Abstract

This study highlights freshwater oleaginous microalgae as efficient vectors for development of eco-friendly environmental solutions. An effective hybrid approach has been presented here for cadmium tolerance complementing with enhanced lipid productivity in four freshwater oleaginous microalgae viz., Chlorella singularis, Chlorella sorokiniana, Chlorella minutissima and Scenedesmus abundans that can be utilized for bioremediation as well as biofuel generation. All the microalgae displayed considerable resistance to cadmium under in-vitro culture conditions. The identified microalgae presented here can be used for both, Cd contaminated wastewater treatments as well as lipid reservoirs for biofuel production as indicated by their cadmium optimum growth concentration and Maximum Tolerable Concentration (MTC). The biomass and lipid accumulation was not inhibited by Cd, instead it increased under the influence of lower concentrations of cadmium. However, very high concentrations of Cd (>300 mg/L) inhibited both biomass and lipid yield. A decrease in all the photosynthetic pigments was recorded in the presence of Cadmium (Cd) at various concentrations. The GC–MS based lipid profiles indicated the dominance of SAFA and MUFA under the stress of Cd.

摘要

这项研究强调淡水含油微藻是开发生态友好型环境解决方案的有效载体。一个有效的混合方法已经被这里介绍的镉耐性增强，脂质的生产能力四个淡水含油微藻补充即，小球藻辛格拉里斯，小球藻sorokiniana，小球藻minutissima和绿藻量丰度可用于生物修复和生物燃料生产。所有微藻在体外培养条件下都表现出相当大的镉抗性。此处介绍的已识别微藻可用于镉污染的废水处理以及用于生物燃料生产的脂质水库，如其镉最佳生长浓度和最大耐受浓度 (MTC) 所示。生物量和脂质积累不受镉的抑制，而是在较低浓度镉的影响下增加。然而，非常高浓度的 Cd (>300 mg/L) 抑制了生物量和脂质产量。在不同浓度的镉 (Cd) 存在下，所有光合色素均减少。