Table 2.

The comparison of FD factors for odor-active compounds (FD factor ≥32) among four pears

No.	KIa	Compound	Odor descriptionc	FD factor
				‘Sanenashi’	i0830	‘Kosui’	‘La France’
1	943	Ethyl 2-methylpropanoate	fresh, apple-like	32	16		1
2	1008	Methyl 2-methylbutanoate	fruity, fresh, apple-like	32	1		1
3	1033	Ethyl butanoate	fruity, sweet	256	32	64
4	1047	Ethyl 2-methylbutanoate	fresh, fruity, pineapple-like	512	512	256	1
5	1065	Butyl acetate	fruity	8			32
6	1072	Hexanal	green	512	8	16	64
7	1127	Ethyl pentanoate	fruity	32	4	4
8	1130	Cis-3-hexenalb	green	2048	32	16	2
9	1170	Pentyl acetate	fruity	1	1		32
10	1212	Trans-2-hexenal	fresh, green	256	64		32
11	1234	Ethyl hexanoate	fruity, sweet	128	1	4
12	1273	Hexyl acetate	fruity	2	32		32
13	1296		citrus-like	2	64	16	16
14	1300		metallic	32	1	8
15	1307		apple-like, fresh		32
16	1350		floral	2	32
17	1371		burnt metal-like	128	1		2
18	1383	Cis-3-hexenolb	green, cucumber-like	128	1		1
19	1439	Acetic acidb	sour	8	32	8	32
20	1462	3-(methylthio)-1-propanalb	potato-like	8	32	128	64
21	1485		lemony		32	1
22	1527		fruity, apple-like		32	4	2
23	1590		green banana-like, sweet	8	1	256	32
24	1629		citrus-like, unpleasant	32	4		256
25	1736		sweet				32
26	1755		fruity, banana-like		1	32
27	1820		barley-like	32	32	1	32
28	1830		tea-like, alcohol-like	1024	32	1	4
29	1925	2-phenylethanol	rose-like	64	128		1
30	1930		citrus-like, green	2	64		32
31	1977		European pear-like		8		32
32	1993		metallic	1	64		32
33	2010		fruity, fresh	1	1		32
34	2160		Japanese apricot-like, fruity	512	64	8	1
35	2170		medicinal, floral, green	8192	4096	64	64
36	2175		fruity	2	32
37	2225		medicinal	1			32
38	2260		fresh cream-like, vanilla-like	1	1		32
39	2560		vanilla-like	8	8	8	32

^aKI means Kovats Index calculated for the DB-Wax capillary column (60 m × 0.25 mm i.d.).

^bTentatively identified.

^cOdor descriptions obtained from GC/O.