Abstract: A process for the isolation of active proteins from plant material or from fermentation media, wherein the active proteins contained in an enzymatic solution extracted from the plant material or from the fermentation media are precipitated in an appropriate organic solvent, continuously and in a single step in a specific reactor, the conditions in the reactor being adjusted so as to obtain a precipitate of nondenatured proteins. The precipitate is then passed through a maturation step before being continuously separated.

Abstract: Process for the preparation of a vegetable juice or puree in which at least one fresh vegetable is homogenized in the presence of water, where appropriate under an inert atmosphere, so as to release the flavor precursors and part of the endogenous enzymes, the homogenate is incubated at a temperature of between 0.degree. C. and 70.degree. C. for 5 min to 24 h, it is processed, where appropriate, into juice or puree, and then it is pasteurized. Cooked juice or puree derived from unblanched vegetables, capable of being obtained by the process, having an enhanced raw flavor, and a natural color which is better preserved than that of the same cooked juice or puree derived from blanched vegetables. Use of a juice or puree, or of a dry extract of juice or puree in the preparation of a food product.