Related Experiment Video
Updated: Nov 28, 2025
10:18
Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
Published on: January 7, 2019
21.5K
Polyhydroxyalkanoate synthesis and characterization: A proteogenomic and process optimization study for
Raj Morya1, Aditi Sharma1, Madan Kumar2
1School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Bioresource Technology
|November 28, 2020
Summary
This study shows Burkholderia sp. ISTR5 efficiently produces polyhydroxyalkanoates (PHA), a bioplastic, using lignin substrates. Optimization significantly increased PHA yield and biomass, demonstrating potential for sustainable biopolymer production.
Area of Science:
- Microbiology
- Biotechnology
- Polymer Science
Background:
- Lignin, a byproduct of the paper industry, is an abundant and renewable carbon source.
- Polyhydroxyalkanoates (PHAs) are biodegradable polyesters with diverse applications.
- Efficient microbial production of PHAs from low-cost feedstocks is crucial for economic viability.
Purpose of the Study:
- To investigate the potential of Burkholderia sp. ISTR5 for PHA production using Kraft lignin (KL) and lignosulfonate (LS).
- To optimize PHA production using Response Surface Methodology (RSM).
- To characterize the produced PHA and assess its biodegradability.
Main Methods:
- Screening of Burkholderia sp. ISTR5 on KL and LS for PHA production.
- Optimization of PHA production using Box-Behnken Design (BBD) under RSM.
- Characterization of PHA using GC-MS, TEM, FTIR, NMR, and fluorescence microscopy.
- Assessment of PHBV degradation by strain R5.
- Genomic and proteomic analysis of strain R5.
Main Results:
- Initial screening yielded maximum PHA mass fractions of 23% on KL and 18% on LS.
- Optimization via BBD-RSM resulted in a 42.5% increase in PHA production and a 32.2% increase in cell biomass.
- The produced PHA was identified as a small chain length copolymer, poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV).
- Strain R5 completely degraded PHBV within 120 hours.
- Genomic and proteomic analyses identified enzymes involved in lignin metabolism and PHA production.
Conclusions:
- Burkholderia sp. ISTR5 is a promising microorganism for PHA production from lignin-based substrates.
- Optimization strategies significantly enhance PHA yield and biomass.
- The strain produces PHBV, a valuable biopolymer, and can also degrade it.
- The identified enzymes suggest a robust metabolic pathway for utilizing lignin for PHA synthesis.
