Study on physicochemical property changes of tea seed oil during refining process and selecting the refining conditions

This paper reported the selected refining conditions of tea seed oil and the main physicochemical property changed during refining process.The results showed that peroxide value decreased in decoloring process.The color and acid value changed during deodorization process.Components of the fatty acid were measured by gas chromatography,and it showed that two refining process,caustic refining and defatting,it had impacts on the fatty acid components in tea seed oil.Stearic acid decreased slightly in content after caustic refining,while palmitic acid content got remarkably decreasing in winterized oil.The optimum conditions for caustic refining were as follws:the temperature at 30℃and the concentrations of 18°B'e caustic soda and 0.2% extra caustic soda.The optimal condition for bleaching were as follws:the temperature at 100～110℃ for 25 minutes and the dose of bleaching clay 2.5%～3.0%.The deodorization temperature was suitable at 180℃,1h.Winterizing time requires at least 8h with temperature maintained within 6～8℃ for lipid crystallite forming.