Eric D. Lund

Leaf Volatiles of Mycorrhizal and Nonmycorrhizal Citrus Jambhiri Lush

ABSTRACT Gas chromatography and GC/MS were used to identify terpenoids and other volatiles from leaves of rough lemon rootstock seedlings which were grown in soil of three treatments. Treatments were soil low in phosphorus (P), the same soil amended with 440 ppm P, and the low P-soil amended with the mycorrhizal fungus Glomus intraradices (G.i.). Treatments yielded 30, 78, and 81 separate components, respectively. A total of 101 different components were present among the three treatments, and of these, 48 were chemically identified. Nine to ten compounds were unique to each of the treatments. A total of eight sesquiterpenes were present, and plants in the low-P soil amended with G.i. contained the highest relative concentration of sesquiterpene hydrocarbons, 16.06%, followed by 13.82% in plants in the low-P unamended soil and 8.03% in plants in soil amended with P. No single sesquiterpene was an indicator of stress in the stunted nonmycorrhizal plants. The qualitative simplicity of extracts from plants i...

Polyacetylenic carbonyl compounds in carrots

Abstract Examination of the carbonyl-containing polyacetylenes in carrots showed that the previously reported compound falcarindiol-3-monoacetate consisted of a mixture of the 3-acetate and its allylic isomer, 1-acetoxyheptadeca-2,9-diene-4,6-diyn-8-ol. The other polyacetylenic carbonyl previously identified, falcarinolone, was present only as an artifact derived from autooxidation of falcarindiol during the isolation procedure.

Sesquiterpene hydrocarbons in processed stored carrot sticks

Abstract The sesquiterpene hydrocarbon composition in processed, stored carrot sticks was studied as part of an investigation on the changes in secondary metabolites that occur during processing and storage of carrots. Carrot sticks were treated by infusion with antimicrobial compounds, antioxidants and cellular constituents and stored in plastic vacuum shrink bags at 2°C for up to three weeks. In each of the five treatments studied, the concentrations of the two major sesquiterpene hydrocarbons, caryophyllene and γ-bisabolene, increased markedly in the second week of storage while the concentrations of these two compounds in control samples decreased moderately during this same period. It appears that the infusion process must stimulate major changes in the sesquiterpene metabolism.

Nootkatene from Citrus sinensis

Abstract The sesquiterpene hydrocarbon nootkatene and an unidentified sesquiterpene hydrocarbon, MW 204, have been isolated from Valencia orange peel.