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Whole cell microbial transformation in cloud point system.

Zhilong Wang¹, Jian-He Xu, Daijie Chen

¹School of Pharmacy, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China. zlwang@sjtu.edu.cn

Journal of Industrial Microbiology & Biotechnology

|April 9, 2008

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Cloud point systems offer a novel medium for microbial transformations, enabling efficient in situ extraction and separation. This biocompatible system enhances downstream processing for biotechnological applications.

Area of Science:

Biotechnology
Biochemical Engineering
Surfactant Chemistry

Background:

Traditional microbial transformation systems face challenges with product inhibition and complex downstream processing.
Aqueous two-phase systems and water-organic solvent systems have limitations in biocompatibility and separation efficiency.
Nonionic surfactants in aqueous solutions can form cloud point systems, exhibiting unique phase separation properties.

Purpose of the Study:

To introduce the cloud point system as a novel medium for whole cell microbial transformation.
To discuss the application of cloud point systems for extractive microbial transformation, highlighting differences from existing systems.
To present examples of microbial transformations utilizing cloud point systems for in situ extraction.

Main Methods:

Related Experiment Videos

Characterization of cloud point system properties: phase separation and solubilization.
Evaluation of microorganism biocompatibility within the cloud point system.
Development of downstream processing using oil-water-surfactant microemulsion liquid-liquid extraction for separation and recovery.
Demonstration of whole cell microbial transformations with in situ substrate/product extraction.

Main Results:

Cloud point systems demonstrate effective phase separation and solubilization suitable for microbial applications.
The system exhibits good biocompatibility, supporting whole cell microbial activity.
Integrated downstream processing allows for efficient product separation and surfactant recovery.
Successful in situ extraction of moderately polar substrates and products was achieved.

Conclusions:

Cloud point systems represent a promising, biocompatible medium for enhanced whole cell microbial transformations.
The integrated extraction and separation capabilities offer a streamlined and efficient downstream process.
This approach provides a viable alternative to conventional biphasic systems for biotechnological applications.