Different quality oil-tea camellia seeds were pressed by twin screw pressing, single screw pressing and hydraulic pressing to produce oil, and the conventional indexes and micro-nutrient components of pressed oil-tea camellia seed oil were analyzed. The results showed that the quality of oil produced from high-quality oil-tea camellia seed by hydraulic pressing was obviously superior to the oils produced by the other two kinds of pressing methods. The quality of oil produced from ordinary oil-tea camellia seed by hydraulic pressing was slightly better. The qualities of three kinds of pressed oils from poor quality oil-tea camellia seeds were comparable. Among three kinds of oil pressing technologies, the lowest residual oil content in pressed cake was twin screw pressing, followed by single screw pressing, while the hydraulic pressing had the highest residual oil content in pressed cake. |