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A sensitive quantitative analysis of abiotically synthesized short homopeptides using ultraperformance liquid chromatography and time-of-flight mass spectrometry.
Journal of Chromatography A ( IF 4.1 ) Pub Date : 2020-08-23 , DOI: 10.1016/j.chroma.2020.461509
Eric T Parker 1 , Megha Karki 2 , Daniel P Glavin 1 , Jason P Dworkin 1 , Ramanarayanan Krishnamurthy 2
Affiliation  

In the origins of life field understanding the abiotic polymerization of simple organic monomers (e.g., amino acids) into larger biomolecules (e.g., oligopeptides), remains a seminal challenge. Recently, preliminary observations showed a limited set of peptides formed in the presence of the plausible prebiotic phosphorylating agent, diamidophosphate (DAP), highlighting the need for an analytical tool to critically evaluate the ability of DAP to induce oligomerization of simple organics under aqueous conditions. However, performing accurate and precise, targeted analyses of short oligopeptides remains a distinct challenge in the analytical chemistry field. Here, we developed a new technique to detect and quantitate amino acids and their homopeptides in a single run using ultraperformance liquid chromatography-fluorescence detection/time of flight mass spectrometry. Over an 8-minute retention time window, 18 target analytes were identified and quantitated, 16 of which were chromatographically separated at, or near baseline resolution. Compound identity was confirmed by accurate mass analysis using a 10 ppm mass tolerance window. This method featured limits of detection < 5 nM (< 1 fmol on column) and limits of quantitation (LOQs) <15 nM (< 3 fmol on column). The LODs and LOQs were upwards of ∼28x and ∼788x lower, respectively, than previous methods for the same analytes, highlighting the quantifiable advantages of this new method. Both detectors provided good quantitative linearity (R2 > 0.985) for all analytes spanning concentration ranges ∼3 - 4 orders of magnitude. We performed a series of laboratory experiments to investigate DAP-mediated oligomerization of amino acids and peptides and analyzed experimental products with the new method. DAP readily polymerized amino acids and peptides under a range of simulated environmental conditions. This research underscores the potential of DAP to have generated oligopeptides on the primordial Earth, enhancing prebiotic chemical diversity and complexity at or near the origin of life.



中文翻译:

使用超高效液相色谱和飞行时间质谱对非生物合成的短多肽进行灵敏的定量分析。

在生命领域的起源中,将简单的有机单体(例如氨基酸)非生物聚合成较大的生物分子(例如寡肽)仍然是一项重大挑战。最近,初步观察表明,在可能的益生元磷酸化试剂二氨基磷酸酯(DAP)存在下形成的肽组有限,这突出表明需要一种分析工具来严格评估DAP在水性条件下诱导简单有机物低聚的能力。然而,对短寡肽进行精确,有针对性的分析仍然是分析化学领域的一项独特挑战。这里,我们开发了一种使用超高效液相色谱-荧光检测/飞行时间质谱技术在一次运行中检测和定量氨基酸及其同系肽的新技术。在8分钟的保留时间范围内,鉴定并定量了18种目标分析物,其中16种以色谱分离度达到或接近基线分辨率。通过使用10 ppm质量公差窗口的精确质量分析来确认化合物的身份。该方法的特征是检测限<5 nM(色谱柱上<1 fmol)和定量限(LOQ)<15 nM(色谱柱上<3 fmol)。对于相同的分析物,检出限和检出限分别比以前的方法低约28倍和约788倍,突出了这种新方法的可量化优势。两种检测器均提供了良好的定量线性(R 其中有16种色谱分离度为或接近基线分辨率。通过使用10 ppm质量公差窗口的精确质量分析来确认化合物的身份。该方法的特征是检测限<5 nM(色谱柱上<1 fmol)和定量限(LOQ)<15 nM(色谱柱上<3 fmol)。对于相同的分析物,检出限和检出限分别比以前的方法低约28倍和约788倍,突出了这种新方法的可量化优势。两种检测器均提供了良好的定量线性(R 其中有16种色谱分离度为或接近基线分辨率。通过使用10 ppm质量公差窗口的精确质量分析来确认化合物的身份。该方法的特征是检测限<5 nM(色谱柱上<1 fmol)和定量限(LOQ)<15 nM(色谱柱上<3 fmol)。对于相同的分析物,检出限和检出限分别比以前的方法低约28倍和约788倍,突出了这种新方法的可量化优势。两种检测器均提供了良好的定量线性(R 对于相同的分析物,检出限和检出限分别比以前的方法低约28倍和约788倍,突出了这种新方法的定量优势。两种检测器均提供了良好的定量线性(R 对于相同的分析物,检出限和检出限分别比以前的方法低约28倍和约788倍,突出了这种新方法的可量化优势。两种检测器均提供了良好的定量线性(R2 > 0.985),适用于所有浓度范围约为3-4个数量级的分析物。我们进行了一系列实验室实验,以研究DAP介导的氨基酸和肽的寡聚化,并用新方法分析了实验产物。DAP可以在一系列模拟环境条件下轻松聚合氨基酸和多肽。这项研究强调了DAP在原始地球上生成寡肽的潜力,从而增强了生命起源或接近生命起源的益生元化学多样性和复杂性。

更新日期:2020-09-12
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