Skip to main content
. Author manuscript; available in PMC: 2020 Dec 21.
Published in final edited form as: Atmos Chem Phys. 2018 Jul 23;18(14):10433–10457.

Table 2.

Oxidation products from β-caryophyllene observed in central Amazonia in gas and/or particle phases listed by analysis method. These products are attributed to oxidation from the sesquiterpene (SQTOX) source category. Synthesized standards for tracers 1–6 were used to confirm identification and for quantification.

No. Tracer name Structure Source category Analysis methods Chemical formula Molecular weight (g mol−1) UHRMS measured m/z [M-1]− UHRMS average % of total signal intensity
1 β-caryophyllene aldehyde graphic file with name nihms-1506407-t0010.jpg SQTOX SV-TAG; filter GC × GC HR-ToF-MS; filter ESI-UHRMS C15H24O2 236.35 235.17023 1.2
2 β-caryophyllonic acid graphic file with name nihms-1506407-t0011.jpg SQTOX SV-TAG; filter GC × GC HR-ToF-MS; filter ESI-UHRMS C15H24O3 252.35 251.1652 0.74
3 β-nocaryophyllone aldehyde graphic file with name nihms-1506407-t0012.jpg SQTOX Filter GC × GC HR-ToF-MS; filter ESI-UHRMS C14H22O3 238.32 237.14943 0.37
4 β-nocaryophyllonic acid graphic file with name nihms-1506407-t0013.jpg SQTOX Filter UHPLC-MS; filter ESI-UHRMS C14H22O4 254.32 253.14448 0.81
5 β-caryophyllinic acid graphic file with name nihms-1506407-t0014.jpg SQTOX Filter UHPLC-MS; filter ESI-UHRMS C14H22O4 254.32 253.14448 0.81
6 β-nocaryophyllinic acid graphic file with name nihms-1506407-t0015.jpg SQTOX Filter ESI-UHRMS C13H20O5 256.29 255.12378 0.69
7 DCCA or 3,3-dimethyl-2-(3-oxobutyl)-cyclobutanecarboxylic acid graphic file with name nihms-1506407-t0016.jpg SQTOX Filter ESI-UHRMS C11H18O3 198.26 197.11828 1.25
8 2-(2-carboxyethyl)-3,3-dimethylcyclo-butanecarboxylic acid graphic file with name nihms-1506407-t0017.jpg SQTOX Filter ESI-UHRMS C10H16O4 200.23 199.09755 1.36