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Table 1 Relative percentages of constituents and extraction yields of EOs from A. sativum, A. cepa bulbs, D. gossweileri stem barks and P. brazzeana roots

From: Chemical composition, in vitro antioxidant and anti-inflammatory properties of essential oils of four dietary and medicinal plants from Cameroon

Components RI Relative percentage (%)
A. cepa A. sativum D. gossweileri P. brazzeana
2,4-dimethylthiophene 884 - 0.63 0.03 -
Diallyl sulfide 888 1.38 7.10 0.11 -
2,5-dimethyl thiophene 908 0.82 -   -
Allyl methyl disulfide 918 - - 0.01 -
Methyl propyl disulfide 922 - 1.19 - -
N,N’-Dimethyl thiourea 951 - - 0.01 -
Benzaldehyde 962 - - 0.28 -
dimethyl trisulfide 964 - 0.58 - -
2-Phenyl furan 978 - 0.48 - -
Octyl aldehyde 990 2.26 - - -
phenylacetaldehyde 1026 2.69 - 0.06 -
Limonene 1029 - 0.62 - -
2-propenyl propyl disulfide 1032 5.15 0.20 0.02 -
2,5-dimethyl-1,3,4-thiadiazole 1037 - 0.74 - -
Terpinolene 1059 - - 0.02 -
Phenylmethanol 1081 - - 0.01 -
Diallyl disulfide 1088 - 19.74   -
Trans-propenyl propyl disulfide 1091 2.86 - - -
Linalool 1101 - 0.88 - -
Dipropyl disulfide 1109 2.71 0.62 - -
1-propenyl propyl disulfide 1114 3.77 - - -
3,5-dimethyl-1,2,4-trithiolane 1118 1.81 - - -
Campholenol 1124 - - 0.03 0.31
Allyl methyl trisulfide 1149 - 12.95 - -
Methyl propyl trisulfide 1153 8.14 - - -
Benzylcyanide 1157 2.52 - 35.72 0.86
3,4-Dihydro-3-vinyl-1,2-dithiin 1165 - 1.37 - -
Dimethyl tetrasulfide 1224 1.32 1.59 0.02 -
2,5-Dimethylthiazole 1265 4.62 - - -
Diallyl trisulfide 1319 22.17 41.62 - -
3-Methoxyoctane 1327 - 0.62 - -
Dipropyl trisulfide 1334 11.11 - - -
1-propenyl propyl sulfide 1345 1.26 - - -
Allyl propyl sulfide 1377 - 1.30 - -
Di-1-propenyl sulfide 1382 1.71 2.08 - -
Benzylisothiocyanate 1393 - - 63,19 97.63
p-methoxybenzylcyanide 1395 - 0.85 - 1,2
Β-caryophyllene 1398 - 0.23 - -
2-methyl-3-isothiozolone 1435 2.23 - -- -
Germacrene D 1484 - - 0.02 -
γ-cadinene 1506 - 0.39 - -
2-methyl-3,4-dithiaheptane 1527 9.88 - -  
Β-sesquiphellandrene 1550 - - 0.05 -
Diallyl tetrasulfide 1558 - 4.22 - -
p-methoxybenzylisothiocyanate 1575 3.55 - - -
Dipropyl tetrasulfide 1649 8.07 - - -
Benzyl sulfide 1856 - - 0.06 -
Methyl linolenate 2013 - - 0.06 -
Total identified (%) 98.77 100 99.70 100
EOs extraction yields (%) 0.007 0.2 0.04 0.02
  1. RI linear retention indices on a HP5 column; − not found; EO essential oils