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首页> 外文期刊>Astrobiology >Chemical lonization Mass Spectrometry: Applications for the In Situ Measurement of Nonvolatile Organics at Ocean Worlds
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Chemical lonization Mass Spectrometry: Applications for the In Situ Measurement of Nonvolatile Organics at Ocean Worlds

机译：化学电离质谱：海洋世界中非挥发性有机物的原位测量应用

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A new technique that has applications for the detection of nonvolatile organics on Ocean Worlds has been developed. Here, liquid mixtures of fatty acids (FAs) and/or amino acids (AAs) are introduced directly into a miniature quadrupole ion trap mass spectrometer (QITMS) developed at Jet Propulsion Laboratory and analyzed. Two ionization methods, electron impact and chemical ionization (EI and CI, respectively), are compared and contrasted. Further, multiple CI reagents are tested to explore their potential to “soften” ionization of FAs and AAs. Both EI and CI yield mass spectra that bear signatures of FAs or AAs; however, soft CI yields significantly cleaner mass spectra that are easier to interpret. The combination of soft CI with tandem mass spectrometry (MS/MS) has also been demonstrated for AAs, generating “fingerprint” mass spectra of fragments from protonated parent ions. To mimic potential Ocean World conditions, water is used as the primary collision gas in MS/MS experiments. This technique has the potential for the in situ analysis of molecules in the cryogenic plumes of Ocean Worlds (e.g., Enceladus) and comets with the ultimate goal of detecting potential biosignatures.
机译：已经开发出一种新技术，该技术可用于检测海洋世界中的非挥发性有机物。在这里，将脂肪酸（FAs）和/或氨基酸（AAs）的液体混合物直接引入到Jet Propulsion实验室开发的微型四极离子阱质谱仪（QITMS）中并进行了分析。比较和对比了两种电离方法，即电子碰撞和化学电离（分别为EI和CI）。此外，测试了多种CI试剂，以探索其“软化” FA和AA离子化的潜力。 EI和CI均可产生带有FA或AA签名的质谱图。然而，软CI产生的质谱图明显更清晰，更易于解释。还证明了软CI与串联质谱（MS / MS）的结合用于AA，可从质子化母体离子生成碎片的“指纹”质谱。为了模拟潜在的海洋世界条件，在MS / MS实验中将水用作主要的碰撞气体。该技术具有对海洋世界（例如，土卫二）的低温羽流中的分子进行原位分析的潜力，其最终目的是检测潜在的生物特征。

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