Table 1. Aroma values, odor thresholds and volatile content of cucumber fruits.

Compound	Odor Threshold content (ng g-1)	Volatile content (μg g-1)	Aroma value	Flavor description
(E,Z)-2,6-nonadienal	0.01	0.093–1.018	9.3×103–1.018×105	Cucumber-like
(E)-2-nonenal	0.5	0.024–0.132	48–264	Tallowy
Hexanal	4.5	0.074–0.67	16.4–148.9	Green grass
(E)-2-hexenal	17	0.024–0.468	1.41–27.5	Apple like
(E)-6-nonenal	0.02	0.033–0.122	1.65×103–6.1×103	Fruit-like
Nonanal	1	0.002–0.003	2–3	Flower-like
(Z)-2-heptenal	0.8	0.004–0.029	0.5–36.25	Fresh
Pentanal	12–42	0–0.132	0–3.14	Fresh
Propanal	9.5–37	0.147–2.732	15.4–73.8	Stimulate
(E,E)-2,4-heptadienal	10	0.051–0.843	5.1–84.3	Fresh
1-nonanol	50	0.011–0.383	0.22–7.66	Rose
1-hexanol	250	0.019–1.338	0.076–5.35	Strawberry, fresh
(Z)-3,6-nonadien-1-ol	10	0.033–0.166	3.3–16.6	Musky