GC-MS analysis of long chain alkyl diols and hydroxy alkenoates in surface sediment from the Northwest Pacific off the coast of Sanriku and culture samples of diatom Proboscia alata (Supplementary Information)

Long-chain (C₂₈, C₃₀, and C₃₂) alkyl diols (LCD) in marine sediments are considered to originate from marine diatom genus Proboscia and Eustigmatophytes. LCD has been proposed as a proxy for upwelling, riverine input and sea surface temperature, but has not yet been applied much to palaeoceanographic studies. Long-chain (C₂₇ and C₂₉) hydroxy alkenoates such as 12-hydroxy methyl alkanoate (MA) were found in marine sediments and also derived from diatom Proboscia. In this study, we analyzed LCD and 12-OH MA in surface sediment from the Northwest Pacific off the coast of Sanriku and Proboscia alata culture sample. We identified monosaturated and saturated 1,13-, 1,14-, and 1,15-diols, as well as saturated 12-OH MA.