Table 2 Ratios of the geometry factor for three amino acids (in %) to that of alanine in this model compared to the equivalent ratios of ees found in the meteoric samples with the most aqueous alteration (CI1), the least aqueous alteration (CR3), and an intermediate amount of aqueous alteration (CM2)12.

From: Amino Acid Chiral Selection Via Weak Interactions in Stellar Environments: Implications for the Origin of Life

 

Ligand

Zwitterion

Optimized Cation

CI1

CM2

CR3

Isovaline

0.16

−0.06

2.20

1.92 (0.16)

2.45 (0.16)

0.05 (0.14)

Norvaline

−1.42

0.83

0.20

0.45 (0.17)

0.0 (0.14)

0.05 (0.14)

Aspartic Acid*

−2.90

0.37

0.60

0.12 (0.17)

2.00 (0.15)

−0.10 (0.15)

Glutamic Acid*

−0.24

0.52

0.73

3.38 (0.17)

2.45 (0.17)

−0.10 (0.18)

  1. Values in parentheses are uncertainties estimated from computed error propagation from the uncertainties provided with the original data.
  2. *Optimized zwitterion geometries used in place of the optimized cation.
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