Species discrimination using pyGC-MS. Left panel: Venn diagram showing the compound overlap between three algal strains. Right panel: Multivariate principal component analysis using the SpectConnect output matrix of intensities of detected components. Vector 1 discriminates Chlamydomonas (red) from Botryococcus strains, explaining most of the variance in the data set. Vector 3 comprises only 6.7% of the total variance but clearly distinguishes the Botryococcus braunii race A (blue) from race B samples (black).
Barupal et al. BMC Biotechnology 2010 10:40 doi:10.1186/1472-6750-10-40