This is particularly necessary because the LOD and LOQ may be outside the linearity range at high calibration ranges (isoamyl acetate, ethyl hexanoate
, ethyl octanoate, and ethyl decanoate) if a signal-noise validation procedure would be performed .
AEDA found that acetaldehyde, 2-methylpropanal, 2-methylbutanal, 3-methylbutanal, acetic, butanoic, hexanoic, octanoic, and decanoic acids, ethyl butanoate, ethyl hexanoate
, dimethyl trisulfide, methional and phenylacetaldehyde had high FD values.
Conversely, the study by PINO & QUERIS (2011) on the characterization of guava wine described twelve active odor compounds, including (3-damascenone, ethyl octanoate, ethyl hexanoate
, and ethyl butanoate.
The following analytical standards were purchased from Sigma-Aldrich (Germany): ethyl butanoate, ethyl crotonate, butyl acetate, butyl butanoate, ethyl hexanoate
, hexyl acetate, propyl hexanoate, ethyl octanoate, octyl acetate, isoamylhexanoate, methyl acetate, hexyl hexanoate, ethyl decanoate, citronellyl acetate, 2-heptenal, nonanal, trans-2-nonenal, decanal, cis-3-hexen-1-ol, trans-3-hexen-1-ol, hexan-1-ol, 1octanol, linalool, [alpha]-pinene, [beta]-pinene, myrcene, limonene, [gamma]-terpinene, [alpha]-terpinene, terpinolene, [alpha]-ionone, [beta]-ionone, 6methyl-5-hepten- 2-one, rose oxide, and citronellol.
The plant volatiles were hexanol (>95%), (-)-limonene (>95%), nonacosane (>98%), and ethyl hexanoate
Examples of the mass spectra obtained are shown for the largest peak (ethyl hexanoate
) and a peak more than 11,000 times smaller (tridecanal).
High on the list are our old friends, the strawberry volatiles--estery ethyl hexanoate
, the alcohol furaneol--along with other primary fruits.
Other relatively odor-active compounds were fruity, sweet and flowery compounds such as ethyl hexanoate
, linalool, phenylacetic acid, and ethyl 2-methylbutanoate, while malty, buttery or cooked-potato-like impressions originated e.g.
The higher FU (0.77, 0.33, and 0.29) in OB is associated with isoamyl alcohol, ethyl hexanoate
, and acetaldehyde, respectively.
Foremost, the wood aged Chinese Baijiu flavor is characterized by an increase in ethyl hexanoate
, which imparts a sweet and fruity nuance.
Among the esters identified in both extraction techniques, ethyl butanoate, ethyl hexanoate
, (3z)-3-hexenyl acetate, hexyl acetate, hexyl butanoate and hexyl hexanoate were the major ones.
Eight compounds, namely 2-heptanone (2), 1-heptanol (7), 3-octanone (8), ethyl hexanoate
(10), 2-ethylhexan-1-ol (13), ethyl octanoate (27), (E)-[alpha]-bergamotene (34), and (E,E)-[alpha]-farnesene (36) were shared by the aeration extracts and salivary-gland extracts of the mango and starfruit populations and together generated 63.51% and 82.22% (for the mango population), 71.79% and 66.87% (for the starfruit population) of the total chemical variability.