Abstract
Biohydrogen (H2) production by green algae has great biotechnological potential. This study aimed to analyze photosynthetic pigment levels, photosynthetic systems activity, total phenolic/flavonoid content, and H2 generation in Chlorella vulgaris IBCE C-19 and Parachlorella kessleri MDC6524 in response to sulfur (S) and nitrogen (N) deprivation. The results showed that S and N deficiency caused a growth rate decrease in both cultures that was accompanied by a decrease in the photosynthetic pigments levels, PS II activity, and polyphenols synthesis. In addition, S and N deprivation led to an increase in the H2 generation. Moreover, the H2 photoproduction by P. kessleri was higher compared to that of C. vulgaris under N- and S-deprived anaerobic conditions. DCMU inhibited the H2 production by both algae showing the involvement of PS II in this process. The findings contribute to the ongoing research on the development of strategies to optimize algae cultivation for enhanced H2 yield.
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