Table 1.

Correspondence between attributes/reference materials in the B-H database and descriptors in the H&R Fragrance Guide [17]. A substantivity index (SI) is calculated according to Equation (1) based on the frequency of occurrence of odor descriptors used to describe the top (N_T), middle (N_M) and base note (N_B) of 820 commercial perfumes.

Attribute a	p1	H&R Fragrance Guide					Attribute a	p1	H&R Fragrance Guide
		Descriptor	NT	NM	NB	SI			Descriptor	NT	NM	NB	SI
bergamot oil	0.341	bergamot	722	0	0	0	floral	−0.010	floral	86	681	47	48
fresh	0.341	fresh	576	63	8	6	honey	−0.064	honey	3	50	38	69
green	0.279	green	240	35	1	7	anisic	−0.081	anise	50	11	0	9
watery	0.260	watery	0	1	0		cedarwood oil	−0.124	cedarwood	0	159	364	85
lemon oil	0.189	lemon	401	1	0	0	woody	−0.124	woody	3	166	305	82
citrusy	0.189	citrusy	57	0	0	0	civet absolute	−0.142	civet	0	0	199	100
galbanum res.	0.180	galbanum	113	7	0	3	animal	−0.142	castoreum	0	0	83	100
tart (dry)	0.180	dry	19	63	0	38	smoky	−0.144	leathery	0	1	104	100
aldehyde	0.177	aldehydic	140	0	0	0	amber.+costuse	−0.161	ambery	0	0	137	100
bay oil	0.165	bay	5	11	0	34	erogenic	−0.161	sensual	0	0	70	100
lavender oil	0.128	lavender	204	26	0	6	eugenol	−0.182	clove f	0	26	0	50
clary sage oil	0.126	clary sage	83	62	0	21	spicy	−0.182	spicy	163	244	1	30
vegetable	0.126	herbaceous	165	7	2	3	patchouli oil	−0.197	patchouli	0	136	253	83
fruity	0.085	fruity	151	24	3	8	vanillin	−0.221	vanilla	0	0	301	100
fruity	0.085	peach b	149	7	0	2	olibanum res.	−0.249	olibanum	0	3	117	99
fir needle oil	0.061	fir c	0	24	41	82	balsamic	−0.249	balsamic	0	0	76	100
coniferous	0.061	pine c	1	87	0	49	sweet	−0.280	sweet	0	50	157	88
peppermint oil	0.045	peppermint d	29	2	0	3	sweet	−0.280	tonka g	0	1	287	100
oakmoss res.	−0.008	oakmoss	0	0	139	100	musk+coumarin h	−0.323	musk	0	0	698	100
earthy	−0.008	mossy	0	0	252	100	powdery	−0.323	powdery	0	0	376	100
jasmine absolute	−0.010	jasmine	0	671	0	50	powdery	−0.323	warm	0	0	137	100

^aReference materials (in italics) and descriptors are listed by decreasing order of p₁ (loadings in the formation of the first principal component). The term ‘res.’ stands for resinoid. The correspondence between descriptors and references used by Boelens & Haring [12] is indicated in Table 2.

^bPeach is the fruity descriptor most frequently encountered in the H&R guide.

^cPine and fir trees are conifers and their essential oil smells alike.

^dPeppermint or spearmint.

^eMixture of ambergris and costus oil.

^fClove oil contains >85% of eugenol [25].

^gTonka is the second attribute (after vanilla) most frequently associated to sweet in the H&R guide.

^hMixture of musk ketone and coumarin.