Exploring engineering reduced graphene oxide-titanium dioxide (RGO-TiO2) nanoparticles treatment to effectively enhance lutein biosynthesis with Chlorella sorokiniana F31 under different light intensity
2022
Zhao, Xunrui | Yan, Jiangtao | Yang, Tongtong | Xiong, Pan | Zheng, Xin | Lu, Yinghua | Jing, Keju
The Chlorella sorokiniana F31 is a promising lutein producer with high lutein content. Herein, different graphene/TiO₂ nanoparticles (NPs) were designed and synthesized by hydrothermal method. Through the UV–vis diffuse reflectance spectra (DRS) analysis, the results showed that RGO-TiO₂ NPs can effectively expand visible light absorption compared with TiO₂ NPs. Subsequently, the effects of these NPs on light utilization and lutein accumulation of C. sorokiniana F31 were investigated, and the RGO-TiO₂ NPs treatment exhibited the higher lutein production and content than that of TiO₂ and control group. As the optimal RGO-TiO₂ (0.5 wt%) NPs concentration of 50 mg/L and light intensity of 211 μmol/m²/s, the supreme lutein content (15.55 mg/g), production (77.2 mg/L) and productivity (12.87 mg/L/d) were achieved. The performances are higher than most of reported values in previous study, indicated that RGO-TiO₂ (0.5 wt%) NPs treatment is a promised strategy to enhance microalgal growth and lutein accumulation.
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