低产桔霉素红曲霉菌种筛选

对部分红曲霉菌种的液态发酵液和固态红曲米中桔霉素质量分数进行了测定 ,从中筛选了数株低产桔霉素的红曲霉菌种 ,重点对红曲霉ZK0A菌种生产的红曲米的色价及桔霉素质量分数进行了测定 .连续培养 3批该菌种 ,所生产的红曲米色价高于 10 0 0U / g ,桔霉素质量分数低于5mg/kg.而另一株红曲霉ZH 12生产的红曲米 (色价 170 0U/ g)中桔霉素质量分数则高达 1g/kg以上 .对这两株红曲霉菌种的菌落形态进行了鉴定 ,初步认定这两株菌种都是紫色红曲霉 .

Screening of Monascus Strains with Low Content Citrinin Production Ability

Several Monascus strains with low citrinin production ability were screened. The citrinin contents in liquid (shaking flasks) and solid state cultivation (red rice) by some selected Monascus strains were determined. The pigments and citrinin production properties by the strain of Monascus sp. ZK?0A were investigated, and it was found that this strain produced moderate amount of pigments (above 1 000 U/g) and less amount of citrinin ( below 5 mg/kg) in the three batches of solid state cultivation experiments. The low citrinin producer, Monascus sp .ZK?0A and the high citrininproducer, Monascus sp.ZH?12 (color value of its red rice is 1 750 U/g)were identified to be the same species of Monascus purpureus, according to morphological characters and growth in MEA medium of the strain, but had small difference in the colony appearance.