Changes in composition of volatile terpenes in douglas fir needles during maturation
article
The compositions of the volatile terpenes in Douglas fir new tip growth and in year old needles were investigated over a growing season using a simultaneous steam distillation-extraction method and direct vapor analyses. The results demonstrate the almost complete absence of acyclic oxygenated monoterpenes and cis-ocimene in the new tip growth as it first appears, with the gradual increase in concentration of these components as the growth matures. The cyclic oxygenated monoterpenes are immediately present in the new growth in amounts equal to those in year old growth and show little seasonal variation in either young or old growth. The effects of fertilization with urea vs. gypsum on the volatile terpene compositions and the possible relationship of the terpene compositions of the new tip growth to the greater palatability of this growth to browsing ruminants are discussed briefly.
TNO Identifier
227217
ISSN
00218561
Source
Journal of Agricultural and Food Chemistry, 18(6), pp. 1095-1101.
Pages
1095-1101
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