Abstract
1. The volatile essence compounds from mixed varieties of Vitis rotundifolia have been determined to include ethyl alcohol, n-butyl alcohol, n-hexyl alcohol, β-phenylethyl alcohol, an acetate ester, a laurate ester, and an isopropyl ester. Methyl alcohol, n-hexanal, 2-hexenal, and acetal also are probably present. 2. The volatilte essence from the crop of a later year from the same vines was isolated by a technique which included the aroma material produced by fermentation of the grapes. This essence was found to contain methyl alcohol, isoamyl alcohol, acetaldehyde, biacetyl, n-hexanal, 2-hexenal, isobutyraldehyde, ethyl acetate, a caproate ester, a caprylate ester, and a caprate ester in addition to the compounds found definitely present in the unfermented essence. Methyl-ethyl ketone and acetal were also probably present. 3. A reduced pressure pot distilling volatile essence isolation technique is compared with a flash evaporation technique and it is demonstrated that the latter technique isolates an essence which is probably most nearly representative of that which actually exists in the intact grape. 4. Vitis rotundifolia volatile essence is shown to be free of nitrogen and sulfur containing compounds, thus providing a possible means of differentiation from labrusca varieties which contain anthranilic acid esters.
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Claims 6
Claim · model-written summary
Unfermented Vitis rotundifolia essence contained seven identified volatile groups.
- Taxon
- Vitis rotundifolia
Vitis rotundifoliae0 - Material
- mixed varietiese0
- Outcome
- ethyl alcohol, n-butyl alcohol, n-hexyl alcohol, β-phenylethyl alcohol, an acetate ester, a laurate ester, and an isopropyl estere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The volatile essence compounds from mixed varieties of Vitis rotundifolia have been determined to include ethyl alcohol, n-butyl alcohol, n-hexyl alcohol, β-phenylethyl alcohol, an acetate ester, a laurate ester, and an isopropyl ester.”
Claim · model-written summary
Four further volatiles were probably present in the unfermented essence.
- Taxon
- Vitis RotundifoliaVitis rotundifoliat0
- Outcome
- Methyl alcohol, n-hexanal, 2-hexenal, and acetale0
- Qualifier
- probably presente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Methyl alcohol, n-hexanal, 2-hexenal, and acetal also are probably present.”
t0“Vitis Rotundifolia Grapes”
Claim · model-written summary
The later crop essence including fermentation aroma contained eleven additional identified volatiles.
- Taxon
- Vitis RotundifoliaVitis rotundifoliat0
- Outcome
- methyl alcohol, isoamyl alcohol, acetaldehyde, biacetyl, n-hexanal, 2-hexenal, isobutyraldehyde, ethyl acetate, a caproate ester, a caprylate ester, and a caprate estere0
- Comparator
- unfermented essencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This essence was found to contain methyl alcohol, isoamyl alcohol, acetaldehyde, biacetyl, n-hexanal, 2-hexenal, isobutyraldehyde, ethyl acetate, a caproate ester, a caprylate ester, and a caprate ester in addition to the compounds found definitely present in the unfermented essence.”
t0“Vitis Rotundifolia Grapes”
Claim · model-written summary
Methyl-ethyl ketone and acetal were probably present in the later essence.
- Taxon
- Vitis RotundifoliaVitis rotundifoliat0
- Outcome
- Methyl-ethyl ketone and acetale0
- Qualifier
- probably presente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Methyl-ethyl ketone and acetal were also probably present.”
t0“Vitis Rotundifolia Grapes”
Claim · model-written summary
Flash evaporation probably isolated essence most representative of intact grapes.
- Taxon
- Vitis RotundifoliaVitis rotundifoliat0
- Treatment
- flash evaporation techniquee0
- Outcome
- most nearly representative of that which actually exists in the intact grapee0
- Qualifier
- probablye0
- Comparator
- reduced pressure pot distilling volatile essence isolation techniquee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A reduced pressure pot distilling volatile essence isolation technique is compared with a flash evaporation technique and it is demonstrated that the latter technique isolates an essence which is probably most nearly representative of that which actually exists in the intact grape.”
t0“Vitis Rotundifolia Grapes”
Claim · model-written summary
Vitis rotundifolia essence lacked nitrogen and sulfur compounds, a possible distinction from labrusca varieties.
- Taxon
- Vitis rotundifoliaVitis rotundifoliae0
- Outcome
- free of nitrogen and sulfur containing compoundse0
- Qualifier
- possible means of differentiatione0
- Comparator
- labrusca varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis rotundifolia volatile essence is shown to be free of nitrogen and sulfur containing compounds, thus providing a possible means of differentiation from labrusca varieties which contain anthranilic acid esters.”