The invention discloses preparation of high-hydrophilcity macroporous absorption resin and a method for removing
caffeine in crude tea extracts. A method for preparing the resin comprises the steps of: dissolving
gelatin or
polyvinyl alcohol in water to prepare an aqueous phase, mixing TAIC (
triallyl isocyanurate) and VAc to form a polymeric
monomer, adding long-chain aliphatic paraffins of C7-C12 as a porogenic agent and adding AIBN (azo-bis-isobutyronitrile) as an initiator to form an
oil phase for
polymerization; mixing the aqueous phase with the
oil phase, stirring and heating, filtering out resin, washing the resin with deionized water and
drying; and mixing the dried resin with a
sodium hydroxide aqueous solution, stirring and heating for reaction, standing for cooling to
room temperature after the reaction to prepare the high-hydrophilcity macroporous absorption resin. By using the high-hydrophilcity macroporous absorption resin for separating commercial crude tea extracts, the
caffeine in the crude tea extracts can be completely eliminated only through a simple continuous process including adsorption and
elution in one step, and the yield of tea
polyphenol is more than 90%. The process for removing the
caffeine is simple to operate and is free from the application of toxic solvents, the resin is recyclable, the production cost is low, and the method is particularly suitable for large-scale industrial production.