’ content (w/w) was also significantly higher for the biomass raised mixotrophically (41%) as compared to that raised photoautotrophically (28%). Lipidome depicted higher concentrations of polyunsaturated fatty acids (palmitic and oleic acids). The frequent availability of polyunsaturated fatty acids (64 mg g⁻¹ of dried biomass) in the lipid contents of algal biomass raised mixotrophically may ensure the production of high-quality biofuel. Our findings of the present study will be fruitful to top up the biofuel balance by the exploited utility of oleaginous microalgal biomass raised under mixotrophic conditions.

Graphic Abstract

中文翻译：

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混合营养栽培of草（Scendesmus dimorphus），以提高生物量生产力和脂质产量

摘要

如今，藻类脂质已被广泛用于生产环保型生物燃料。但是，提取脂质的数量和质量是生产优质生物燃料的关键先决条件。当前的研究进行了分析，在混合营养条件下使用苹果果渣水解物作为碳和能量的附加来源，培养了预先表征的含油微藻种（Scendesmus dimorphus）的生物量生产力，脂质含量和脂肪酸谱。对上述参数进行了混合营养和光合自养条件下产生的微藻生物量的比较，以证明需要进行研究。混合营养栽培可显着提高生物量生产力（140.37 mg L ^-1 d ^-1）比光养植物（96.55 mg L ^-1 d ^-1）与光养养生的生物质相比，混养养生的生物质（41％）的脂质含量（w / w）也明显更高。脂质组描绘了更高浓度的多不饱和脂肪酸（棕榈酸和油酸）。混合营养增加的藻类生物质的脂质含量中多不饱和脂肪酸（干燥生物质的64 mg g ^-1）的频繁供应可确保生产高质量的生物燃料。我们在本研究中的发现将有助于通过利用在混合营养条件下产生的油质微藻生物质来补充生物燃料的平衡。

图形摘要