The invention provides a preparation method for a tea
polyphenol oil-soluble derivative used as an anti-oxidant for
edible oil. The preparation method is characterized by comprising the following steps: (1)
acylation reaction: a step of adding, by weight, 100 parts of tea
polyphenol, 50 to 500 parts of
acyl chloride and 0.05 to 10 parts of a catalyst into a reactor equipped with a stirrer, a
thermometer and a gas guiding-in and guiding-out opening, introducing
nitrogen, carrying out heating to 50 to 180 DEG C under stirring, then carrying out the reaction until a
system is uniform and transparent and then carrying out cooling to
room temperature; (2)
rearrangement reaction: a step of adding 10 to 400 parts by weight of a rearrangement aid into reactant, carrying out heating and stirring until the obtained mixture is solidified, placing the solidified mixture into a baking oven, maintaining the mixture at 100 to 180 DEG C for 0.5 to 5 h, then cooling the mixture to
room temperature, adding 100 to 1000 parts by weight of an acid /
aqueous solution with a pH value of less than 2 and 100 to 1000 parts by weight of an extracting agent, carrying out uniform stirring, removing a water phase and repeatedly washing an extracting agent phase five time by using the acid /
aqueous solution with a pH value of less than 2; and (3) reduction reaction: a step of adding 50 to 500 parts by weight of a
reducing agent /
aqueous solution with a concentration of 20% into a product obtained in the step (2), carrying out stirring for 5 to 72 h, washing the extracting agent phase with water until the extracting agent phase is neutral and removing the extracting agent so as to obtain the tea
polyphenol oil-soluble derivative.