Table 1
Selected molecules from this work compared to Murchison SOM in terms of (relative) sum abundances of functional groups.
| Species | SOM conc. (ppm) | SOM rel. to acids | 67P est. abundance | 67P rel. to acids |
|---|---|---|---|---|
| Carboxylic acids | >300 | 1 | 142 | 1 |
| Hydroxycarboxylic acids | 15 | 0.05 | xxx(b) | xxx(b) |
| Dicarboxylic acids and hydroxydicarboxylic acids | 14 | 0.05 | xxx(b) | xxx(b) |
| Esters linear | – | – | 59 | 0.42 |
| Esters cyclic/lactones(c) | – | – | 78 | 0.55 |
| Aldehydes | 27 | 0.09 | 516 | 3.63 |
| Ketones | 217 | 1.52 | ||
| Alcohols | 11 | 0.04 | 223 | 1.57 |
| Polyols | >8 | 0.03 | 76 | 0.53 |
| Ethers linear | – | – | 83 | 0.58 |
| Ethers cyclic(a) | – | – | 191 | 1.34 |
| Peroxides | – | – | 4 | 0.03 |
Notes. (a)Murchison SOM has been reviewed in Botta & Bada (2002) and Alexander et al. (2017) and literature cited therein. Here, we consider the values listed in Table 1 in Alexander et al. (2017). (b)Expected M signals of hydroxy-, di-, and hydroxydicarboxylic acids seem to be absent or below DFMS detections limits, which is indicated by XXX.(c)Cyclic esters and ethers are so-called O-bearing heterocycles.
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