for which no standard for quanti- fication is available. By analyzing the m/z of the compound, together with the elution profile and the MS2 fragmentation pattern of the found peaks, postulates can be made about the nature of the monosaccharides that are present.
For all the algae investigated, at least one unknown peak was identified by mass spectrometry, though some of them in trace amounts. Chromatograms are available in the Supplementary Information. Based on their m/z, elution pattern and mass fragmentation, postulations were done in a similar manner as above