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Microalgae are among the few biological resources studied that are found to possess vast biotechnological potential. This study isolated, identified and investigated two wild green microalgal species with substantial potential as a bioresource and climate change mitigation importance. Two isolates,  Chlorella sorokiniana  and  Tetradesmus reginae  were cultivated in selected artificial media under laboratory conditions. The isolates were analysed for nutrient consumption, biomass productivity, CO 2  biosequestration rate, elemental composition and fatty acid methyl profiles/composition. The outcome showed maximum daily biomass productivity of 0.128 ± 0.003 and 0.2 ± 0.004 g L −1  for  C. sorokiniana  and  T. reginae , respectively. CO 2  biosequestration rate of  T. reginae  was the highest among the isolates, indicating that it can act as a biological climate change mitigation agent. Moreover,  T. reginae  recorded a significantly higher ( p  &lt; 0.05) total lipid and carbohydrate content than  C. sorokiniana . The C/N ratio for  T. reginae  was significantly higher than the C/N ratio for  C. sorokiniana .  Tetradesmus reginae  also demonstrated the ability to produce a considerable quantity of omega-3 oils; hence, the species is of nutraceutical importance. Furthermore,  T. reginae  demonstrated maximal carbohydrate content and is therefore considered a potential feedstock for bioethanol production.  Chlorella sorokiniana , on the other hand, showed a remarkable ( p  &lt; 0.05) protein content making it a potential source for human food and animal feed supplement. Finally, the two isolates met both European and American quality biodiesel standards with exceptional cetane (CN) and iodine numbers (IV).

biomass conversion and biorefinery

Bioprospecting wild South African microalgae as a potential third-generation biofuel feedstock, biological carbon-capture agent and for nutraceutical applications