HighlightsMicroalgae are source of valuable compounds as lipids, proteins, carbohydrates, pigments among others.Culture stress conditions increase biomass and high values compounds in microalgae.Nitrogen and salt stress increase lipids in microalgae.Two stages culture and electromagnetic fields enhancing microalgae biomass and pigments content.

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BACKGROUND: This work compared the production of Chlorella vulgaris biomass and pigments (chlorophylls and carotenoids) in photoautotrophic, photoheterotrophic and two-stage photoheterotrophic-photoautotrophic cultures in two types of photobioreactors, a flat-panel airlift (FPA) and a conventional stirred tank (STR) system. RESULTS: The biomass and pigments productivities of photoheterotrophic and photoheterotrophic-photoautotrophic cultureswere much greater than the productivity of photoautotrophic culture in the FPA. The 3.9-fold higher average shear rate values in the FPA relative to the STR affected the size of the algal cells, but not the final biomass concentration. The two-stage photoheterotrophic-photoautotrophic culture in the FPA had nearly 48% higher biomass productivity than the photoheterotrophic culture in the same device but offered no advantage in terms of production of the pigments. CONCLUSIONS:The FPA and the STR offer very different culture environments which affect an algal culture; a two-stage culture was more productive in biomass than a photoautotrophic culture but not for pigments production.Viscosity of the culture broth max Maximum specific growth rate L Density of the culture broth * Correspondence to: J Montañez,

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