Skip to main content
. Author manuscript; available in PMC: 2020 May 18.
Published in final edited form as: Geobiology. 2019 Dec 21;18(3):326–347. doi: 10.1111/gbi.12378

FIGURE 8.

FIGURE 8

MRM-GC-MS (M+→217 Da) chromatograms of the extractable (free) C26–C30 steranes from sample v12 (Visingsö Group, Broken Nodule). There are at least four detectable “regular” sterane series (each with αααS, αββR, αββS, αααR isomers). 21-nor = 21-norcholestane; 27-nor = 27-norcholestane; E = ergostane; C = cryostane. Cross talk (x) peaks from hopanes are dominant in the C30 (414→217 Da) chromatogram since C30 sterane abundances are trace/absent for Visingsö samples