Table 2.

Volatile compounds characteristic of beer samples. For each volatile compound aromatic note, calculated and tabulated LRIs and references are reported.

Peak Number	Identification	Aromatic Note	LRI Calc.	LRI Litt.	Reference
1	Ethyl acetate	Ethereal, fruity	850	855	[8]
2	Ethyl butyrate	Apple	1032	1037	[16]
3	Butyl acetate	Pear	1068	1075	[13]
4	Hexanal	Herbal	1078	1085	[13]
5	Isobutyl isobutyrate	Fruity	1082	1092	[38]
6	Isobutyl alcohol	Ethereal	1100	1108	[14]
7	Isoamyl acetate	Fruity, banana	1115	1121	[14]
8	Myrcene	Peppery, terpenic	1149	1164	[16]
9	Isoamyl propionate	Fruity	1183	1192	[39]
10	2-Methylbutyl isobutyrate	Fruity	1190	1199	[21]
11	Isoamyl alcohol	Alcoholic, whiskey	1210	1217	[15]
12	Ethyl caproate	Fruity	1231	1240	[15]
13	Hexyl acetate	Fruit, herb	1270	1281	[15]
14	2-Heptenal	Green	1322	1333	[17]
15	Ethyl heptanoate	Fruity, pineapple	1328	1327	[21]
16	Non-identified compound deriving from hop used as bittering agent	Herbal	1330
17	Sulcatone	Citrus	1335	1338	[13]
18	Hexanol	Herbal	1349	1344	[18]
19	3-Hexenol	Green, grassy, melon	1381	1387	[40]
20	2-Nonanone	Fruity	1387	1395	[17]
21	Nonanal	Aldehydic	1390	1396	[14]
22	2-Hexenol	Leaf, green	1402	1410	[19]
23	Butyl caproate	Fruity, pineapple, apple	1407	1407	[13]
24	Hexyl butyrate	Green	1411	1406	[18]
25	Hexyl n-valerate	Fruity	1422	1498	[21]
26	Ethyl octanoate	Waxy	1433	1443	[16]
27	1-Octen-3-ol	Earthy	1445	1455	[17]
28	Heptanol	Mushroom	1451	1460	[14]
29	Isoamyl caprote	Fruity	1454	1464	[21]
30	Sulcatol	Green	1459	1461	[21]
31	Furfural	Bready, caramel	1467	1475	[16]
32	2-Ethyl-1-hexanol	Citrus	1483	1475	[16]
33	Decanal	Orange peel	1492	1507	[16]
34	2-Nonanol	Fresh, cucumber	1514	1528	[21]
35	Benzaldehyde	Fruity, almond	1524	1526	[15]
36	Ethyl nonanoate	Waxy	1531	1528	[39]
37	Linalool	Floral	1543	1547	[8]
38	Octanol	Waxy	1553	1567	[15]
39	Hexyl caproate	Green	1606	1606	[18]
40	2-Decanol		1613	1621	[21]
41	Capric acid, ethyl ester	Waxy	1633	1654	[16]
42	Phenyl acetaldehyde	Green, honey	1642	1671	[41]
43	α-Caryophyllene	Spicy	1660	1680	[42]
44	Ethyl-9-decenoate	Fruity	1685	1697	[24]
45	Methyl geranate	Floral, green, fruity	1690	1686	[21]
46	Dihydroterpineol	Pine	1692
47	2-Undecanol	Waxy	1712	1706	[21]
48	α-Farnesene (E, E)	Sweet, wood	1744	1740	[25]
49	Decanol	Fatty	1755	1774	[16]
50	Citronellol	Floral, rose	1760	1779	[16]
51	Cis-geraniol	Sweet, floral, fruity, rose	1794	1788	[8]
52	2,4-Decadienal/2-phenylethyl acetate	Seaweed/floral	1807
53	Ethyl laurate	Waxy	1835	1867	[16]
54	trans-Geraniol	Sweet, floral, fruity	1840	1845	[8]
55	Geranyl acetone	Magnolia, green	1849	1867	[21]
56	Benzyl alcohol	Sweet, floral	1875	1876	[15]
57	Phenylethyl alcohol	Floral	1909	1931	[14]
58	Caprylic acid	Fatty	2074	2098	[41]
59	Eugenol	Spicy	2151	2157	[8]