Volatile components of green walnut husks

Volatiles were isolated from whole green mature walnuts (Hartley variety) w ith husks still intact using dynamic headspace sweeping with trapping on Te nax. A total of 45 volatile compounds were identified by GC-MS. Major volat iles identified included (E)-4,8-dimethyl-1,3,7-nonatriene, pinocarvone, pi nocarveol, myrtenal, myrtenol, (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetra ene, caryophyllene epoxide, verbenol, verbenone, and terpinolene. Green wal nuts that had been infested with codling moth showed appreciably higher amo unts emitted for (E)-4,8-dimethyl-1,3,7-nonatriene, (E,E)-4,8,12-trimethyl- 1,3,7,11-tridecatetraene, alpha- and beta-pinenes, sabinene, (E)-beta-ocime ne, (E,E)-alpha-farnesene, and linalool. The infested nuts also emitted ben zyl methyl ether, isobutyl cyanide, and 1-nitro-3-methylbutane, compounds n ot found with the healthy nuts. Volatiles from uninfested green walnuts at the maturity stage where the husk was just beginning to split were also ana lyzed and compared.