Fig. 6

Average percentage changes of the selected fatty acids in intact cells. PCA results, obtained by the analysis of the FTIR spectra of intact cells, are summarized as percentage changes averaged across the three ranges (\(\tilde{\Updelta }\left( {K_{144h;0h} ,S} \right),\) see “Methods” section for details), for R. toruloides, L. starkeyi, C. curvatus grown on pure glycerol (left panel) and crude glycerol (right panel). The larger the value, the more a lipid standard contributes to the spectral profile changes of the sample at 144 h compared to the time 0. In addition, the average (across range) value of the gas chromatographic (GC) data is shown scaled in the range 0–100 for comparison. Error bars indicate the bootstrapped 95 % confidence intervals