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Table 1 Chemical composition of the essential oils of Plectranthus cylindraceus (A), P. asirensis (B) and P. barbatus (C)

From: Phytochemical analysis and evaluation of the cytotoxic, antimicrobial and antioxidant activities of essential oils from three Plectranthus species grown in Saudi Arabia

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   9.7 22.1 57.8  
Oxygenated monoterpenes   11.1 10.1 31.2  
Sesquiterpene hydrocarbons   7.1 36.1 1.6  
Oxygenated sesquiterpenes   60.8 25.6 6.4  
Other compounds   0.3 1.1 0.1  
Total   89.0 95.0 97.1  
  1. Boldface means major compounds (compounds with high content or high persentage)
  2. RRI Relative retention indices calculated against n-alkanes. %; calculated from the FID chromatograms, tr Trace (< 0.1%); Identification method: tR, identification based on the retention times (tR) of genuine compounds on the HP Innowax column; MS, identified on the basis of computer matching of the mass spectra with those of the Wiley and MassFinder libraries and comparison with literature data