Table 1.

Odour properties of C. burmannii Blume essential oil as identified by GC–MS

Compound	Retention time (min)	Relative content (%)	Odour descriptora	Threshold (µg/L)a
Monoterpene hydrocarbons
α-Pinene	4.59	4.54 ± 0.02	Pine-needle-like1	6.008
Camphene	4.81	2.15 ± 0.04	Camphoraceous1	1.9810
β-Pinene	5.19	1.31 ± 0.05	Terpene-like1	1408
p-Cymene	5.82	0.32 ± 0.02	Fresh, weak citrus like1	11.48
Limonene	5.89	1.59 ± 0.11	Citrus like1	10008
Oxygenated monoterpenes
1,8-cineole	5.95	3.58 ± 0.17	Balsamic9	5.089
Linalool	6.87	0.35 ± 0.01	Strong sweet floral2	6.008
Borneol	8.03	0.81 ± 0.04	Camphoraceous1	14010
4-Terpineol	8.18	1.33 ± 0.01	Flower5	1308
α-Terpineol	8.36	1.70 ± 0.01	Oil, anise, mint3	3308
Bornyl acetate	9.81	3.02 ± 0.09	Sweet, green2	138012
Sesquiterpene hydrocarbon
α-Copaene	11.16	4.95 ± 0.09	Vegetable-like1
β-Elemene	11.34	0.30 ± 0.02	Weak-fresh1
Zingiberene	11.63	0.41 ± 0.04	Spicy1
Trans-β-caryophyllene	11.83	2.10 ± 0.10	Fruity warm floral2	648
α-Humulene	12.30	0.54 ± 0.05	Weak woody1	16012
γ-Muurolene	12.53	1.23 ± 0.07	Weak woody1
α-Guaiene	12.74	0.62 ± 0.15	Weak woody1
α-Muurolene	12.84	1.56 ± 0.03	Weak woody1
δ-Cadinene	13.13	2.78 ± 0.14	Woody1
Cadina-1,4-diene	13.28	0.33 ± 0.11	Weak spicy1
α-Calacorene	13.44	0.25 ± 0.06	–
α-Cubebene	14.53	0.43 ± 0.11	Herbal1
Oxygenated sesquiterpene
δ-Cadinol	14.71	0.65 ± 0.01	Weak woody1
Other
Benzaldehyde	4.97	0.29 ± 0.01	Hazelnut, pungent4	3508
Benzylacetaldehyde	7.92	1.38 ± 0.04	Floral4
Cinnamaldehyde	9.70	56.02 ± 0.56	Cinnamon spicy2	6008
Cinnamyl acetate	11.98	3.99 ± 0.27	Sweet floral spicy balsamic6	15011
Coumarin	12.13	1.32 ± 0.11	Sweet-herbaceous, cherry flower-like7

^aReferences ¹Jirovetz et al. (2002), ²Mahattanatawee et al. (2005), ³ Kraujalytė et al. (2012), ⁴ Selli and Cayhan (2009) ⁵ Ugliano and Moio (2008), ⁶Brechbill (2007), ⁷ Yang et al. (2009), ⁸ Narbona et al. (2010), ⁹Benzo et al. (2007), ¹⁰ Qian and Wang (2005), ¹¹Pino and Queris (2011), ¹²Pino and Mesa (2006)