Table 1.
Most abundant phytochemicals characterized in oregano extract prepared by different extraction methods
| Extraction method or essential oil | Major phytochemicals | Citation |
|---|---|---|
| Essential oil | Carvacrol (14.5% total oil composition) β-fenchyl alcohol (12.8%) Thymol (12.6%) γ-terpinene (11.6%) δ-terpineol (7.5%) |
14 |
| Essential oil | Carvacrol (61.3% total oil composition) Thymol (13.9%) γ-terpinene (3.1%) 1,8-cineole (1.6%) Borneol (1.3%) |
25 |
| Essential oil | Carvacrol (not quantified) γ-terpinene Camphene 1-octen-3-ol β-caryophyllene |
28 |
| Supercritical CO2 | Carvacrol (not quantified) Cis-sabinene hydrate Linalyl acetate Trans-sabinene hydrate Thymol |
28 |
| Hydroalcoholic (methanol:water 80:20) |
Luteolin 7-O-glucoside (20.88 mg/g extract) Rosmarinic acid (14.62 mg/g) Luteolin O-glucuronide (12.48 mg/g) Apigenin 7-O-glucuronide (5.78 mg/g) Quercetin 3-O-rutinoside (3.71 mg/g) |
27 |
| Infusion (aqueous) | Luteolin O-glucuronide (26.50 mg/g extract) Luteolin 7-O-glucoside (22.93 mg/g) Rosmarinic acid (15.91 mg/g) Apigenin 7-O-glucuronide (8.24 mg/g) Kaempferide O-glucuronide (3.99 mg/g) |
27 |
| Decoction (aqueous) | Luteolin O-glucuronide (28.27 mg/g extract) Luteolin 7-O-glucoside (25.26 mg/g) Rosmarinic acid (15.42 mg/g) Apigenin 7-O-glucuronide (8.63 mg/g) Kaempferide O-glucuronide (3.97 mg/g) |
27 |
| Ethanol (70%) | Diacetone alcohol (32.18 mg/g dry weight) Rosmarinic acid (25.02 mg/g) Thymol (24.36 mg/g) n-heptanoic acid (17.06 mg/g) Luteolin 7-O-glucoside (10.08 mg/g) |
29 |
| Methanol (70%) | Diacetone alcohol (28.87 mg/g dry weight) Rosmarinic acid (28.42 mg/g) Thymol (16.29 mg/g) Nitro-L-argnine (15.93 mg/g) Luteolin 7-O-glucoside (13.53 mg/g) |
29 |