Table II. Terpene volatiles in five heritage apple cultivars.

Terpene volatiles from five heritage apple cultivars and cv Royal Gala were sampled at approximately 150 DAA by solvent extraction. Compound identification was as described in Table I with the following additions: Additional authentic standards were obtained from: *Aldrich, **Synthesis, ***Givaudan. References for retention indices are listed in the footnotes.

Compound	Retention Time	Retention Index	cv Royal Gala	cv King David	cv Wilmont Russet	cv Belle Bonne	cv Adam’s Permain	cv Merton Russet
Limonene	6.59	1,234a	ND	0.7	0.8	0.9	1.2	0.8
6-Methyl-5-hepten-2-one*	10.1	1,348b	11	35	100	27	24	14
Bourbonenei	14.35	1,496c	ND	ND	ND	2.4	11	ND
Menthyl acetate**	15.53	1,541d	ND	33	ND	ND	ND	ND
(E)-β-Caryophyllene	16.12	1,618e	ND	ND	ND	3	1.4	ND
(E)-β-Farnesene***	18.09	1,674a	1.6	2.8	1.5	2.2	12	ND
α-Terpineol*	19.63	1,720f	17	0.3	5.7	6.0	7.6	8.6
Germacrene-D	18.66	1,722a	ND	ND	ND	9.9	9.9	ND
(Z,E)-α-Farnesene	19.41	1,727d	2.8	47	39	45	61	2.9
(E,E)-α-Farnesene	19.88	1,749g	47	2,600	2,700	1,400	7,500	220
(E)-Geranyl acetone	22.04	1,840h	ND	18	21	15	21	ND
(E)-Nerolidol*	25.87	2,054a	ND	8.6	ND	7.2	16	ND
(E,E)-Farnesol*	31.44	2,371a	430	900	11	390	440	45
Total terpenes (ng g−1 fresh weight)			509	3,645	2,879	1,909	8,105	291

^aChoi (2003).  ^bBaşer et al. (2009).  ^cBendiabdellah et al. (2012).  ^dDavies (1990).  ^eHögnadóttir and Rouseff (2003).  ^fCulleré et al. (2004).  ^gWerkhoff et al. (1998).  ^hhttp://www.flavornet.org/d_kovats_c20m.html.  ⁱRetention time and distinctive MS (retention index in this sample is 1,498; the compound runs just before pentadecane).