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The chemical composition of commercial marjoram (Origanum majorana) essential oils sourced from Serbia and Egypt was investigated using GC and GC-MS. The major volatile compounds in both oils were terpinen-4-ol and ?-terpinene, constituting over a third of the oils based on GC peak areas. However, there were significant differences between the two oils in terms of their cis- and trans-sabinene hydrate content, which are commercially important monoterpenes. The Egyptian oil contained 12.1% trans-sabinene hydrate and 3.5% cis-sabinene hydrate, while the Serbian oil contained a total of 7.3% cis- and trans-sabinene hydrates in a 1:1.7 ratio.
Đorđević et al. (Mon,) studied this question.
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