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Analytical and Bioanalytical Chemistry

, Volume 400, Issue 1, pp 245–253 | Cite as

Culturing and investigation of stress-induced lipid accumulation in microalgae using a microfluidic device

  • Ryan E. Holcomb
  • Lucas J. Mason
  • Kenneth F. Reardon
  • Donald M. Cropek
  • Charles S. HenryEmail author
Original Paper

Abstract

There is increasing interest in using microalgae as a lipid feedstock for the production of biofuels. Lipids used for these purposes are triacylglycerols that can be converted to fatty acid methyl esters (biodiesel) or decarboxylated to “green diesel.” Lipid accumulation in most microalgal species is dependent on environmental stress and culturing conditions, and these conditions are currently optimized using slow, labor-intensive screening processes. Increasing the screening throughput would help reduce the development cost and time to commercial production. Here, we demonstrated an initial step towards this goal in the development of a glass/poly(dimethylsiloxane) (PDMS) microfluidic device capable of screening microalgal culturing and stress conditions. The device contained power-free valves to isolate microalgae in a microfluidic growth chamber for culturing and stress experiments. Initial experiments involved determining the biocompatibility and culturing capability of the device using the microalga Tetraselmis chuii. With this device, T. chuii could be successfully cultured for up to 3 weeks on-chip. Following these experiments, the device was used to investigate lipid accumulation in the microalga Neochloris oleabundans. It was shown that this microalga could be stressed to accumulate cytosolic lipids in a microfluidic environment, as evidenced with fluorescence lipid staining. This work represents the first example of microalgal culturing in a microfluidic device and signifies an important expansion of microfluidics into the biofuels research arena.

Keywords

Microalgae Microfluidics Valves Lipids Biofuels Cell culturing 

Notes

Acknowledgements

The authors thank Tara D. Schumacher for providing microalgae samples, culturing media, and relevant information regarding microalgal culturing. Additionally, the authors thank James T. Palmer for his rendering of Fig. 1a. Finally, the authors would like to thank Joshua M. Stillahn for his assistance in conducting profilometry measurements. This work was jointly funded by the US Army Corps of Engineers 6.2 Applied Research Program and the Sustainable Bioenergy Development Center at Colorado State University (Grant 09-01) through contract DE-FG02-08ER64622 from the Department of Energy.

Supplementary material

216_2011_4710_MOESM1_ESM.pdf (24 kb)
ESM 1 (PDF 23.6 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ryan E. Holcomb
    • 1
  • Lucas J. Mason
    • 1
  • Kenneth F. Reardon
    • 2
  • Donald M. Cropek
    • 3
  • Charles S. Henry
    • 1
    • 2
    Email author
  1. 1.Department of ChemistryColorado State UniversityFort CollinsUSA
  2. 2.Department of Chemical and Biological EngineeringColorado State UniversityFort CollinsUSA
  3. 3.US Army Engineer Research and Development Center, Construction Engineering Research Laboratory (CERL)ChampaignUSA

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