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Author:
Date:
2017-05-05
[Abstract] Succinate and lactate are commodity chemicals used for producing bioplastics. Recently, it was found that such organic acids are excreted from cells of the unicellular cyanobacterium Synechocystis sp. PCC 6803 under dark, anaerobic conditions. To conduct the dark, anaerobic incubation, cells were concentrated within a vial that was then sealed with a butyl rubber cap, following which N2 gas was introduced into the vial. The organic acids produced were quantified by high-performance liquid chromatography via post-labeling with bromothymol blue as a pH indicator. After separation by ion-exclusion chromatography, the organic acids were identified by comparing their retention time with that of standard solutions. These procedures allow researchers to quantify the organic ...
[摘要] 琥珀酸盐和乳酸盐是用于生产生物塑料的商品化学品。最近发现这样的有机酸从单细胞蓝细菌集胞藻的细胞中排出。 PCC 6803在黑暗，无氧条件下。为了进行黑暗的厌氧培养，将细胞浓缩在小瓶内，然后用丁基橡胶帽密封，随后将N 2气体引入小瓶中。通过用溴百里酚蓝作为pH指示剂的后标记，通过高效液相色谱定量产生的有机酸。通过离子排阻色谱分离后，通过将其保留时间与标准溶液的保留时间进行比较来鉴定有机酸。这些程序允许研究人员量化微生物产生的有机酸，有助于蓝藻生物学和生物技术的知识。
背景 蓝细菌是一组进行氧合光合作用的细菌。集胞藻 sp。 PCC 6803（以下称为集胞藻6803）是非固氮，单细胞蓝细菌，通常用于基础和应用研究。集胞藻6803细胞能够在黑暗和厌氧条件下分泌有机酸，如琥珀酸盐和乳酸盐（Osanai等，2015）。培养条件的遗传操作和修饰，例如添加钾或NaHCO 3，成功地提高了从集胞藻6803细胞排出的有机酸的水平（Osanai >等人，2015; Hasunuma等人，2016; Iijima等人，2016; Ueda等人。 ...
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