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Journal of Applied Phycology

, Volume 27, Issue 1, pp 187–196 | Cite as

Dark fermentative hydrogen production by the unicellular halotolerant cyanobacterium Aphanothece halophytica grown in seawater

  • Samart Taikhao
  • Aran IncharoensakdiEmail author
  • Saranya PhunpruchEmail author
Article

Abstract

Biohydrogen is an environmentally friendly alternative energy carrier that can be produced by a number of different microorganisms. The unicellular halotolerant cyanobacterium Aphanothece halophytica is one of the high potential H2 producers. Under dark fermentation, it is capable of producing H2 by the bidirectional hydrogenase activity via the catabolism of glycogen stored during photosynthesis. This work aimed to cultivate A. halophytica in natural seawater containing high salinity and minerals, with an addition of some essential nutrients, and to investigate effects of various nutritional and physical factors on its dark fermentative H2 production. A. halophytica was able to grow in natural seawater added with NaNO3. Cells grown in seawater supplemented with as little as 1.76 mM NaNO3 showed similar growth to those cultivated in normal BG11 supplemented with Turk Island salt solution. H2 production was the highest when incubating the cells in seawater without any supplementation of NaNO3. Under this condition, the highest rate of dark fermentative H2 production of 82.79 ± 3.47 nmol H2  mg-1 dry weight h−1 was found in cells incubated at 35 °C, pH 6 with the supplementation of 378 mmolC L−1 glucose, 0.25 M NaCl, and 0.4 μM Fe3+. Long-term H2 accumulation of 1,864 ± 81 nmol H2  mg−1 dry weight was observed after 8 days of dark incubation under anoxic condition, and the high yield of H2 was sustained at least up to 14 days, suggesting the possibility of utilizing natural seawater to grow A. halophytica for long-term production of H2.

Keywords

Hydrogen production Aphanothece halophytica Natural seawater 

Notes

Acknowledgments

This study was financially supported by research grant from the Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang and the Commission on Higher Education (CHE), Thailand (The university staff development consortium). S. Taikhao is also thankful to the Strategic Scholarships for Frontier Research Network for the Ph.D. program provided by CHE. A. Incharoensakdi thanks the CHE and the Ratchadaphiseksomphot Endowment Fund of Chulalongkorn University, for the National Research University Project grant (FW0659A), and the Chulalongkorn University Centenary Academic Development Project grant (RES560530052-FW), respectively.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Biology, Faculty of ScienceKing Mongkut’s Institute of Technology LadkrabangBangkokThailand
  2. 2.Laboratory of Cyanobacterial Biotechnology, Department of Biochemistry, Faculty of ScienceChulalongkorn UniversityBangkokThailand

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