Journal
JOURNAL OF SEPARATION SCIENCE
Volume 31, Issue 1, Pages 162-168Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.200700371
Keywords
accelerated solvent extraction; pressurized solvent extraction; terpenes; walnut tree; Juglans spp.
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Terpenes, e.g. (+)-alpha-pinene, (-)-camphene, (-)+pinene, myrcene, R-(+)-limonene, eucalyptol, (+/-)-linalool, (-)-bornyl acetate, (-)-trans-caryophyllene, and a-humulene were determined in leaves of walnut trees from the Juglandaceae family (walnut tree, royal U. regia L.), black U. nigra L.), and Siebold (J. sieboldiana, var. Cordiformis Lam.) using gas chromatography with mass spectrometric detection. Terpenes were repeatedly (3 cycles, 5 min each) extracted from leaves of walnut trees by accelerated (pressurized) solvent extraction (ASE) 150 bar and 120 degrees C. The efficiency of ASE extraction was superior to that of steam distillation, solvent extraction according to Soxhlet, sonication, and extraction by agitation. Differences in relative concentrations and distribution of terpenes were studied in dependence on the species of walnut tree and on different locations.
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