Isolation,identification and control of molds on the surface of medium-high-temperature Daqu
In order to control the growth of molds on the surface of Daqu,on the basis of the original Daqu-making process,the key control points in the production of Daqu were reasonably adjusted,and mold strains were isolated from the surface of the Daqu and then identified.At the same time,the effects of the spacing between Anqu,mulch,first Fanqu time,and molds wiping on the growth,of mold on the surface of Daqu,and on the sensory,physicochemical indexes of Daqu were studied,and the measures to control the growth of molds on the surface of medium-high temperature Daqu in winter and spring were explored.The results showed that a fungus strain L1 was isolated and purified from the surface of Daqu,and it was identified as Rhizopus arrhizus.On the basis of the original Daqu-making process,the spacing between the Daqu was maintained at 2.0-2.5 cm,the straw with a thickness of 12-15 cm was selected as the mulch,and the first Fanqu time was 3 d after Anqu.Under these control conditions,the mold growth area on the surface of the Daqu could be reduced to 50％,the length was controlled to about 2 mm.The mold wiping was operated during the first time Fanqu.Results showed that the cross-sectional hyphae were more pronounced and full,the indexes of saccharification power and esterification power were slightly increased,which were 783.3 mg/(g·h)and 643 mg/(25 g·7 d),respectively.The research had certain reference significance for the sta-bility and improvement of the quality of medium-high-temperature Daqu.
medium-high-temperature Daqumoldisolation and identificationcontrol measures
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