Some Volatile Constituents of Passion Fruit Wine

Abstract

SUMMARY A dry table wine prepared from Passiflora edulis var. flavicarpa was found to contain the following volatile substances: methyl alcohol, ethyl alcohol, isobutyl alcohol, isobutyl alcohol, active amyl alcohol, n‐hexyl alcohol, 2‐phenethyl alcohol, acetaldehyde, diethyl acetal, 2‐butanone, 2,3‐butanedione, ethyl acetate, ethyl isovalerate, ethyl caproate, ethyl heptanoate, ethyl caprylate, ethyl caprate, ethyl laurate, isobutyl isobutyrate and isoamyl acetate. Probably present are: n‐butanol, ethyl isobutyrate, and n‐hexyl caproate. Gas chromatographic retention times are given for a number of unidentified components of the passion fruit wine volatiles. The compounds responsible, for the typical passion fruit wine aroma remain unidentified.

The Occurrence of Two Geometrical Isomers of 2,4,5-Trimethyl-1,3-Dioxolane in Beer

“…Furthermore, a number of cyclic acetals have also been identified as artefacts in several commercial flavourings which employ 1,2-propancdiol as solvent. [15][16][17][18][19][20][21][22][23][24][25] The acetals detected in fermented beverages are mostly of the type formed by reaction of aldehydes with simple monohydric alcohols. The most common example of this group is 1,1-diethoxyethane (acetal), which has previously been identified as a beer constituent.8 A number of cyclic acetals, derived from polyhydric alcohols, have also been charac terised.…”

Identification of 4-ethoxy-4-hydroxybutric acid .gamma.-lactone [5-ethoxydihydro-2(3H)-furanone] as an aroma component of wine from Vitis Vinifera Ruby Cabernet

“…The solvent layer was replaced with fresh solvent every day until no more aroma materials were being extracted. The larger sample was extracted in a 50-gal stainless steel drum arranged so that it could be rotated slowly on a set of four power driven wheels, as described previously (Muller et al, 1971). An internal drain line and external valve were fitted so that, when the drum head was tilted slightly lower than the bottom, the solvent could all be removed and replaced with fresh solvent.…”

“…The extracting solvent was stripped, the free acids were separated, and the neutral essences were fractionated gas chromatographically, as described previously (Webb et al, 1967(Webb et al, , 1969Muller et al, 1971) on a Loenco dual column, dual thermal conductivity detector instrument with nitrogen carrier gas flow rates of 50 ml/min and filament currents of 100 mA. The desired unknown lactone emerged as peak 39 after the peaks for butyrolactone and diethyl succinate and before that of 2-phenethyl alcohol on FFAP columns.…”

Gas Chromatography

“…Also of bioanalytical interest is the development of a special biopsy needle which allows the direct injection of body tissue into a chromatograph for analysis of anesthetic gases (116) and the satisfactory comparision of the Van Slyke method and the gas chromatographic method for measuring blood oxygen and' carbon dioxide (532). Finally, a few novel applications, including the determination of the constituents of passion fruit wine (448) Chem., Prod. Res.…”