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Potential of Zymomonas mobilis as an electricity producer in ethanol production
Biotechnology for Biofuels ( IF 6.3 ) Pub Date : 2020-03-05 , DOI: 10.1186/s13068-020-01672-5
Bo-Yu Geng 1 , Lian-Ying Cao 1 , Feng Li 2 , Hao Song 2 , Chen-Guang Liu 1 , Xin-Qing Zhao 1 , Feng-Wu Bai 1
Affiliation  

Microbial fuel cell (MFC) convokes microorganism to convert biomass into electricity. However, most well-known electrogenic strains cannot directly use glucose to produce valuable products. Zymomonas mobilis, a promising bacterium for ethanol production, owns special Entner–Doudoroff pathway with less ATP and biomass produced and the low-energy coupling respiration, making Z. mobilis a potential exoelectrogen. A glucose-consuming MFC is constructed by inoculating Z. mobilis. The electricity with power density 2.0 mW/m2 is derived from the difference of oxidation–reduction potential (ORP) between anode and cathode chambers. Besides, two-type electricity generation is observed as glucose-independent process and glucose-dependent process. For the sake of enhancing MFC efficiency, extracellular and intracellular strategies are implemented. Biofilm removal and addition of c-type cytochrome benefit electricity performance and Tween 80 accelerates the electricity generation. Perturbation of cellular redox balance compromises the electricity output, indicating that redox homeostasis is the principal requirement to reach ideal voltage. This study identifies potential feature of electricity activity for Z. mobilis and provides multiple strategies to enhance the electricity output. Therefore, additional electricity generation will benefit the techno-economic viability of the commercial bulk production for biochemicals or biofuels in an efficient and environmentally sustainable manner.

中文翻译:

运动发酵单胞菌在乙醇生产中作为电力生产者的潜力

微生物燃料电池(MFC)召集微生物将生物质转化为电能。然而,大多数知名的产电菌株不能直接使用葡萄糖来生产有价值的产品。运动发酵单胞菌是一种很有前途的乙醇生产细菌,具有特殊的 Entner-Doudoroff 途径,产生的 ATP 和生物量较少,并且具有低能耦合呼吸,使运动发酵单胞菌成为潜在的外产电原。通过接种运动发酵单胞菌构建消耗葡萄糖的 MFC。功率密度为 2.0 mW/m2 的电能来自阳极室和阴极室之间的氧化还原电位 (ORP) 差。此外,两种类型的发电被观察为葡萄糖非依赖性过程和葡萄糖依赖性过程。为了提高 MFC 效率,实施了细胞外和细胞内策略。生物膜去除和 c 型细胞色素的添加有利于电力性能,Tween 80 加速发电。细胞氧化还原平衡的扰动会损害电力输出,表明氧化还原稳态是达到理想电压的主要要求。本研究确定了运动发酵单胞菌电力活动的潜在特征,并提供了多种提高电力输出的策略。因此,额外的发电量将有利于以高效和环境可持续的方式商业化批量生产生物化学品或生物燃料的技术经济可行性。表明氧化还原稳态是达到理想电压的主要要求。本研究确定了运动发酵单胞菌电力活动的潜在特征,并提供了多种提高电力输出的策略。因此,额外的发电量将有利于以高效和环境可持续的方式商业化批量生产生物化学品或生物燃料的技术经济可行性。表明氧化还原稳态是达到理想电压的主要要求。本研究确定了运动发酵单胞菌电力活动的潜在特征,并提供了多种提高电力输出的策略。因此,额外的发电量将有利于以高效和环境可持续的方式商业化批量生产生物化学品或生物燃料的技术经济可行性。
更新日期:2020-04-22
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