Aroma extract dilution analysis of cv. Meeker (Rubus idaeus L.) red raspberries from Oregon and Washington

The aromas of cultivar Meeker red raspberry from Oregon and Washington were analyzed by aroma extract dilution analysis. Seventy-five aromas were identified [some tentatively (superscript T)] by mass spectrometry and gas chromatography-retention index; 53 were common to both, and 22 have not been previously reported in red raspberry. Twenty-one compounds had an equivalent odor impact in both: 2,5-dimethyl-4-hydroxy-3-(2H)-furanone, hexanal, 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one, (E)-beta-3,7-dimethyl-1,3,6-octatrieneT, 6,6-dimethyl-2-methylenebicyclo[3.1.1]heptaneT, 1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one, ethanoic acid, (Z)-3-hexenalT, 3-methylmercaptopropionaldehyde, (Z)-3-hexenol, 2,6-dimethyl-2,7-octadien-6-ol, butanoic acid, ethyl 2-methylpropanoate, (E)-2-hexenal, hexyl formateT, 2,3-butanedione, heptanalT, thiacyclopentadieneT, cyclohexane carbaldehydeT, (E)-3,7-dimethyl-2,6-octadien-1-olT, and 4-(p-hydroxyphenyl)-2-butanone. Oregon Meeker had 14 odorants with higher flavor dilution (FD) factors than Washington Meeker: 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-oneT, 1-octanol, 5-isopropyl-2-methylcyclohexa-1,3-dieneT, 7-methyl-3-methylene-1,6-octadieneT, ethyl hexanoate, 3-methylbutyl acetateT, ethyl propanoate, 4-(4-hydroxy-3-methoxyphenyl)-2-butanoneT, 2-methylbutanoic acid, 1-octen-3-ol, ethyl cyclohexane carboxylateT, 2-methylthiacyclopentadieneT, (Z)-3-hexenyl acetateT, and 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-olT. Washington Meeker had 16 odorants with higher FD factors than Oregon Meeker: 5-ethyl-3-hydroxy-4-methyl-2-(5H)-furanoneT, dimethyl sulfideT, 2-ethyl-4-hydroxy-5-methyl-3-(2H)-furanoneT, 1-hexanolT, ethyl 2-methylbutanoate, 3,7-dimethyl-1,6-octadien-3-yl acetateT, methyl hexanoate, phenyl ethanoic acidT, neo-allo-3,7-dimethyl-1,3,6-octatrieneT, 2-nonanoneT, 2-(4-methylcyclohex-3-enyl)propan-2-olT, phenylmethanolT, 5-octanolideT, 2-phenylethanol, 1-isopropyl-4-methylenebicyclo[3.1.0]hexaneT, and 2-undecanone.