Table 1 Opposite handedness of the enantiomeric excess (ee) induced in racemic isovaline films in asymmetric photolysis experiments by 192 nm left (l-) and right circularly polarized light (r-CPL) confirms the predictions by the anisotropy spectra

From: Uncovering the chiral bias of meteoritic isovaline through asymmetric photochemistry

Sample set

CPL helicity

Irradiation time

Number of replicate GC×GC injections, nirr /nnon-irr

%eeL ± SD

Two-sample t test, p-value (two-tailed)

%eeL predicteda at ξ = 0.9999

I

l-CPL

14 h

9 / 16

−2.05 ± 1.05

4.8 × 10−6

≤−0.6%

II

l-CPL

9 h 35 min

9 / 9

−1.02 ± 0.85

2.3 × 10−3

 

III

r-CPL

8 h 15 min

9 / 10

1.89 ± 1.08

4.1 × 10−5

≥0.6%

IV

r-CPL

6 h 30 min

9 / 9

1.27 ± 0.51

1.4 × 10−6

 
  1. aBased on the g values of the l-enantiomer of isovaline using the equation reported by Kagan et al.31. The l-enantiomer was selected due to its higher purity compared to the d-enantiomer (see Methods).
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