Abstract
The effects of growth phase on the lipid content and surface properties of oleaginous microalgae Botryococcus sp. FACGB-762, Chlorella sp. XJ-445 and Desmodesmus bijugatus XJ-231 were investigated in this study. The results showed that throughout the growth phases, the lipid content of microalgae increased. The surface properties like particle size, the degree of hydrophobicity, and the total concentration of functional groups increased while net surface zeta potential decreased. The results suggested that the growth stage had significant influence not only on the lipid content but also on the surface characteristics. Moreover, the lipid content was significantly positively related to the concentration of hydroxyl functional groups in spite of algal strains or growth phases. These results provided a basis for further studies on the refinery process using oleaginous microalgae for biofuel production.
Highlights
Oil-accumulating microalgae are regarding as promising feedstocks for biodiesel production and have drawn a lot of attentions in recent decades [1]
XJ-445 and Desmodesmus bijugatus XJ-231 were gifted by prof
XJ-445 and D. bijugatus XJ-231, which was regarded as the active growth phase
Summary
Oil-accumulating microalgae are regarding as promising feedstocks for biodiesel production and have drawn a lot of attentions in recent decades [1]. The efficiencies of both mass cultivation and harvesting of microalgal cells are much influenced by the physico-chemical surface properties [3, 4]. To improve microalgal biomass productivity in photo-bioreactors (PBRs), new strategies should be adopted to avoid biofouling, which is caused by the attachment of cells to the walls of PBRs. Biofilm would lower biomass productivity by preventing effective light penetration into the suspension, and making algal biomass attach to PBR walls inaccessible for harvesting [3, 5]. Microalgal biofilm formed on the surface of the material allows an attached cultivation mode instead of suspended cultivation of microalgae for metabolite production, which has gained many attentions in recent years [5, 6].
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