초록
<P><B>Abstract</B></P> <P>As the current bioconversion of lignocellulose mainly towards on bioenergy, a bioproduct with higher value would be promising to improve the profit output from the process. Straw lignocellulose, hydrothermally pretreated by ammonium sulfite, was used as the substrate to produce high-value microalgal biomass in this study. Medium based on the lignocellulose hydrolysate were prepared to cultivate four locally isolated microalgal strains, <I>Chlorella</I> and <I>Scenedesmus</I> species. All of the microalgal strains well adapted to the lignocellulose hydrolysate. Among the strains, <I>C</I>. ZTY4 had the highest growth rate in hydrolysate-based medium with a generation time of only 10.2 h, which was much shorter than that in glucose medium (16.7 h) and former reports. The polyunsaturated fatty acids (PUFA) content of <I>C</I>. ZTY4 reached to 66.4% in total fatty acids of <I>C</I>. ZTY4, which was well qualified for high-value applications. <I>C</I>. ZTY4 was identified as <I>Chlorella pyrenoidosa</I> by 18S rDNA sequencing. This research proposed a bioconversion approach from straw lignocellulose to high-value microalgal biomass and screened <I>C</I>. ZTY4 as a qualified strain.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Straw lignocellulose pretreated by ammonium sulfite was hydrolyzed as substrate. </LI> <LI> Growth kinetics of <I>Chlorella pyrenoidosa</I> in straw hydrolysate was clarified. </LI> <LI> Hydrolysate stimulated growth at low concentration and inhibited at high. </LI> <LI> Han-Levenspiel model was well fit to explain the growth in hydrolysate medium. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>