Table 2.

Descriptions of some interesting volatiles contained in oolong tea infusion

Compounds	RI	Relative contenta,b (%)	Aroma performance	Odor description
Nonanal		ND	No contribution	Orange-like (Kumazawa and Masuda, 2002)
Isopentyl hexanoate		ND	No contribution	Fruity (Rodríguez et al., 2015)
β-Bisabolene		ND	No contribution	Orange (Macleod and Pieris, 1984)
Benzyl alcohol		ND	No contribution	Fruity (Ito et al., 2002)
2-Phenylethyl alcohol		ND	No contribution	Rose (Qin et al., 2013)
(E)-β-Ocimene	1257	0.98 ± 0.14	Stable and persistent	Herbal (Zeng et al., 2017a)
Linalool	1562	1.62 ± 0.02	Stable and persistent	Floral (Katsuno et al., 2014; Qin et al., 2013)
(E)-β-Farnesene	1673	3.48 ± 0.02	Stable and persistent	Citric, sweet, wood (Rodríguez et al., 2015)
Naphthalene	1735	4.13 ± 0.62	Stable and persistent	Naphthalene (Yang et al., 2008)
α-Farnesene	1754	1.70 ± 0.06	Stable and persistent	Fruity, herbal (Zeng et al., 2017a)
Methyl salicylate	1769	0.54 ± 0.14	Stable and persistent	Sweet (Qin et al., 2013)
(Z)-Jasmone	1912	0.28 ± 0.04	Stable and persistent	Floral, green (Katsuno et al., 2014; Qin et al., 2013)
Nerolidol		23.59 ± 5.74	Stable and persistent	Floral, fruity (Qin et al., 2013)
6-Methyl-5-hepten-2-one	1348	2.21 ± 0.36	Less persistent	Sweet, fruity (Qin et al., 2013)
Benzaldehyde	1531	3.87 ± 0.77	Less persistent	Fragrant, sweet (Qin et al., 2013)
Benzeneacetaldehyde	1648	4.93 ± 0.58	Less persistent	Sweet, almond (Qin et al., 2013; Zhu et al., 2017)
Benzyl nitrile	1916	3.87 ± 0.18	Less persistent	Stale, hay (Macleod and Panchasara, 1983)
Phenethyl isobutyrate		1.11 ± 0.30	Less persistent	Fruity, Rose (Rodríguez et al., 2015)
Indole		17.63 ± 1.38	Less persistent	Floral, amimalic (Katsuno et al., 2014; Qin et al., 2013)

RI retention indices

^aData of tea liquid (without leaves) analyzed at the tea/water ratio of 1:50 (g/mL)

^bND: not detected in the infusion headspace