基于工程化盐单胞菌TDZI-08一锅法合成衣康酸

One-pot synthesis of itaconic acid by engineered Halomonas bluephagenesis TDZI-08

摘要:

衣康酸(itaconic acid, IA)是12种高附加值平台化合物之一，广泛应用于涂料、黏合剂、塑料、树脂和生物燃料等领域。本研究基于前期构建的工程化盐单胞菌TDZI-08，通过排查阻碍因素、优化碳源、氮源、诱导剂添加时间和表面活性剂添加量等，建立了一锅法催化柠檬酸合成衣康酸工艺。在5 L发酵罐中利用TDZI-08进行开放式不灭菌一锅法合成，最高产生了40.50 g/L衣康酸，催化阶段得率为0.68 g衣康酸/g柠檬酸，总得率为0.42 g衣康酸/g (柠檬酸+葡萄糖酸)。本研究探索出的一锅法合成体系工艺简单且无须灭菌和无菌操作，表明盐单胞菌具有较好的衣康酸工业化生产潜力。

关键词:盐单胞菌;衣康酸;一锅法合成;工艺优化

Abstract:

Itaconic acid (IA) is one of the twelve high value-added platform compounds applied in various fields including coatings, adhesives, plastics, resins, and biofuels. In this study, we established a one-pot catalytic synthesis system for IA from citric acid based on the engineered salt-tolerant bacterial strain Halomonas bluephagenesis TDZI-08 after investigating factors that hindered the process and optimizing the carbon source, nitrogen source, inducer addition time, and surfactant dosage. The open, non-sterile, one-pot synthesis with TDZI-08 in a 5 L fermenter achieved the highest IA titer of 40.50 g/L, with a catalytic yield of 0.68 g IA/g citric acid during the catalytic stage and a total yield of 0.42 g IA/g (citric acid+gluconic acid). The one-pot synthesis system established in this study is simple and does not need sterilization or aseptic operations. The findings indicate the potential of H. bluephagenesis for industrial production of IA.

Key words:Halomonas bluephagenesis;itaconic acid;one-pot synthesis;process optimization