Long-chain alkyl diol proxies and their applications in GC-MS analysis

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.

海洋沉积物中的长链（C28、C30和C32）烷基二醇（LCD）被认为是源自海洋硅藻属Proboscia和Eustigmatophytes。LCD被提议作为上升流、河流输入和海面温度的代用指标，但尚未广泛应用于古海洋学研究。在海洋沉积物中发现了长链（C27和C29）羟基烯酮酸，如12-羟基甲基烷酸（MA），这些物质亦源自硅藻Proboscia。在本研究中，我们分析了西北太平洋沿岸外Sanriku地区的表层沉积物中的LCD和12-OH MA，以及Proboscia alata培养样本。我们鉴定了单不饱和和饱和的1,13-、1,14-和1,15-二醇，以及饱和的12-OH MA。