论文标题
ISM中脂肪醇的前体：发现N-丙醇
Precursors of fatty alcohols in the ISM: Discovery of n-propanol
论文作者
论文摘要
关于生命的起源的理论表明，早期细胞膜是从两亲性分子中合成的，比脂肪醇等磷脂更简单。最简单的磷脂头组乙醇胺的星际培养基（ISM）中的发现提出了一个问题，即在空间中是否还合成了简单的两亲分子。我们研究ISM中是否存在脂肪醇的前体。为此，我们使用IRAM 30m和Yebes 40m望远镜进行了7、3、2和1 mm的光谱调查，朝着银河系中心的巨型分子云G+0.693-0.027进行了调查。在这里，我们报告了脂肪醇的前体的原发性醇N-丙醇的ISM检测（在构象异构中GA-N-C3H7OH和AA-N-C3H7OH）。对于Ga构象异构体而言，N-丙醇的衍生列密度为（5.5+-0.4）X10^13 cm^-2，AA构象异构体的（3.4+-0.3）X10^13 cm^-2对于（4.1+-0.3）x10^-10 for Ga-n-c3h7oh和2.5+-0.2）（4.1+-0.3）的分子丰度（4.1+-0.3） AA-N-C3H7OH。我们还搜索了N-丁醇（AGA-N-C4H9OH）的AGA构象异构体，但没有成功，其丰度<4.1x10^-11。推断的CH3OH：C2H5OH：C3H7OH：C4H9OH的丰度比为1：0.04：0.006：<0.0004 to G+0.693-0.027，即它们大致减少了一个学位，以增加一个学位，以增加复杂性。我们还报告了乙烯基酒精的SYN和抗构象的检测，列密度为（1.11+-0.08）X10^14 cm^-2和（1.3+-0.4）X10^13 cm^-2，以及（8.2+-0.6）x10^-10^-10^-10^-10 and（9.6+-3.0）x10 x10 x10^-11^-11^-11^-11，分别。 N-丙醇的检测以及最近在ISM中发现乙醇胺的发现，可以从外太空中将脂质前体的前体根据生命起源的理论带到地球上。
Theories on the origins of life propose that early cell membranes were synthesized from amphiphilic molecules simpler than phospholipids such as fatty alcohols. The discovery in the interstellar medium (ISM) of ethanolamine, the simplest phospholipid head group, raises the question whether simple amphiphilic molecules are also synthesized in space. We investigate whether precursors of fatty alcohols are present in the ISM. For this, we have carried out a spectral survey at 7, 3, 2 and 1 mm toward the Giant Molecular Cloud G+0.693-0.027 located in the Galactic Center using the IRAM 30m and Yebes 40m telescopes. Here, we report the detection in the ISM of the primary alcohol n-propanol (in both conformers Ga-n-C3H7OH and Aa-n-C3H7OH), a precursor of fatty alcohols. The derived column densities of n-propanol are (5.5+-0.4)x10^13 cm^-2 for the Ga conformer and (3.4+-0.3)x10^13 cm^-2 for the Aa conformer, which imply molecular abundances of (4.1+-0.3)x10^-10 for Ga-n-C3H7OH and of (2.5+-0.2)x10^-10 for Aa-n-C3H7OH. We also searched for the AGa conformer of n-butanol (AGa-n-C4H9OH) without success yielding an upper limit to its abundance of <4.1x10^-11. The inferred CH3OH:C2H5OH:C3H7OH:C4H9OH abundance ratios go as 1:0.04:0.006:<0.0004 toward G+0.693-0.027, i.e. they decrease roughly by one order of magnitude for increasing complexity. We also report the detection of both syn and anti conformers of vinyl alcohol, with column densities of (1.11+-0.08)x10^14 cm^-2 and (1.3+-0.4)x10^13 cm^-2, and abundances of (8.2+-0.6)x10^-10 and (9.6+-3.0)x10^-11, respectively. The detection of n-propanol, together with the recent discovery of ethanolamine in the ISM, opens the possibility that precursors of lipids according to theories of the origin of life, could have been brought to Earth from outer space.
