1
|
Li P, Wang M, Di H, Du Q, Zhang Y, Tan X, Xu P, Gao C, Jiang T, Lü C, Ma C. Efficient production of 1,2,4-butanetriol from corn cob hydrolysate by metabolically engineered Escherichia coli. Microb Cell Fact 2024; 23:49. [PMID: 38347493 PMCID: PMC10863244 DOI: 10.1186/s12934-024-02317-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 01/25/2024] [Indexed: 02/15/2024] Open
Abstract
Corn cob is a major waste mass-produced in corn agriculture. Corn cob hydrolysate containing xylose, arabinose, and glucose is the hydrolysis product of corn cob. Herein, a recombinant Escherichia coli strain BT-10 was constructed to transform corn cob hydrolysate into 1,2,4-butanetriol, a platform substance with diversified applications. To eliminate catabolite repression and enhance NADPH supply for alcohol dehydrogenase YqhD catalyzed 1,2,4-butanetriol generation, ptsG encoding glucose transporter EIICBGlc and pgi encoding phosphoglucose isomerase were deleted. With four heterologous enzymes including xylose dehydrogenase, xylonolactonase, xylonate dehydratase, α-ketoacid decarboxylase and endogenous YqhD, E. coli BT-10 can produce 36.63 g/L 1,2,4-butanetriol with a productivity of 1.14 g/[L·h] using xylose as substrate. When corn cob hydrolysate was used as the substrate, 43.4 g/L 1,2,4-butanetriol was generated with a productivity of 1.09 g/[L·h] and a yield of 0.9 mol/mol. With its desirable characteristics, E. coli BT-10 is a promising strain for commercial 1,2,4-butanetriol production.
Collapse
Affiliation(s)
- Ping Li
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China
- Bloomage Biotechnology Corporation Limited, 678 Tianchen Street, Jinan, 250101, China
| | - Mengjiao Wang
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China
| | - Haiyan Di
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China
| | - Qihang Du
- Shandong Institute of Metrology, Jinan, 250014, China
| | - Yipeng Zhang
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Xiaoxu Tan
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Chao Gao
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China
| | - Tianyi Jiang
- School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, 250101, China
| | - Chuanjuan Lü
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China.
| | - Cuiqing Ma
- State Key Laboratory of Microbial Technology, Shandong University, NO.72 Binhai Road, Qingdao, 266237, China.
| |
Collapse
|
2
|
Investigation of the Effects of Torrefaction Temperature and Residence Time on the Fuel Quality of Corncobs in a Fixed-Bed Reactor. ENERGIES 2022. [DOI: 10.3390/en15145284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Biomass from agriculture is a promising alternative fuel due to its carbon-neutral feature. However, raw biomass does not have properties required for its direct utilization for energy generation. Torrefaction is considered as a pretreatment method to improve the properties of biomass for energy applications. This study was aimed at investigating the effects of torrefaction temperature and residence time on some physical and chemical properties of torrefied corncobs. Therefore, a fixed-bed torrefaction reactor was developed and used in the torrefaction of corncobs. The torrefaction process parameters investigated were the torrefaction temperature (200, 240, and 280 °C) and the residence time (30, 60, and 90 min). The effects of these parameters on the mass loss, grindability, chemical composition, and calorific value of biomass were investigated. It was shown that the mass loss increased with increasing torrefaction temperature and residence time. The grinding throughput of the biomass was improved by increasing both the torrefaction temperature and the residence time. Torrefaction at higher temperatures and longer residence times had greater effects on the reduction in particle size of the milled corncobs. The calorific value was highest at a torrefaction temperature of 280 °C and a residence time of 90 min. The energy yield for all treatments ranged between 92.8 and 99.2%. The results obtained in this study could be useful in the operation and design of torrefaction reactors. They also provided insight into parameters to be investigated for optimization of the torrefaction reactor.
Collapse
|