Evaluation of aromatic funneling pathways in Azotobacter vinelandii
(2026) KMBM01 20261Applied Microbiology
Biotechnology
Biotechnology (MSc)
- Abstract
- Lignin is a major renewable carbon source that can be depolymerized into a diverse range of aromatic compounds. Efficient microbial conversion of these lignin-derived compounds (LDCs) is an important step toward sustainable biorefinery processes. In this study, the ability of two Azotobacter vinelandii strains to utilize selected LDCs was investigated through dynamic cultivation experiments. Growth behavior, substrate consumption, intermediate formation, and physiological responses were monitored using HPLC and UV–Vis spectroscopy. Both strains were able to consume several LDCs, although some differences in degradation efficiency were observed between substrates. UV–Vis measurements showed changes in absorbance at 410 nm with different... (More)
- Lignin is a major renewable carbon source that can be depolymerized into a diverse range of aromatic compounds. Efficient microbial conversion of these lignin-derived compounds (LDCs) is an important step toward sustainable biorefinery processes. In this study, the ability of two Azotobacter vinelandii strains to utilize selected LDCs was investigated through dynamic cultivation experiments. Growth behavior, substrate consumption, intermediate formation, and physiological responses were monitored using HPLC and UV–Vis spectroscopy. Both strains were able to consume several LDCs, although some differences in degradation efficiency were observed between substrates. UV–Vis measurements showed changes in absorbance at 410 nm with different LDCs, suggesting that certain LDCs may influence the siderophores production of A. vinelandii. The two strains also displayed distinct growth patterns. Overall, the findings suggest that A. vinelandii has potential as a whole-cell biocatalyst for lignin valorization and targeted biochemical production in future biorefinery processes. (Less)
- Popular Abstract
- Lignin is one of the most abundant renewable materials on Earth. It is found in plant biomass and is produced in large amounts as a by-product of forestry, paper, and agricultural industries. Despite its abundance, most lignin is still burned for energy rather than converted into higher-value products. One promising approach is to use microorganisms that can break down lignin-derived compounds and transform them into useful chemicals.
This project investigated whether the bacterium Azotobacter vinelandii can utilize compounds that are commonly released when lignin is broken down. Two strains of the bacterium were cultivated with a range of lignin-derived aromatic compounds, and their growth and substrate consumption were monitored over... (More) - Lignin is one of the most abundant renewable materials on Earth. It is found in plant biomass and is produced in large amounts as a by-product of forestry, paper, and agricultural industries. Despite its abundance, most lignin is still burned for energy rather than converted into higher-value products. One promising approach is to use microorganisms that can break down lignin-derived compounds and transform them into useful chemicals.
This project investigated whether the bacterium Azotobacter vinelandii can utilize compounds that are commonly released when lignin is broken down. Two strains of the bacterium were cultivated with a range of lignin-derived aromatic compounds, and their growth and substrate consumption were monitored over time. Chemical analyses were used to determine which compounds were consumed and whether intermediate products were formed during cultivation. The results showed that A. vinelandii could consume several lignin-derived compounds. However, not all compounds were equally suitable. The two bacterial strains behaved similarly in terms of which compounds they could consume, but one strain generally grew faster and reached higher cell densities.
Overall, this work improves our understanding of how A. vinelandii responds to lignin-derived compounds and identifies both strengths and limitations in its metabolism. The findings provide a foundation for future efforts to engineer this bacterium for sustainable biorefinery applications, helping transform plant waste into valuable products instead of simply burning it as fuel. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/student-papers/record/9236041
- author
- Chen, Mo LU
- supervisor
- organization
- course
- KMBM01 20261
- year
- 2026
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Azotobacter vinelandii, Lignin valorization, Biological funneling, Lignin-derived compounds, Siderophores, Biotechnology
- language
- English
- id
- 9236041
- date added to LUP
- 2026-08-11 09:01:57
- date last changed
- 2026-08-11 09:01:57
@misc{9236041,
abstract = {{Lignin is a major renewable carbon source that can be depolymerized into a diverse range of aromatic compounds. Efficient microbial conversion of these lignin-derived compounds (LDCs) is an important step toward sustainable biorefinery processes. In this study, the ability of two Azotobacter vinelandii strains to utilize selected LDCs was investigated through dynamic cultivation experiments. Growth behavior, substrate consumption, intermediate formation, and physiological responses were monitored using HPLC and UV–Vis spectroscopy. Both strains were able to consume several LDCs, although some differences in degradation efficiency were observed between substrates. UV–Vis measurements showed changes in absorbance at 410 nm with different LDCs, suggesting that certain LDCs may influence the siderophores production of A. vinelandii. The two strains also displayed distinct growth patterns. Overall, the findings suggest that A. vinelandii has potential as a whole-cell biocatalyst for lignin valorization and targeted biochemical production in future biorefinery processes.}},
author = {{Chen, Mo}},
language = {{eng}},
note = {{Student Paper}},
title = {{Evaluation of aromatic funneling pathways in Azotobacter vinelandii}},
year = {{2026}},
}