Leonard P. Stoltz

3,6-Nonadien-1-ol from Citrullus vulgaris and Cucumis melo

Abstract cis , cis -3,6-Nonadien-1-ol isolated from watermelon and previously from muskmelon by vacuum steam distillation-extraction, was identified by int

cis-6-Nonenal: A flavor component of muskmelon fruit

Abstract cis -6-Nonenal, a compound with melon-like flavor, has been isolated from muskmelon fruit by vacuum steam distillation. The concentration of cis -6-nonenal in fruit exceeds the flavor threshold concentration in aqueous solution.

Volatile Cucumis melo components: Identification of additional compounds and effects of storage conditions

Abstract Additional volatile compounds were isolated from muskmelon fruit by means of a water recycling apparatus, separated by GLC, and identified principally by MS and GLC retention data. Compounds reported for the first time as melon components are: n -hexanol, 1-octen-3-ol, cis -3-nonen-1-ol, n -butyl acetate, iso butyl acetate, 2-methylbutyl acetate, n -hexyl acetate, ethyl n -butyrate, ethyl 2-methylbutyrate, benzyl acetate, β-phenethyl acetate, and γ-phenylpropyl acetate. Muskmelon fruit stored frozen prior to steam distillation-extraction yielded an essence which, when compared with that obtained from freshly harvested fruit, contained considerably larger amounts of trans -2-nonenal, n -nonanol, cis -3-nonen-1-ol, cis -6-nonen-1-ol, and the methyl and ethyl esters of linoleic and linolenic acids. Marked decreases in the relative amounts of benzyl acetate, β-phenethyl acetate, and γ-phenylpropyl acetate resulted from freezing. All 21 compounds examined were present in the essences prepared from fresh, refrigerated, and frozen fruit.

Characterization of some volatile components of muskmelon fruit

Abstract Muskmelon fruit oil obtained by vacuum steam distillation at 60–70° was shown to contain n -octanol, n -nonanol, 2-nonenal, 2-nonenol, n -octyl acetate, n -octyl butyrate, β-ionone, methyl palmitate, methyl palmitoleate, methyl oleate, methyl linoleate, methyl linolenate, ethyl palmitate, ethyl palmitoleate, ethyl oleate, ethyl linoleate, ethyl linolenate. The identities of compounds were confirmed by direct comparison of their mass spectra and GLC retention data with those of authentic samples. Other compounds tentatively identified on the basis of mass spectral data were nonadienol, nonenol, octyl hexanoate and butyl palmitoleate. The nonadienol was associated with the muskmelon-like aroma.

Aromatic hydrocarbons: Examination of peach fruit and foliage volatiles

Abstract Peach fruit volatiles obtained by steam distillation contained 1,2-dihydro-1,1,6-trimethylnaphthalene while foliage volatiles also contained this compound in addition to 1,2,3,4-tetrahydro-1,1,6-trimethylnaphthalene (ionene) and two C 14 H 22 hydrocarbons. Other compounds isolated from foliage were hexanal, trans -2-hexenal, trans -3-hexen-1-ol, benzaldehyde, nonanal, methyl salicylate and eugenol.

1,2-Dihydro-1,1,6-trimethylnaphthalene from strawberry oil

Abstract 1,2-Dihydro-1,1,6-trimethylnaphthalene (3,4-dehydroionene) has been identified in the essential oil of strawberry fruit and foliage.

Cytokinins from growth regulator autonomous callus tissue

Abstract Callus tissue of the monocotyledon, Haworthia mirabilis Haw., was cultured in the absence of exogenous plant growth regulators (cytokinin and auxin). The tissue was extracted with aqueous ethanol and the extract was purified by chromatography and tested with the tobacco callus cell division assay. Cytokinins with chromatographic properties corresponding to those of zeatin and zeatin riboside were detected. Transfer RNA was isolated from the autonomous tissue, hydrolyzed enzymatically and examined for cytokinin activity. Cytokinin-active ribonucleosides with chromatographic properties corresponding to those of zeatin riboside and N 6 -(Δ 2 - isopentenyl ) adenosine were found. This is the first reported analysis of cytokinins from spontaneously autonomous callus from a monocotyledon. Exogenous growth regulators in the culture medium affect the content of free, ethanol-soluble cytokinins in the callus tissue.