Weissella cibaria Dextran Production via Optimized Culture Medium
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Solution Overview
Problem
Current methods for producing high molecular weight dextran yield variability and require optimization to achieve consistent high yields, particularly in industrial applications such as food and pharmaceutical industries.
Innovation Solution
A tailored method for producing dextran using a specific strain of Weissella cibaria (NCIMB 42196) involving an optimized synthetic culture medium with balanced carbon and nitrogen sources, controlled pH, and specific incubation conditions to maximize dextran production, including the use of yeast extract and sucrose as primary nutrients, and scotta-broth as a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dextran production methods are used, then production can proceed with standard processes, but yield variability is high and consistent high yields cannot be achieved
Solution Approach 1:
The patent applies parameter changes by optimizing multiple cultivation parameters including carbon source concentration (sucrose 10-20%), nitrogen source type (yeast extract 1-3%), pH (5.5-6.5), temperature (30-37°C), and incubation time (18-48 hours) to achieve consistent high dextran yields with the Weissella cibaria strain
Solution Approach 2:
The patent implements feedback control by monitoring dextran production levels and adjusting cultivation parameters accordingly, using optimized medium composition and incubation conditions that were determined through systematic experimentation to maintain consistent high yields
2Manufacturing precision
If high molecular weight dextran is produced, then product quality for industrial applications is improved, but production optimization becomes more complex
Solution Approach 1:
The patent controls molecular weight parameters by adjusting specific cultivation conditions including temperature (30-37°C), pH (5.5-6.5), and carbon source concentration, which influence the dextransucrase enzyme activity and polymer chain lengthening without requiring complex equipment modifications
Solution Approach 2:
The Weissella cibaria strain naturally produces dextransucrase enzyme that catalyzes dextran synthesis with desired molecular weight characteristics under the optimized cultivation conditions, eliminating the need for external enzyme addition or complex processing equipment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves high yields of high molecular weight dextran with consistent quality, suitable for industrial applications, particularly in food and pharmaceutical industries, enhancing product characteristics like viscosity and biocompatibility.
Implementation Method 1
Leuconostoc produces the enzyme dextransucrase and secret it into the culture medium in the presence of sucrose. This enzyme, dextransucrase, synthesizes dextran from the sucrose substrate, catalyzing the transfer of glucosyl residues from sucrose to dextran polymer
Implementation Method 2
W. cibaria is a species of Gram-positive, heterofermentative bacteria
Data Source
AI summary
Method for the production of dextran comprising the following steps: prepare a culture medium containing the appropriated mixture and balance of ingredients, mainly after accurate selection of nature and concentration of carbon and nitrogen sources, with a specific initial pH, inoculate the culture medium with an appropriated quantity of bacteria strain (to standardize the production and avoid as much as possible the variability of the system); carry out the fermentation for a given time and at a given temperature; precipitate the dextran to separate the product from the culture medium; the bacteria strain is a strain of Weissella cibaria.