Fig. 1
Identification of 2-deoxyribose in ice photolysis residues. a Single-ion monitoring (SIM) chromatograms of residues produced from the UV irradiation of H2O:CH3OH (2:1) (12C sample, m/z = 195 Da) and H2O:13CH3OH (2:1) (13C sample, 200 Da) ice mixtures after derivatization with (+)-2-butanol/TFAA. The peaks around 57.0 and 57.3 min in both chromatograms are tentatively assigned to 2-deoxyxylose (see Supplementary Fig. 2). Intensities are offset for clarity. b From top to bottom, mass spectra of the peaks assigned to 2-deoxy-L-ribose in the regular residue, the 13C-labeled residue, and a standard of 2-deoxyribose. The molecular structure of 2-deoxyribose is shown without derivatization. Assignments of the fragments in the mass spectra can be found in Supplementary Table 1
