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Analytical and Bioanalytical Chemistry

, Volume 407, Issue 13, pp 3799–3816 | Cite as

Determination of lipid content of oleaginous microalgal biomass by NMR spectroscopic and GC–MS techniques

  • Amarijt S. SarpalEmail author
  • Claudia M. L. L. Teixeira
  • Paulo R. M. Silva
  • Gustavo M. Lima
  • Samantha R. Silva
  • Thays V. Monteiro
  • Valnei S. Cunha
  • Romeu J. Daroda
Research Paper

Abstract

Direct methods based on 1H NMR spectroscopic techniques have been developed for the determination of neutral lipids (triglycerides and free fatty acids) and polar lipids (glyceroglycolipids/phospholipids) in the solvent extracts of oleaginous microalgal biomasses cultivated on a laboratory scale with two species in different media. The chemical shift assignments observed in the 1H and 13C NMR spectra corresponding to unsaturated (C18:N, N = 1–3, C20:3, C20:5, C22:6, epoxy) and saturated (C14–C18) fatty acid ester components in a complex matrix involving overlapped resonances have been unambiguously confirmed by the application of 2D NMR spectroscopy (total correlation spectroscopy and heteronuclear single quantum coherence–total correlation spectroscopy). The study of the effect of a polar lipid matrix on the determination of neutral lipids by an internal reference blending process by a systematic designed experimental protocol has provided absolute quantification. The fatty acid composition of algal extracts was found to be similar to that of vegetable oils containing saturated (C16–C18:0) and unsaturated (C18:N, N = 1–3, C20:N, N = 3–4, C22:6) fatty acids as confirmed by NMR spectroscopy and gas chromatography–mass spectrometry analyses. The NMR methods developed offer great potential for rapid screening of algal strains for generation of algal biomass with the desired lipid content, quality, and potential for biodiesel and value-added polyunsaturated fatty acids in view of the cost economics of the overall cost of generation of the biomass.

Graphical Abstract

500 MHz full 1H-13C 2D HSQC-TOCSY contour plot of algae extract SNDSPSClMe. b, a= C18:3, C22:6; c, e= epoxy ester; n= C22:6; q= absence of C20:5; f, g= OCH2 (sn1, sn3) and h= OCH (sn2)

Keywords

1H and 13C NMR Algal biomass solvent extracts Neutral lipids Triglycerides Biofuel Fatty acids 

Notes

Acknowledgments

We sincerely thank INMETRO, Brazil, for conducting this research, which is of national importance to Brazil in view of the development of fuels from sustainable resources. We are thank the Instituto Nacional de Tecnologia for collaboration in the project. We also express our thanks and gratitude to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the grant of a fellowship.

Supplementary material

216_2015_8613_MOESM1_ESM.pdf (137 kb)
ESM 1 (PDF 136 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Amarijt S. Sarpal
    • 1
    Email author
  • Claudia M. L. L. Teixeira
    • 2
  • Paulo R. M. Silva
    • 1
  • Gustavo M. Lima
    • 2
  • Samantha R. Silva
    • 1
  • Thays V. Monteiro
    • 1
  • Valnei S. Cunha
    • 1
  • Romeu J. Daroda
    • 1
  1. 1.Instituto Nacional de Metrologia, Qualidade e Tecnologia—INMETROXerém, Duque de CaxiasBrazil
  2. 2.Instituto Nacional de TecnologiaRio de JaneiroBrazil

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