Accumulation of Extracellular Non-volatile Organic Acids in Batch Cultures of Chlorella vulgaris and Microcystis aeruginosa

Abstract

The accumulation processes of non-volatile organic acids were investigated in pure batch cultures of Chlorella vulgaris cultivated in the Chu medium and Microcystis aeruginosa cultivated in the Chu and MA medium, respectively.
Glycolic and oxalic acids accumulated in the culture of Chlorella vulgaris. The former acid mainly accumulated in the logarithmic growth phase, while the latter acid accumulated in the decrease phase.
The glycolic acid was the significant non-volatile organic acid in the culture of Microcystis aeruginosa, and accumulations of pyruvic, fumaric, oxalic and lactic acids were also determined at the end of experiment. However, these organic acids did not accumulated in the logarithmic growth phase of Microcystis aeruginosa cultivated in the MA medium with organic compounds.