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Electrofiltration as a purification strategy for microbial poly-(3-hydroxybutyrate).

Gözde Gözke¹, Carolin Prechtl, Frank Kirschhöfer

¹Institute of Process Engineering in Life Sciences, Bioprocess Engineering, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, Build. 30.44, D-76131 Karlsruhe, Germany. goezde.goezke@kit.edu

Bioresource Technology

|September 4, 2012

Summary

Electrofiltration efficiently purifies poly-(3-hydroxybutyrate) (PHB), a biodegradable polyester, by leveraging its natural protein coating. This method offers a significant concentration improvement over traditional filtration without altering PHB structure.

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Area of Science:

Biotechnology
Polymer Science
Separation Technology

Background:

Poly-(3-hydroxybutyrate) (PHB) is a biodegradable polyester produced by Ralstonia eutropha.
Downstream processing of PHB often involves complex and costly purification steps.
The protein film on PHB granules imparts a high negative zeta potential, suggesting potential for electrophoretic separation.

Purpose of the Study:

To investigate electrofiltration as an integrated downstream processing technology for PHB.
To determine optimal electrofiltration parameters (pressure, electric field strength) for PHB purification.
To assess the impact of electrofiltration on the structural integrity of PHB.

Main Methods:

PHB was produced using Ralstonia eutropha in batch and fed-batch cultures.
Electrofiltration was applied for PHB purification under various pressure and electric field conditions.
FT-Raman spectroscopy was used to analyze the structural integrity of the purified PHB.

Main Results:

Electrofiltration achieved up to a four-fold higher concentration factor compared to conventional filtration.
Optimal parameters were identified as 4 bars and 4 V/mm electric field strength.
FT-Raman spectroscopy confirmed no structural alterations in PHB post-electrofiltration.

Conclusions:

Electrofiltration is an efficient and practical downstream processing technology for PHB.
The high negative zeta potential of PHB granules facilitates effective electrofiltration.
This method presents significant advantages for industrial-scale PHB purification.