作为生物化学与非生物化学的区分器的HOMO-LUMO差距
Roman Abrosimov1, Bernd Moosmann1,2
1Evolutionary Biochemistry and Redox Medicine, Institute for Pathobiochemistry, University Medical Center of the Johannes Gutenberg University, 55128 Mainz, Germany.
Life (Basel, Switzerland)
|October 26, 2024
概括
科学家建议使用最高占成的分子轨道-最低不占用的分子轨道间隙 (HOMO-LUMO间隙) 来识别外星生命. 水友分子中较小的空隙可能表明生物起源.
科学领域:
- 天体生物学 天体生物学
- 量子化学 是一个量子化学.
- 有机地化学 有机地化学
背景情况:
- 低分子质量的有机化学物质是外星生命的潜在生物标志.
- 将生物分子与非生物的有机分子区分开来一直是一项挑战.
- 最高占用分子轨道 - 最低不占用分子轨道间隙 (HOMO-LUMO间隙) 是一种与化学反应相关的量子化学性质.
研究的目的:
- 评估最高占成的分子轨道-最低不占用的分子轨道间隙 (HLG) 作为确定生命的新型代理.
- 评估HLG在区分生物和非生物有机分子中的实用性.
主要方法:
- 分析了来自石的134个无生物有机分子和570个生物分子 (微生物和植物二次代谢物) 的HLG.
- 生物和非生物化合物集之间的平均HLG比较.
- 研究了HLG和水友性 (XlogP) 的关系,以改善化合物分离.
主要成果:
- 与非生物分子 (-12.4 ± 1.6 eV) 相比,生物分子的平均HLG显著较窄 (-10.4 ± 0.9 eV).
- 专注于水友分子 (XlogP < 2) 增强了生物化合物与非生物化合物的分离.
- 一个"性反应性"象限 (RRHLG <11.25 eV和XlogP <2) 主要由生物化合物占据.
结论:
- 具有较小的高占用分子轨道-最低不占用分子轨道间隙的含水性分子是生物活动的有希望的指标.
- 这项研究提供了一种新的方法来检测地球之外的潜在生命.
- 讨论了这一推断的进化可信性.
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