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首页> 外文期刊>Applied Microbiology and Biotechnology >Batch fermentations on synthetic mixed sugar and starch medium with amylolytic lactic acid bacteria
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Batch fermentations on synthetic mixed sugar and starch medium with amylolytic lactic acid bacteria

机译：带有淀粉分解乳酸菌的合成糖和淀粉混合培养基分批发酵

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摘要

The green crop drying industry in Denmark uses Italian rye grass, clover, and alfalfa as raw materials for the production of green pellets. The green crop drying industry solves its energy economical problems by heating and pressing of the green crop before drying. The produced sidestream is called brown juice. Brown juice was shown to be an excellent medium for lactic acid fermentation. The aim of this study was to investigate the utilisation of brown juice in the production of polylactic acid, where wheat starch would be added to increase the lactic acid yield and, thus, the feasibility of the process. A number of amylolytic lactic acid bacteria have been identified, and in this work, six different strains were tested for their ability to produce α-amylase and to utilise all sugars with high lactic acid yield in a medium with a complex composition of free sugars (brown juice) and starch. Lactobacillus plantarum A6 was the only strain that showed both a good lactic acid production and utilisation of starch in this medium. The growth rate of this strain was approximately 0.4 h−1 and the lactic acid yield was 0.7.
机译：丹麦的绿色农作物干燥工业使用意大利黑麦草，三叶草和苜蓿作为生产绿色颗粒的原料。绿色农作物干燥工业通过在干燥之前对绿色农作物进行加热和加压来解决其能源经济问题。产生的侧流称为棕汁。棕色果汁被证明是乳酸发酵的极佳培养基。这项研究的目的是研究棕色汁在聚乳酸生产中的利用，其中添加小麦淀粉以提高乳酸产量，从而提高该工艺的可行性。已经鉴定出许多淀粉分解乳酸菌，并且在这项工作中，测试了六种不同菌株在具有复杂游离糖成分的培养基中产生α-淀粉酶并利用乳酸产量高的所有糖的能力（棕色果汁）和淀粉。植物乳杆菌A6是唯一在该培养基中显示出良好的乳酸产生和淀粉利用的菌株。该菌株的生长速率约为0.4 h-1 ，乳酸产量为0.7。

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