A method for isolating a bioactive fraction that comes from cellular juice from a Theacea plant, said procedure comprising: providing fresh biomass from a Theacea plant, wherein said fresh biomass comprises fresh Theacea plant biomass that has not undergone any conventional tea processing ； separating the fresh biomass from the Theacea plant into cellular juice and a cell wall component, in which said separation comprises grinding, macerating and pressing the fresh biomass to separate the fresh biomass into the cell juice and the cell wall component； treating the cell juice under effective conditions to produce a bioactive fraction, said conditions comprising subjecting the cell juice to microwave treatment to induce coagulation, thereby providing a coagulated membrane fraction and a non-coagulated portion of the cell juice, isolating the fraction bioactive of the coagulated membrane fraction, in which the bioactive fraction is the membrane fraction or an extract of the membrane fraction, in which the membrane fraction is isolated by separating the coagulated membrane fraction from the uncoagulated cell juice using centrifugation and, wherein the extract of the membrane fraction is isolated by subjecting the membrane fraction to solvent extraction with dimethylsulfoxide and then centrifugation to provide a supernatant comprising the extract of the membrane fraction.Un procedimiento para aislar una fracción bioactiva que proviene de jugo celular de una planta Theacea, comprendiendo dicho procedimiento: proporcionar biomasa fresca de una planta Theacea, en el que dicha biomasa fresca comprende biomasa de planta Theacea fresca que no ha sufrido ningún procesamiento de té convencional； separar la biomasa fresca de la planta Theacea en jugo celular y un componente de paredes celulares, en el que dicha separación comprende moler, macerar y prensar la biomasa fresca para separar la biomasa fresca en el jugo celular y el componente de paredes celulares； tratar el jugo celul
