Pressing is a method of extracting tea oil from Camellia oleifera seeds by physical pressing, which originated from the traditional workshop oil-making method and is a traditional extraction process.
Leaching method is based on the principle of solvent extraction, which uses food-grade solvent to extract tea oil from Camellia oleifera seeds.
Water substitution method, "water substitution method" is the abbreviation of replacing oil with water, and there is no need for pressure pressing or solvent leaching. Under certain conditions, the affinity between water and protein is greater than that between oil and protein, so water infiltrates into oil to replace oil.
Supercritical CO2 extraction, that is, supercritical fluid leaching technology, is a method to obtain components from fluid or solid materials with supercritical fluid as solvent under critical temperature and pressure conditions. The commonly used supercritical solvent is CO2.
Subcritical extraction method: Subcritical extraction refers to low-temperature leaching and normal-temperature desolventization. Butane or a mixture of butane and propane is used as a solvent, which has a low boiling point, is gaseous at room temperature and is volatile.
Extended data
Camellia oil is suitable for storage in a cool, dry and dark place, and the optimum temperature is 10-25℃. There will be milky white flocculent crystals at low temperature, which is a normal phenomenon and will not affect eating. It will disappear naturally when the outside temperature is high (note: refined camellia oil will not have this phenomenon after freezing treatment). Because camellia oil contains a lot of antioxidants, the shelf life can be as long as two years at room temperature, which is much longer than that of ordinary edible oil.
After each use, the bottle cap should be tightened to reduce the contact time with air. Camellia oil should be sealed well, and the lid must be tightly tightened to seal tightly. Moreover, it is necessary to minimize the number of times of opening the cover to avoid camellia oil from being oxidized due to excessive contact with air.