1. Polarity of representative components according to essential oil [19,21,23–25]
Sample | Component | Polarity |
---|---|---|
Pine needles | β-pinene | Nonpolar |
Bornyl acetate | Polar | |
Twigs | β-phellandrene | Nonpolar |
Citronellol | Polar | |
Bark | Catechin | Polar |
Caffeic acid | Polar |