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<p><i>Desmodesmus</i> is a fast-growing photosynthetic microalga and is considered a promising feedstock due to its potential to produce protein, polysaccharides, and unsaturated fatty acids. However, the economic viability of bio-based products from microalgae depends on reducing the cost of cultivation. Some microalgae species can utilize low-cost agro-industrial and urban wastes to grow and produce desirable bioproducts. The objective of this study was to evaluate the ability of the freshwater microalga <i>Desmodesmus</i> sp. strain to utilize xylose and sugarcane bagasse hydrolysate as carbon sources to grow and accumulate oil, starch, and proteins. The effects of different growth conditions, including photoautotrophic, mixotrophic, and heterotrophic growth, were investigated. The productivity data obtained with xylose indicates that <i>Desmodesmus</i> sp. has an industrial profile for all targeted biobased contents under mixotrophic culture conditions. When grown on dilute sugarcane bagasse hydrolysate, the <i>Desmodesmus</i> sp. strain produced 47.6%, 5.0%, and 10.1% of protein, starch, and oil, respectively, based on its dry cell mass. This work demonstrated that the <i>Desmodesmus</i> strain evaluated could utilize xylose as the sole carbon source and utilize the sugars, including xylose, glucose, and arabinose, present in sugarcane bagasse hydrolysate, a potential co-product of second-generation ethanol plants in Brazil.</p>

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Evaluation of Xylose Assimilation by a Strain of Desmodesmus sp. and the use of Sugarcane Bagasse Hydrolysate as a Carbon Source for Algal Biomass Production

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Marina Lemos Sartori,
  • Lílian de Araújo Pantoja,
  • Alexandre Soares dos Santos

摘要

Desmodesmus is a fast-growing photosynthetic microalga and is considered a promising feedstock due to its potential to produce protein, polysaccharides, and unsaturated fatty acids. However, the economic viability of bio-based products from microalgae depends on reducing the cost of cultivation. Some microalgae species can utilize low-cost agro-industrial and urban wastes to grow and produce desirable bioproducts. The objective of this study was to evaluate the ability of the freshwater microalga Desmodesmus sp. strain to utilize xylose and sugarcane bagasse hydrolysate as carbon sources to grow and accumulate oil, starch, and proteins. The effects of different growth conditions, including photoautotrophic, mixotrophic, and heterotrophic growth, were investigated. The productivity data obtained with xylose indicates that Desmodesmus sp. has an industrial profile for all targeted biobased contents under mixotrophic culture conditions. When grown on dilute sugarcane bagasse hydrolysate, the Desmodesmus sp. strain produced 47.6%, 5.0%, and 10.1% of protein, starch, and oil, respectively, based on its dry cell mass. This work demonstrated that the Desmodesmus strain evaluated could utilize xylose as the sole carbon source and utilize the sugars, including xylose, glucose, and arabinose, present in sugarcane bagasse hydrolysate, a potential co-product of second-generation ethanol plants in Brazil.