DMS Change And Influence Factor In The Process Of Malting

In the experiment, common PEG capillary column and FID were used to detect SMMduring the germination of different barleys, meanwhile, activity of protease and relativeindexes of barleys that the difference among the varieties was larger were also detected duringthe germination.The results showed that SMM content of Domestic barleys was in higherlevels compared with that of Cervoise during germination, Domestic barleys made theprotease activity, soluble nitrogen and total nitrogen content higher than that of Cervoise, butextract fine grind and α-amino nitrogen was lower than that of Cervoise.In order to further understand the process of SMM and DMS in malt, and providereference for optimize malting technology, In this paper, based on the formation mechanism,from the three stages of steeping, germination and kilning, we explored related enzymeactivity and the relevant indicators. The results showed the steeping water is acidic or alkalinefor the germination of SMM has a different degree of inhibition, the more steeping water ofacidic or alkaline the more intense, the greater inhibition of the germination of SMM, Baptistthe barleys added metal ions in steeping water has little impact for the germination of SMM.In the process of germination, the SMM in the barleys in the growth, especially in themid-germination more significantly; the end of germination, the SMM in the shoot and leafbud was significantly higher than other components; In the germination of stage, proteinaseactivity is similar to the content of methionine and SMM.Kilning early, SMM is continuing to form. In the kilning process, DMS production andthe formation of SMM had little to do with the extract fine grind, total nitrogen and solublenitrogen, but had a close relationship with α-amino nitrogen; DMS mainly formed in theextracellular, the volatilization of DMS is relation with exposure surface area; at key stage ofDMS generated,(75℃,kilning ending), DMS and water content was negatively correlated.The formation and volatilization of DMS and the formation of SMM has close to water.