Table 4.

Physicochemical properties of Camellia seed oil extracted by continuous subcritical n-butane fluid extraction

Physicochemical indexes	Camellia seed oil extracted by continuous subcritical n-butane fluid	National standard of a first-class solvent extraction oil (China)
Iodine value (gI/100 g)	83.20 ± 0.21	≤85
Saponification value (mg KOH/g)	154.81 ± 2.00	≤185
Refractive index (25 °C)	1.46 ± 0.06	1.460–1.464
Freezing point (°C)	−8.00 ± 0.10	−5 to −10
Unsaponifiable matter (g/kg)	5.00 ± 0.40	≤15
Refrigeration test (0 °C, 5.5 h)	Clear, transparent	Clear, transparent
Smoking point (°C)	215.00 ± 1.00	≥215
Acid value (KOH mg/g)	1.24 ± 0.03	≤0.25