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首页> 外文期刊>Applied Microbiology and Biotechnology >A bioreactor model system specifically designed for Tetrahymena growth and cholesterol removal from milk
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A bioreactor model system specifically designed for Tetrahymena growth and cholesterol removal from milk

机译:生物反应器模型系统,专门设计用于四膜虫的生长和牛奶中胆固醇的去除

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摘要

This work describes the configuration and operation of a bioreactor system especially designed for Tetrahymena cultivation and its use for milk improvement, particularly cholesterol elimination by the action of this cell. An advantage of the proposed method is the re-use of the growth medium; thus, the medium is used twice to provide two batches of Tetrahymena biomass without the need of further inoculation. This makes the procedure of producing the cell biomass faster and more economical. Cells are concentrated in the culture vessels by sedimentation at room temperature and then transferred to milk suspensions, where they can further grow for at least one generation with the benefit of reducing steeply cholesterol level. Milk treated according to this process is separated from the biomass by centrifugation. Under these conditions, less than 5% of the cells remain in the milk, and cholesterol elimination amounts to 75 +/- 10% of that initially present. No changes in sensorial properties of the milk, such as clotting or butyric odor, were observed as a result of this treatment. In addition, the bioreactor allows the aseptic recovery of the spent growth medium, which contains diverse enzymes of interest, and the cell pellets, to exploit particular lipids like phosphonolipids, abundant poly-unsaturated fatty acids and co-enzyme Q(8).
机译:这项工作描述了专为四膜虫栽培而设计的生物反应器系统的配置和操作,以及其用于牛奶改良,特别是通过该细胞的作用消除胆固醇的用途。所提出的方法的一个优点是可以重新使用生长培养基。因此,该培养基被用于两次以提供两批四膜虫生物质,而无需进一步接种。这使得生产细胞生物质的过程更快,更经济。通过在室温下沉淀将细胞浓缩在培养容器中,然后转移到牛奶悬浮液中,在那里它们可以进一步生长至少一代,具有降低胆固醇水平的优势。通过离心将根据该方法处理的牛奶与生物质分离。在这些条件下,牛奶中仅剩下不到5%的细胞,胆固醇的消除量相当于最初存在的胆固醇的75 +/- 10%。由于该处理,未观察到牛奶的感官特性变化,例如凝结或丁酸气味。此外,生物反应器可以无菌回收用过的生长培养基(其中含有各种目的酶)和细胞沉淀物,以开发特定的脂质,例如磷脂,丰富的多不饱和脂肪酸和辅酶Q(8)。

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