Composition
Tea tree oil is defined by international standard ISO 4730 (2004) ("Oil of Melaleuca, Terpinen-4-ol type"), which specifies levels of 15 components which are needed to define the oil as "tea tree oil."
Among over 98 compounds contained in the oil, terpinen-4-ol is responsible for most of the antimicrobial activity.
| Component | Concentration |
|---|---|
| terpinen-4-ol | 30–48% |
| γ-terpinene | 10–28% |
| α-terpinene | 5–13% |
| 1,8-Cineole | 0–15% |
| α-terpinolene | 1.5–5% |
| α-terpineol | 1.5–8% |
| α-pinene | 1–6% |
| p-cymene | 0.5–8% |
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