Thiocarboxylate Fermentation Medium for Sulphur Bioavailability
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Solution Overview
Problem
Conventional fermentation methods face inefficiencies due to the use of sulphur sources like sulfides and cysteine, which are costly, prone to precipitation, toxic, and lead to reduced bioavailability of sulphur, thereby affecting microbial growth and organic product production.
Innovation Solution
The use of thiocarboxylates as a sulphur source in the fermentation medium, providing sulphur in a bioavailable form that is not easily precipitated or digested by microorganisms, thus maintaining high sulphur concentrations and supporting enzymatic processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide (H2S, Na2S) is used as a sulphur source, then sulphur is provided in a reduced and bioavailable form, but precipitation of metal salts occurs and hydrogen sulfide toxicity increases
Solution Approach 1:
The patent changes the chemical form of sulphur from sulfide (S2-) to thiocarboxylate (R-CO-S-), altering the chemical parameters to eliminate precipitation issues while maintaining reduced state bioavailability. The thiocarboxylate group stabilizes the sulphur in a reduced state without forming insoluble metal salts.
Solution Approach 2:
The patent uses thiocarboxylates that can be easily replenished and do not accumulate harmful effects. Unlike sulfides that require complex handling and continuous monitoring due to toxicity and precipitation, thiocarboxylates provide a simpler, more stable sulphur source that can be added without special precautions.
2Stability of the object's composition
If cysteine is used as a sulphur source, then sulphur is provided in a stable oxidized form, but microorganisms digest it leading to high consumption rates
Solution Approach 1:
Instead of using the common oxidized sulphur source (cysteine) that gets digested, the patent inverts the approach by using a reduced sulphur compound (thiocarboxylate) that microorganisms do not digest. This reverses the conventional wisdom that oxidized forms are more stable, showing that reduced forms can be stable when properly protected in the thiocarboxylate structure.
Solution Approach 2:
The thiocarboxylate group acts as an intermediary structure that protects the sulphur atom from microbial digestion while still making it bioavailable. The R-CO-S- structure serves as a mediator between the stable oxidized form and the reactive reduced form, providing stability without sacrificing bioavailability.
3Reliability
If reduced sulphur compounds are used to lower ORP, then bioavailability increases, but actual sulphur concentration available to microbes decreases
Solution Approach 1:
The patent uses composite thiocarboxylate structures (R-CO-S-) that combine the benefits of reduced sulphur compounds (bioavailability) with the stability of protected sulphur forms (concentration maintenance). The organic R-CO- group acts as a protective composite structure that prevents unwanted reactions while maintaining sulphur in a bioavailable reduced state.
Data Source
AI summary
The present invention relates to an aqueous fermentation medium comprising sulphur in the form of at least one thiocarboxylate, wherein the thiocarboxylate has a chemical structure of Formula I and R═H, alkyl, COOH, COSH, and wherein the alkyl groups may also contain OH, COSH and/or COOH and wherein the concentration of the thiocarboxylate is 2 to 20 mg/L in the fermentation medium.