Compound Identification. Positive identifications were
based on the comparison of GC retention indices (RI) (11),
Wiley mass spectral database (12), and aroma properties of
unknowns with those of authentic standard compounds. When
standards were not available, compounds were identified on
the basis of comparison of mass spectra with those in the Wiley
mass spectral database or by comparison of RI values (13) and
aroma properties with literature data