## 3 Results
### Pear Chromatogram Contour Plot Analysis
\begin{table}
\begin{tabular}{l l l l l l l l l l} \hline
**1\({}_{\mathrm{R}}\) (a) ** & **Compound** & **Formula** & **CAS Number** & **R1\({}_{\mathrm{C}\mathrm{H}\mathrm{O}}\)**, **b** ** & **R1\({}_{\mathrm{H}\mathrm{c}}\)** ** & **Odor Descriptor** & **Ref. [4]** \\ \hline
**Alcohols** & & & & & & & & \\
75 & 0.85 & 1-propanol & C\({}_{\mathrm{H}\mathrm{O}}\) & 71-23-8 & 590 & 591 & oxidized pear, aldehyde & [39] \\
85 & 1.04 & 2-methyl-1-propanol & C\({}_{\mathrm{H}\mathrm{O}}\) & 78-83-1 & 614 & 615 & wine & [40] \\
95 & 1.38 & **1-butanol** & C\({}_{\mathrm{H}\mathrm{O}}\) & 71-36-3 & 638 & 637 & medicinal, metallic & [6,39] \\
125 & 1.80 & **2-methyl-1-butanol** & C\({}_{\mathrm{H}\mathrm{O}}\) & 1565-80-6 & 710 & 728 & acidic, sharp, spicy & [41] \\
145 & 2.26 & **1-pentend** & C\({}_{\mathrm{H}\mathrm{O}}\) & 71-41-0 & 758 & 754 & roasted & [6] \\
230 & 1.34 & 2-methyl-2-propanol & C\({}_{\mathrm{H}\mathrm{O}}\) & 75-65 & 855 & - & - & - \\
250 & 3.43 & **1-hexanol** & C\({}_{\mathrm{H}\mathrm{O}}\) & 111-27-3 & 873 & 877 & oxidized, soups, fresh rose, fresh, grass, engine & [6,39] \\
560 & 3.56 & **2-ethyl-1-hexanol** & C\({}_{\mathrm{H}\mathrm{O}}\) & 104-76-7 & 1036 & 1026 & oily, sweet, floral & [40] \\
**Aldehydes** & & & & & & & & \\
170 & 0.91 & Hexanal & C\({}_{\mathrm{H}\mathrm{O}}\) & 66-25-1 & 804 & 801 & fruity, green & [6,40] \\
295 & 1.18 & heptanal & C\({}_{\mathrm{H}\mathrm{O}}\) & 111-71-7 & 905 & 906 & fatty & [40] \\
490 & 1.40 & octanal & C\({}_{\mathrm{H}\mathrm{O}}\) & 124-13-0 & 1006 & 1005 & fruity, orange, fresh rose, fatty & [42] \\
730 & 1.52 & monanal & C\({}_{\mathrm{H}\mathrm{O}}\) & 124-19-6 & 1104 & 1106 & orange, fresh rose, fatty & [40,42] \\
995 & 1.54 & decanal & C\({}_{\mathrm{H}\mathrm{O}}\) & 112.31-2 & 1206 & 1207 & sweet, wavy, floral, citrus, fatty & [40] \\
**Ketones** & & & & & & & & \\
115 & 2.84 & **3-hydroxy-2-butanone** & C\({}_{\mathrm{H}\mathrm{O}}\) & 513-86-0 & 689 & 697 & woody, yogurt & [40] \\
460 & 1.89 & 6-methyl-5-hepten-2-one & C\({}_{\mathrm{H}\mathrm{O}}\) & 110-93-0 & 993 & 990 & fatty, green, citrus & [40] \\
**Esters** & & & & & & & & \\
115 & 0.63 & **propyl acetate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 109-60-4 & 683 & 684 & floral, esters & [39] \\
150 & 0.71 & **2-methylpropyl acetate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 110-19-0 & 766 & 769 & pear, apple, fruity, sweet, floral & [39] \\
185 & 0.87 & **butyl acetate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 213-86-4 & 817 & 819 & fruity, pear, floral, sweet & [39,43] \\
265 & 0.93 & 2-methylbutyl acetate & C\({}_{\mathrm{H}\mathrm{O}}\) & 624-41-9 & 884 & 879 & apple peel, banana & [40] \\
295 & 0.90 & propyl botanoate & C\({}_{\mathrm{H}\mathrm{O}}\) & 105-66-8 & 905 & 900 & pineapple, apricot, rancid, sweaty & [40] \\
310 & 0.95 & butyl propionate & C\({}_{\mathrm{H}\mathrm{O}}\) & 590-1-2 & 913 & 912 & earth, swept & [40] \\
320 & 1.08 & **pentyl acetate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 628-63-7 & 918 & 919 & pear, triity, estev, sweet, candy, floral & [39] \\
475 & 1.06 & butyl botanoate & C\({}_{\mathrm{H}\mathrm{O}}\) & 109-21-7 & 1000 & 996 & pear, esters & [39] \\
490 & 1.10 & **ethyl hexanoate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 123-66-0 & 1006 & 1001 & pear, floral, fruity, estev, sweet, cooked pear, & [39] \\
520 & 1.33 & **hexyl acetate** & C\({}_{\mathrm{H}\mathrm{O}}\) & 142-92-7 & 1018 & 1024 & pear, floral, sweet, fruity, estev & [39] \\
585 & 0.95 & butyl-2-methylbutanoate & C\({}_{\mathrm{H}\mathrm{O}}\) & 15705-73-7 & 1045 & 1018 & fruity, cocoa & [40] \\
625 & 1.03 & 2-methylbutyl botanoate & C\({}_{\mathrm{H}\mathrm{O}}\) & 51115-64-1 & 1061 & - & - & - \\
715 & 1.12 & propyl hexanoate & C\({}_{\mathrm{H}\mathrm{O}}\) & 626-77-7 & 1098 & 1098 & ether, pineapple, blackberry & [40] \\
745 & 1.17 & hevely propionate & C\({}_{\mathrm{H}\mathrm{O}}\) & 2445-76-3 & 1110 & 1114 & earthly & [40] \\ \hline \end{tabular}
\end{table}