Characterization and optimization of carbohydrate production from an indigenous microalga Chlorella vulgaris FSP-E

► An indigenous C. vulgaris FSP-E isolate exhibits high potential as sugar producer. ► Microalgal growth is improved by properly adjusting light intensity and inoculum size. ► Nitrogen starvation is very effective in promoting carbohydrate accumulation. ► The carbohydrate profile of the microalga is suitable for bioethanol fermentation.