Method for malting barley and improved malt thus obtained

Details Method for malting barley and improved malt thus obtained Method for malting barley and improved malt thus obtained

C - Chemistry, Metallurgy

12

C

C12C 1/00 (2006.01) C12C 1/047 (2006.01)

Patent

CA 2221052

The object of the invention is a method for malting barley, including a mashing step, a germinating step and a kiln drying step. In order to obtain a low level of nitrosodimethylamine (NDMA) in the malt after the kiln drying step, while avoiding the addition of sulphur during said step, the mashed barley is acidified at a stabilised pH of 3.5 to 4.6 during at least one mashing sub-step. The technique used includes reducing the dimethylamine (DMA) in the green malt, which limits the subsequent production of nitrosamines in the malt. An improved malt is further described, which contains 81-82 % of extract and 4-5 % of soluble proteins and has a viscosity of 1.4-1.5 mPas, a mellowness homogeneity > 72 %, an NMDA content < 1 % and a soluble .beta.-glucan content < 200 mg.

La présente invention a pour objet un procédé de maltage d'orge, comportant une étape de trempe, une étape de germination et une étape de touraillage. Pour obtenir un faible taux de nitrosodiméthylamine (NDMA) dans le malt après touraillage, tout en évitant l'addition de soufre au touraillage, l'orge en trempe est acidifiée à un pH stabilisé compris entre 3,5 et 4,6 au cours d'au moins une sous-étape de trempe. Le mécanisme mis en oeuvre est la réduction dans le malt vert de la Diméthylamine (DMA), ce qui limite la production ultérieure de nitrosamines dans le malt. L'invention concerne également un malt amélioré comprenant entre 81 % et 82 % d'extrait, un taux de protéines solubles compris entre 4 % et 5 %, une viscosité comprise entre 1,4 et 1,5 mPas, une homogénéité de modification > 72 % et un taux de NDMA < 1 %, et un taux de .beta.-glucanes solubles < 200 mg.

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