Method for preparing high-purity gardenia yellow pigment

A method for preparing a gardenia yellow pigment, characterized in that the method comprises the following steps:

• taking gardenia fruits, washing the gardenia fruits 3-5 times using ultrapure water, then placing the gardenia fruits in a blast drying oven at 40° C. for 45 hours, after drying, grinding the gardenia fruits into 100-mesh gardenia dry powder using a B-type universal pulverizer, performing degrease and impurity removal treatment on the gardenia dry powder, and setting aside;
• pre-formulating a pigment carrier, and combining the pre-formulated pigment carrier with the gardenia dry powder using a supercritical fluid extraction to obtain a crude pigment extract, removing the pigment carrier from the crude pigment extract using rotary evaporation, adding an equal volume of ultrapure water to the crude pigment extract to obtain a crude pigment solution;
• and
• preparing a pigment adsorption resin, and loading the prepared pigment adsorption resin onto a column by wet packing, loading the crude pigment extract onto the column for adsorption, and eluting with a 45% ethanol solution to obtain a gardenia yellow pigment solution that contains the gardenia yellow pigment.