Volatile components of green walnut husks.
Volatiles were isolated from whole green mature walnuts (Hartley variety) with husks still intact using dynamic headspace sweeping with trapping on Tenax. A total of 45 volatile compounds were identified by GC-MS. Major volatiles identified included (E)-4, 8-dimethyl-1,3,7-nonatriene, pinocarvone, pinocarveol, myrtenal, myrtenol, (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene, caryophyllene epoxide, verbenol, verbenone, and terpinolene. Green walnuts that had been infested with codling moth showed appreciably higher amounts 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-ocimene, (E,E)-alpha-farnesene, and linalool. The infested nuts also emitted benzyl methyl ether, isobutyl cyanide, and 1-nitro-3-methylbutane, compounds not found with the healthy nuts. Volatiles from uninfested green walnuts at the maturity stage where the husk was just beginning to split were also analyzed and compared.
Buttery
R G
RG
U.S. Department of Agriculture, Agricultural Research Service, Western Regional Research Center, Albany, California 94710, USA.
Light
D M
DM
Nam
Y
Y
Merrill
G B
GB
Roitman
J N
JN
D008401:Gas Chromatography-Mass Spectrometry; D009285:Naphthoquinones / Q000032:analysis / Q000302:isolation & purification; D009754:Nuts / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D013729:Terpenes / Q000032:analysis; D014835:Volatilization
D009285:Naphthoquinones; D010936:Plant Extracts; D013729:Terpenes; C005134:juglone