Rhizobium Culture Viscosity Control via Disaccharide Medium
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Solution Overview
Problem
The viscosity of Rhizobium bacteria culture solutions increases during liquid culture, making it difficult to stir, concentrate, and separate viable bacteria, leading to inefficiencies and increased production costs.
Innovation Solution
Maintaining a culture medium with a disaccharide accounting for at least 25% of the carbon source and a pH between 5.0 and 7.0 during liquid culture of Rhizobium bacteria, specifically using maltose, trehalose, lactose, or sucrose, to inhibit viscosity increase and enhance viable cell count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nutrients essential for bacterial growth are added in abundance during production culture, then bacterial growth is improved, but viscosity of the culture solution increases
Solution Approach 1:
The patent changes the chemical composition parameter of the culture medium by replacing traditional carbon sources (glucose, sucrose) with polyols (sorbitol, mannitol, xylitol, erythritol). This parameter change allows abundant nutrient addition for bacterial growth while preventing viscosity increase, as polyols do not form viscous extracellular polymers like traditional sugars do.
2Productivity
If viscosity of culture solution increases, then bacterial growth can be enhanced, but stirring and separation of viable bacteria become difficult
Solution Approach 1:
The patent changes the physical parameter of the culture medium by using polyols instead of traditional sugars, which fundamentally alters the rheological properties. This prevents viscosity increase while maintaining nutrient abundance, thereby keeping the culture solution easily stirrable and separable throughout the cultivation process.
3Ease of manufacture
If centrifugal concentration is conducted under constant centrifugal force, then process simplicity is maintained, but sedimentation of bacteria decreases with increased viscosity
Solution Approach 1:
The patent changes the chemical composition parameter by using polyols, which prevents viscosity increase. This maintains high bacteria sedimentation efficiency during centrifugal concentration under constant centrifugal force, thereby improving harvest efficiency without complicating the process.
Data Source
AI summary
Provided herein is a culturing method for bacteria of the genus Rhizobium whereby a low viscosity can be maintained in a culture solution during the culturing of and at the end of culturing of said bacteria, and that enables easy and efficient post-procedures, including concentration and separation of viable bacteria, among others. This is achieved by growing Rhizobium bacteria by liquid culture using a medium containing a disaccharide (for example, maltose, trehalose, lactose, sucrose) accounting for at least 25 mass % of the carbon source in the medium while maintaining a pH of 5.0 to 7.0 in the culture solution throughout the course of the culture, namely from the beginning of the culturing to the end of the culturing of said bacteria.