Table 1 Chemical composition of the essential oils of Plectranthus cylindraceus (A), P. asirensis (B) and P. barbatus (C)
No. | Compounds | RRI | A % | B % | C % | Identification |
|---|---|---|---|---|---|---|
1 | α-Pinene | 1032 | 0.2 | 8.6 | 46.2 | tR, MS |
2 | α -Thujene | 1035 | tr | 5.9 | – | MS |
3 | α-Fenchene | 1072 | – | – | tr | tR, MS |
4 | Camphene | 1076 | 0.2 | 0.1 | 4.5 | tR, MS |
5 | β-Pinene | 1118 | 0.1 | 1.9 | 3.3 | tR, MS |
6 | Sabinene | 1132 | 0.1 | 1.5 | – | tR, MS |
7 | Thuja-2,4 (10)-diene | 1138 | – | tr | 0.2 | MS |
8 | δ-3-Carene | 1159 | tr | – | – | tR, MS |
9 | Myrcene | 1174 | 0.1 | 1.3 | 0.5 | tR, MS |
10 | α-Terpinene | 1188 | 2.3 | 0.4 | – | tR, MS |
11 | Limonene | 1203 | 0.2 | 0.2 | 1.8 | tR, MS |
12 | 1,8-Cineole | 1213 | – | – | 2.7 | tR, MS |
14 | β-Phellandrene | 1214 | 0.4 | tr | – | tR, MS |
15 | p-mentha-1, 3, 6-triene | 1215 | – | tr | – | MS |
16 | cis-Anhydrolinalool oxide | 1220 | tr | – | – | MS |
17 | (Z)-3-Hexenal | 1225 | – | tr | – | tR, MS |
18 | (Z)-β-Ocimene | 1246 | – | tr | – | tR, MS |
19 | γ-Terpinene | 1255 | 0.3 | 1.0 | 0.1 | tR, MS |
20 | (E)-β-Ocimene | 1266 | – | 0.8 | – | tR, MS |
21 | p-Cymene | 1280 | 5.5 | 0.4 | 1.1 | tR, MS |
22 | Terpinolene | 1290 | tr | 0.5 | 0.1 | tR, MS |
23 | (Z)-3-Hexenol | 1391 | – | 0.3 | – | tR, MS |
24 | 3-Octanol | 1393 | 0.1 | tr | – | MS |
25 | α-Thujone | 1438 | – | tr | – | MS |
26 | p-Cymenene | 1452 | 0.1 | tr | 0.1 | MS |
29 | β-Thujone | 1457 | – | 0.1 | – | MS |
30 | 1-Octen-3-ol | 1459 | 0.2 | 0.5 | 0.1 | tR, MS |
31 | trans-Sabinene hydrate | 1474 | 0.1 | – | – | tR, MS |
32 | cis-Linalool oxide (Fur.) | 1479 | tr | – | – | MS |
33 | Bicycloelemene | 1495 | – | tr | – | MS |
34 | α-Copaene | 1497 | 0.1 | 0.2 | 0.7 | MS |
35 | Camphor | 1532 | 7.2 | – | 0.3 | tR, MS |
36 | β-Bourbonene | 1535 | tr | 0.3 | tr | tR, MS |
37 | α-Gurjunene | 1544 | 0.1 | – | – | MS |
38 | cis-α-Bergamotene | 1550 | tr | – | – | MS |
39 | Linalool | 1553 | 2.3 | 1.3 | 0.5 | tR, MS |
40 | cis-Sabinene hydrate | 1556 | 0.1 | – | – | tR, MS |
41 | α-Bergamotene | 1577 | 0.2 | 0.3 | – | MS |
42 | Pinocarvone | 1586 | tr | – | 0.1 | MS |
44 | Aristolene | 1589 | tr | – | – | tR, MS |
45 | Bornyl acetate | 1590 | – | 0.2 | 2.3 | tR, MS |
46 | β-Elemene | 1600 | 0.1 | tr | – | MS |
47 | Calarene | 1610 | 1.2 | – | – | tR, MS |
48 | Terpinen-4-ol | 1611 | 0.8 | 3.3 | 1.4 | tR, MS |
49 | β-Caryophyllene | 1612 | 1.3 | 13.3 | 0.5 | tR, MS |
50 | Aromadendrene | 1628 | – | 0.4 | – | MS |
51 | Selina-5,11-diene | 1634 | tr | – | – | MS |
52 | trans-p-Menth-2,8-dien-1-ol | 1638 | 0.1 | – | – | MS |
53 | Myrtenal | 1648 | – | 1.2 | 0.2 | MS |
55 | Sesquisabinene | 1660 | 0.6 | 0.3 | – | tR, MS |
56 | Alloaromadendrene | 1661 | 0.1 | 4.4 | – | MS |
