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. 2013 Nov 1;18(11):13574–13587. doi: 10.3390/molecules181113574

Table 1.

Seasonal variation of the chemical composition of essential oils obtained from the leaves of Porcelia macrocarpa (monthly collection from January to December 2011).

Relative amount (%) b
Compound a KI January February March April May June July August September October November December
verbanyl acetate 1340 0.39 ± 0.04 a 0.43 ± 0.01 a 0.40 ± 0.01 a 0.46 ± 0.06 a 0.51 ± 0.02 a 0.42 ± 0.01 a 0.42 ± 0.04 a 0.41 ± 0.03 a 1.76 ± 0.96 a 0.34 ± 0.01 a 0.31 ± 0.19 a 0.38 ± 0.01 a
α-copaene 1376 2.0 ± 0.3 a 1.6 ± 0.9 a 2.05 ± 0.07 a 2.2 ± 0.2 a 1.9 ± 0.8 a 1.95 ± 0.02 a 2.01 ± 0.09 a 1.8 ± 0.2 a 2.4 ± 0.9 a 1.71 ± 0.01 a 0.4 ± 0.2 b 2.07 ± 0.05 a
iso-longifolene 1387 1.4 ± 0.1 a 1.5 ± 0.1 a 1.9 ± 0.1 a 2.0 ± 0.9 a 1.8 ± 0.9 a 0.9 ± 0.8 b 0.50 ± 0.02 b 0.53 ± 0.02 b 1.8 ± 0.9 a 1.2 ± 0.7 b 0.6 ± 0.2 b 0.23 ± 0.01 b
β-cedrene 1418 0.72 ± 0.06 a 0.80 ± 0.07 a 0.75 ± 0.01 a 0.9 ± 0.1 a 1.3 ± 0.4 b 1.4 ± 0.4 b 1.08 ± 0.02 b 1.1 ± 0.1 b 0.96 ± 0.01 a 0.85 ± 0.09 a 0.6 ± 0.3 a 0.85 ± 0.02 a
α-guaiene 1439 0.9 ± 0.3 a 1.1 ± 0.3 a 0.71 ± 0.01 a 0.56 ± 0.03 b 0.52 ± 0.07 b 0.61 ± 0.08 b 0.43 ± 0.01 b 0.61 ± 0.02 b 0.61 ± 0.01 b 0.4 ± 0.2 b 0.41 ± 0.07 b 0.89 ± 0.01 a
germacrene D 1480 40 ± 7 a 39 ± 7 a 46.3 ± 0.4 a 47 ± 1 a 49.6 ± 0.7 b 47.1 ± 0.9 a 49 ± 2 b 45 ± 1 a 46.6 ± 0.1 a 43 ± 3 a 28.8 ± 0.8 b 46.2 ± 0.7 a
bicyclogermacrene 1494 31 ± 3 a 28 ± 7 a 34.2 ± 0.3 a 37 ± 1 a 34 ± 2 a 36.8 ± 0.5 a 32 ± 2 a 30.8 ± 0.2 a 32.5 ± 0.1 a 35 ± 3 a 23.9 ± 0.6 b 32.7 ± 0.3 a
spathulenol 1576 0 0 0 0 0 0 0 0 0 0 10.4 ± 0.2 0
phytol 1955 7.3 ± 0.9 a 18 ± 2 b 3.2 ± 0.2 c 1.2 ± 0.3 d 0.55 ± 0.05 d 0.45 ± 0.04 d 0.6 ± 0.2 d 0 0.7 ± 0.5 d 0.6 ± 0.2 d 1.24 ± 0.04 d 0.55 ± 0.01 d
monoterpenes 0.39 ± 0.04 0.43 ± 0.01 0.40 ± 0.01 0.46 ± 0.06 0.51 ± 0.02 0.42 ± 0.01 0.42 ± 0.04 0.41 ± 0.03 1.76 ± 0.96 0.34 ± 0.01 0.31 ± 0.19 0.38 ± 0.01
sesquiterpenes 76 ± 3 72 ± 3 85.9 ± 0.2 89.4 ± 0.7 88.6 ± 0.6 88.7 ± 0.4 85 ± 1 79.5 ± 0.6 84.8 ± 0.5 82 ± 1 65.0 ± 0.3 80.7 ± 0.5
diterpene 7.3 ± 0.9 18 ± 2 3.2 ± 0.2 1.2 ± 0.3 0.55 ± 0.05 0.45 ± 0.04 0.6 ± 0.2 0 0.7 ± 0.5 0.6 ± 0.2 1.24 ± 0.04 0.55 ± 0.01
TOTAL 84 ± 2 90 ± 3 89.6 ± 0.1 91.1 ± 0.6 90 ± 1 89.6 ± 0.4 89 ± 1 79.9 ± 0.4 86.8 ± 0.3 83.7 ± 0.7 66.6 ± 0.1 82.1 ± 0.3

a Individual compounds were assigned according to their Kovats indices in conjunction with a comparison of the experimentally obtained mass spectra to those described in library (NIST 107) and in the literature [22]; b Values in the same line with different subscript (a, b, c, and d) are significantly different within months of collection; t: (p < 0.05). All values displayed represent the mean value ± standard deviation of three independent experiments. Statistical analyses were performed by analysis of variance (ANOVA) using the BIOESTAT 5.0 (Stat Soft Inc., Tulsa, OK, USA) software package. A probability value of p < 0.05 was considered statistically significant.