Compounds with the highest concentrations included ethyl octanoate (383.0[micro]g [L.sup.-1]), isobutyl acetate
(335.0[micro]g [L.sup.-1]), ethyl 3(E)-hexenoate (176.0[micro]g [L.sup.-1]), ethyl decanoate (116.0[micro]g [L.sup.-1]), hexyl acetate (106.3[micro]g [L.sup.-1]), and 2-phenylethyl acetate (100.l[micro]g [L.sup.-1]).
* Ethyl acetate, isobutyl acetate
, isoamyl acetate and 2 phenethyl acetate.
Model apple juice samples were prepared by the researchers who used three concentrations of sucrose and fructose, and two concentrations of glucose, with a fixed concentration of six characteristic apple aroma-flavor compounds, including isobutyl acetate
, hexanal, butyl acetate, trans-2-hexenal, propyl butyrate and hexyl acetate.
Identification and quantification was based on external calibration with standard solutions of acetaldehyde, 2-pentanone, 2-butanone, ethylacetate (Fluka, Buchs SG, Switzerland); ethanol (Arcus, Oslo, Norway); 2-methyl-1-propanol, 2-methyl-1-butanol, 2-methyl-1-butanal, 3-methyl-1-butanol, 2-methyl-1-butanol, 2-methyl-1-propanol, 3-methyl-1-butanal, 3-methyl-1-butanol, 2-methyl-1-butanol, 2-methyl-1-propanal, diacetyl, 2-propanol, 1- butanol, 2-butanol, acetoin, iso-butylacetate, acetone, 2,3-pentanedione, ethylacetate, acetone, isobutyl acetate
and ethyl butyrate (Merck KGaA, Darmstadt, Germany).
Products: Carbitol[TM] solvent (DE), Methyl Carbitol (DM), Methyl Carbitol fuel additive grade, Dowanol PnB, Dowanol DPnB, Dowanol TPnB, Poly PnB, Dowanol PnP, Dowanol DPnP, Poly PnP, n-propanol, Propanol PA PM 6719, n-butanol, isobutanol, isobutanol mixtures, 2-ethylhexanol, n-butyl acetate, isobutyl acetate
, isopropyl acetate, n-propyl acetate, primary amyl aceteate, UCAR[TM] Filmer IBT, UCAR n-butyl propionate, UCAR n-pentyl propionate, UCAR n-propyl propionate, UCAR Ester EEP
In 1995, non-TRI solvents, including methyl amyl ketone (MAK), n-butyl acetate and isobutyl acetate
, were substituted in place of the solvents in use at that time.
Among the total esters determined in the experiment, no significant difference was observed for isobutyl acetate
, butyl acetate and 3(Z)-hexenyl acetate for fruits with and without 1-MCP (Table 1).
Stock isobutyl acetate
(0.1 g) was weighed into 100 ml volumetric flask with cyclohexane.