Peak      No. a  RI b Compounds Formula % Area c A B C Hydrocarbons 1 1031 α-Pinene C10H16 2.27 2.15 0.36 2 1078 Camphene C10H16 0.07 0.05 0.07 3 1121 β-Pinene C10H16 13.57 13.04 3.36 4 1166 β-Myrcene C10H16 1.40 1.24 0.08 5 1189 p-Menthane C10H20 0.28 0.13 0.23 6 1213 Limonene C10H16 57.71 61.22 19.02 7 1255 3-Carene C10H16 10.54 10.09 NA 8 1278 p-Cymene C10H14 2.92 2.26 6.66 9 1292 Terpinolene C10H16 0.59 0.59 0.27 15 1599 α-Bergamotene C15H24 0.72 0.42 NA 20 1746 α-Bisabolene C15H24 0.81 0.31 NA 22 1786 β-Bisabolene C15H24 0.16 0.29 NA 28 1146 β-Terpinene C10H16 NA NA 0.66 31 1607 β-Bergamotene C15H24 NA NA 1.54 Oxides 12 1459 cis-Limonene oxide C10H16O 0.18 0.10 2.84 13 1471 trans-Limonene oxide C10H16O 0.20 0.18 3.23 24 2003 cis-Caryophyllene oxide C15H24O 0.13 0.07 NA 40 2007 trans-Caryophyllene oxide C15H24O NA NA 2.06 Alcohols 14 1538 β-Linalool C10H18O 0.23 0.21 0.64 17 1698 α-Terpieol C10H18O 0.52 0.43 1.39 23 1839 trans-Geraniol C10H18O 0.07 0.08 NA 25 2182 (-)-Spathulenol C15H24O 0.18 0.15 NA 27 2284 α-Bisabolol C15H26O 0.11 0.06 NA 32 1624 cis-Mentha-2,8-dien-1-ol C10H16O NA NA 1.32 34 1657 trans-Pinocarveol C10H16O NA NA 1.43 35 1665 trans-Mentha-2,8-dien-1-ol C10H16O NA NA 1.38 37 1788 Myrtenol C10H16O NA NA 2.44 38 1832 trans-Carveol C10H16O NA NA 3.81 39 1863 cis-Carveol C10H16O NA NA 2.04 41 2140 Cuminol C10H14O NA NA 0.26 42 2166 trans-p-Mentha-2,8-dienol C10H16O NA NA 0.27 43 2182 (+)-Spathulenol C15H24O NA NA 0.68 44 2333 Limonen-1,2-diol C10H18O2 NA NA 7.19 Aldehydes 11 1398 Nonanal C9H18O 0.08 0.11 0.24 16 1687 cis-Citral (Neral) C10H16O 1.72 1.20 1.56 19 1735 trans-Citral (Gernial) C10H16O 2.91 1.64 1.94 33 1641 Myrtenal C10H14O NA NA 1.10 Ketones 10 1339 Sulcatone C8H14O 0.03 0.02 0.12 29 1583 Camphenilone C9H14O NA NA 0.94 30 1595 (+)-Nopinone C9H14O NA NA 0.57 36 1747 Carvone C10H14O NA NA 6.23 Acids 26 2218 Nonanoic acid C9H18O2 0.05 0.06 NA 45 2412 Geranic acid C10H16O2 NA NA 3.91 Esters 18 1726 cis-Geranyl acetate C12H20O2 0.64 0.69 3.71 21 1756 trans-Geranyl acetate C12H20O2 0.72 0.98 3.40 Unknowns 1.20 2.25 13.09

a Peak number labeled on TIC b Retention index relative to C8-C20 n-alkanes on Rtx®-Wax column cA: control sample; B: 2hr sunlight treated sample; C:  H2O added and sunlight treated 2hr sample

Table 1: Chemical compositional changes and relative intensity (%) of lemon EO in photosensitive experiment analysis by GC-MS.