Nestec S.a.

Jean-Luc Sauvageat

Eric Raetz

Sylviane Reymond

Pierre Nicolas

Tannase covalently immobilized by its glycoside part on an insoluble support. Process for the preparation of a tea extract, in which an aqueous extract of tea leaves is prepared, and the extract is treated at a temperature of 20-65.degree. C. with tannases whose glycoside part is covalently immobilized on an insoluble support, in particular in a tank which contains immobilized tannases in suspension, or in a reactor which includes a fixed bed or a fluidized bed of immobilized tannases.

Tea extract preparation

Hydrolysis of the galactomannans of a liquid coffee extract, in which this extract is hydrolyzed at a temperature of 20.degree.-80.degree. C. with immobilized beta-mannanases.

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Morges, Switzerland

Jean-Luc Sauvageat