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A monograph on the physiological properties of star anise oil has been published by the Research Institute for Fragrance Materials (RIFM).
== Composition ==
'''Star anise oil (from Vietnam)''' (Source: Formacek & Kubeczka, 1982)
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* 79.9% (E)-anethole
* 10.4% limonene
* 2.1% α-pinene
* 1.7% β-phellandrene
* 1.0% linalool
* 0.9% δ-3-carene
* 0.6% methyl chavicol
* 0.5% α-phellandrene
* 0.4% myrcene
* 0.4% β-caryophyllene
* 0.4% anisaldehyde
* 0.2% sabinene
* 0.2% α-terpineol
* 0.2% β-pinene
* 0.2% para-cymene
* 0.2% α-terpinene
* 0.2% terpinolene
* 0.1% γ-terpinene
* 0.1% (Z)-anethole
* 99.7% total
</div>
'''Star anise oil (from China)''' (Source: Cu et al., 1990)
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* 71.6% (E)-anethole
* 14.6% foeniculin
* 5.0% methyl chavicol
* 1.4% limonene
* 0.6% linalool
* 0.6% nerolidol (unknown isomer)
* 0.5% anisaldehyde
* 0.5% (E,E)-α-farnesene
* 0.4% β-caryophyllene
* 0.4% (Z)-β-ocimene
* 0.2% myrcene
* 0.2% cinnamyl acetate
* 0.2% α-phellandrene
* 0.2% α-terpineol
* 0.1% para-cymene
* 0.1% α-terpinene
* 0.1% (E)-β-ocimene
* trace camphene
* trace α-pinene
* trace sabinene
* trace β-pinene
* trace δ-3-carene
* trace γ-terpinene
* trace terpinolene
* trace α-copaene
* trace (Z)-anethole
* trace methyl anisate
* 96.7% total
</div>
==Adulterations and substitutes==