Abstract
In this study, oxygen tolerance of five photohydrogen-producing green algal species, Chlamydomonas moewusii, Chlorella fusca, Chlorella pyrenoidosa, Chlamydomonas reinhardtii and Scenedesmus obliquus, were first evaluated comparatively. These green algae varied in O2-tolerance. C. pyrenoidosa exhibited notable O2-tolerance and was investigated comparatively to that of C. reinhardtii. We used an improved O2-tolerance detection method to eliminate the effects of O2 dissolving rate. Results showed that the O2I50 values of C. pyrenoidosa cells (in vivo) and cell lysate (in vitro) were 139% and 61% higher than those of C. reinhardtii, respectively. Furthermore, owing to the higher O2-tolerance, C. pyrenoidosa cells could evolve hydrogen at a higher threshold of O2 content in the photobiological hydrogen production process and kept releasing H2 for more than 260h under continuous illumination compared to 60h in C. reinhardtii did under the same conditions.
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