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高产降脂活性物质的红曲霉选育及应用
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摘要
对收集的红曲霉菌株进行筛选,得到一株Monacolin K产量较高的红曲霉菌株M_9,其产量为15.82 μg/ml。以此菌株为原始出发菌株,孢子通过紫外、紫外—盐酸羟胺、紫外—LiCl、HNO_2、HNO_2—盐酸羟胺和HNO_2—LiCl复合诱变,得到突变株M_(9x),其Monacolin K产量为25.32 μg/ml,较出发菌株提高了60%。
     对突变株M_(9x)的原生质体制取及其原生质体再生进行了探索。其原生质形成和再生最佳条件为:以豆芽汁培养液为菌丝培养基,采用60h菌龄的菌丝体,以0.6MMgSO_4作为渗稳剂,用1.5%混合酶(蜗牛酶:纤维素酶=7:3)在30℃处理2h,原生质体形成数可以达到1.61×10~7个/ml,再生率为8.49%。
     采用He-Ne激光诱变突变株M_(9x)原生质体,获得一株Monacolin K产量为103.73 μg/ml的突变株M_(9y),其产量约是原始出发菌株M_9的6.6倍,经酯酶同工酶分析,其酶带条纹数、迁移率等均发生了明显变化。
     以突变株M_(9y)、米曲霉A_1为菌种,用大米、豆粕、麸皮等为原料,分别进行单菌种及混合菌种制曲,制曲成熟后,并对其进行发酵。结果表明:可用大米、豆粕为原料培养突变株M_(9y)。米豆比例1.5:1最佳。在制曲过程中对两种工艺进行了酶学研究,混合制曲能显著提高中性蛋白酶的活力。酸性蛋白酶及糖化酶活力也有不同程度的提高。同时对两种发酵产品进行了比较:混合菌种制曲发酵工艺酿制的新型调味品,在氨基酸态氮生成率、感官及理化指标等方面均优于单菌种制曲混合发酵工艺所酿制的调味品。最后测定了混合菌种制曲发酵工艺酿制的调味品中的Monacolin K含量,其含量为21.56 μg/ml。
The collected Monascus strains were screened, a strain named Monascus sp. with high productivity of Monacolin K was obtained, whose yield reached 15.82μ/ml. Monascus sp. M9 was used as the original strain, whose spores were treated with ultraviolet ultraviolet-NH2HO ·HC1. ultraviolet-LiC1. HNO2. HNO2-NH2HO ·HC1 and HNC2-LiCl. A mutant strain named Monascus sp. M9x was gained, whose yield of Monacolin K increased 60% in comparison with the original strain, reaching 25.32μ /ml.
    Next, the paper focused on the formation and regeneration of the protoplast from Monascus sp. M9x. The results showed that the soybean sprout juice was used to culture mycelium and the mycelium age of 60h was used as operated material were easy to form protoplast. Under the action of 1.5% mixed enzyme (Snail enzyme: Cellulose enzyme =7:3) with 0.6M MgSo4 sucrose used as osmotic stabilizer, the protoplasts reached 1.61 ×10~7/ml, and the regeneration rate was 8.49%.
    A mutant strain called Monascus sp. M9y was achieved using irradiating protoplasts by He-Ne laser (632.8nm). Its yield of Monacolin K increased as much as 6.6 times than that of the original strain, which was 103.73μ/ml. The esterase (EST) isoenzyme electropheresis bands of the mutant strain Monascus sp. M9y compared with that of the original strain changed dramatically.
    Monascus sp. M9y and Aspergillus Oryzae A1 were adopted as culture strains. Rice. soybean chips and wheat bran were used as raw materials. Single stain and mixed strains were cultured respectively on them. Immediately, they were fermented after maturing. Results showed that Monasucus sp. M9y can be cultured employing riee and soybean chips. The optimum proportion was 1.5: 1. By study on the enzymes of the two culture technologys in the course of culture, results showed that the'mixed strains culture technology can increase the activity of neutral protease remarkably, at the same time the activities of acid protease and saccharifying enzyme were raised in different degree, comparing with the single strain culture technology.
    
    
    
    The new condiment was produced by fermenting the mature koji produced with mixed strains culture technology. The other was produced by fermenting the mature koji produced with single strain culture. By comparing the two condiments, the former was better than the latter in amino acid nitrogen producing rate. frems of sense. and physical & chemical index. And the contend of Monacolin K in the former was21.52/ml.
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