57 | trans-Pinocarveol | 1664 | – | 0.8 | 0.9 | tR, MS |
58 | cis-Verbenol | 1667 | – | – | 0.1 | Ms |
59 | (Z)-β-Farnesene | 1668 | – | tr | – | MS |
60 | α-Humulene | 1687 | 0.1 | 1.0 | 0.2 | tR, MS |
61 | trans-Verbenol | 1690 | – | – | 0.6 | MS |
62 | δ-Selinene | 1700 | 0.1 | – | – | MS |
63 | α-Terpineol | 1706 | 0.1 | 0.8 | 2.0 | tR, MS |
64 | Borneol | 1719 | 0.1 | 2.1 | 20.7 | tR, MS |
65 | Germacrene D | 1726 | 0.5 | 2.0 | – | MS |
66 | β-Selinene | 1742 | 1.0 | – | – | MS |
67 | α-Selinene | 1744 | tr | – | – | MS |
68 | Sesquicineole | 1747 | 5.3 | – | – | MS |
69 | p-Mentha-1,5-dien-8-ol | 1747 | – | 0.5 | 0.6 | MS |
70 | Bicyclogermacrene | 1751 | 0.8 | 7.4 | – | MS |
71 | δ-Cadinene | 1772 | – | 0.5 | – | tR, MS |
72 | γ-Cadinene | 1776 | 0.2 |  |  | MS |
73 | (E)- α-Bisabolene | 1786 | 0.1 | – | – | MS |
74 | Myrtenol | 1796 | – | 2.6 | 1.1 | MS |
75 | α-Cadinene | 1811 | – | – | 0.2 | MS |
76 | cis-Calamenene | 1853 | 0.5 | – | – |  |
77 | p-Cymen-8-ol | 1864 | – | – | 0.2 | tR, MS |
78 | Ascaridole | 1889 | 0.4 | – | – | MS |
79 | trans-Sesquisabinene hydrate | 2000 | 0.2 | 5.2 | – | MS |
80 | Isocaryophyllene oxide | 2001 | – | 0.2 | – | MS |
81 | Caryophyllene oxide | 2008 | 0.8 | 4.7 | 0.8 | tR, MS |
82 | Maaliol | 2012 | 42.8 | 0.2 | – | MS |
83 | (E)-Nerolidol | 2041 | – | 0.8 | – | tR, MS |
84 | Humulene epoxide-II | 2071 | – | 0.4 | 0.7 | MS |
85 | 1, 10-diepi- Cubenol | 2080 | 0.4 | – | – | MS |
86 | Globulol | 2096 | 1.1 | 0.5 | – | MS |
87 | cis-Sesquisabinene hydrate | 2097 | – | 0.8 | – | MS |
88 | Cumin alcohol | 2113 | 0.1 | – | – | tR, MS |
89 | Rosifoliol | 2122 | 0.2 | – | – | MS |
90 | Spathulenol | 2144 | 3.3 | 8.7 | – | tR, MS |
91 | Cedrol | 2148 | – | – | 4.0 | MS |
92 | β-Bisabolol | 2170 | – | 2.0 | – | MS |
93 | T-Cadinol | 2191 | 1.3 | – | 0.3 | MS |
94 | Valerenal | 2194 | 3.2 | – | – | MS |
95 | α-Bisabolol | 2232 | 1.6 | – | – | MS |
96 | trans-α-Bergamotol | 2241 | – | 1.5 | – | MS |
97 | β-Eudesmol | 2255 | – | 2.2 | 0.6 | MS |
98 | Intermedeol | 2260 | – | – | tr | MS |
99 | Selina-11-en-4α-ol | 2273 | – | – | tr | MS |
100 | Caryophylladienol I | 2316 | 0.1 | 0.1 | – | MS |
101 | Caryophylladienol II | 2324 | 0.6 | 0.3 | tr | MS |
102 | Caryophyllenol I | 2353 | – | – | tr | MS |
103 | Caryophyllenol II | 2392 | – | 0.4 | tr | MS |
104 | Phytol | 2622 | – | 0.2 | tr | MS |
105 | Heptacosane | 2700 | – | 0.1 | – | MS |
106 | Hexadecanoic acid | 2931 | – | tr | – | MS |
Monoterpene hydrocarbons | Â | 9.7 | 22.1 | 57.8 | Â | |
Oxygenated monoterpenes | Â | 11.1 | 10.1 | 31.2 | Â | |
Sesquiterpene hydrocarbons | Â | 7.1 | 36.1 | 1.6 | Â | |
Oxygenated sesquiterpenes | Â | 60.8 | 25.6 | 6.4 | Â | |
Other compounds | Â | 0.3 | 1.1 | 0.1 | Â | |
Total | Â | 89.0 | 95.0 | 97.1 | Â |