Organic Gluconate Fermentation Using Non-Edible Grain Hydrolysates
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Solution Overview
Problem
Existing chemical and electrochemical methods for gluconic acid production are environmentally toxic and costly, and continuous fermentative production by Aspergillus niger is hindered by fungal mat accumulation, necessitating frequent system cleaning.
Innovation Solution
A biotechnological process using enzymatic hydrolysis of non-edible organic maize or wheat to produce monosaccharides, followed by microbial fermentation with a consortium of Aspergillus sp. and Penicillium spp. strains, optimized for gluconic acid yield, and subsequent fortification with minerals to produce natural organic gluconate salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical oxidation or electrolytic oxidation methods are used for gluconic acid production, then production efficiency is improved, but environmental toxicity and cost increase
Solution Approach 1:
The patent replaces chemical oxidation methods (which use strong oxidizing agents like nitric acid) and electrolytic oxidation methods with biological oxidation using microorganisms (Aspergillus niger, Gluconobacter oxydans). This substitution eliminates harmful chemical substances while maintaining production efficiency, as the microbial systems can oxidize glucose to gluconic acid under mild conditions without producing toxic byproducts.
Solution Approach 2:
The patent changes the oxidation mechanism from chemical/electrochemical to biological. By using microbial enzymes (glucose oxidase, gluconate dehydrogenase), the system achieves oxidation at ambient temperatures and pressures, avoiding the harsh conditions of chemical oxidation while maintaining high productivity. The microbial cells provide a controlled, selective oxidation pathway that is both efficient and environmentally benign.
2Productivity
If continuous fermentative production by Aspergillus niger is used, then gluconic acid yield is improved, but fungal mat accumulation occurs requiring frequent system cleaning
Solution Approach 1:
The patent extracts and removes the harmful fungal mat accumulation from the continuous production system. By implementing periodic filtration and centrifugation steps, the system separates the microbial biomass from the gluconic acid product, allowing continuous operation without complete system shutdown for cleaning. This extraction of solid biomass enables prolonged continuous fermentation while maintaining high yield.
Solution Approach 2:
The patent discards the fungal mat accumulation through filtration and centrifugation, separating it from the liquid gluconic acid product. The microbial cells are removed from the production stream, preventing their continued accumulation in the reactor. This discarding of biomass allows the system to maintain continuous operation without the harmful effects of fungal mat buildup, while the gluconic acid is recovered in high purity form.
3Reliability
If frequent system cleaning is performed to remove fungal mat, then system reliability is maintained, but production time is lost
Solution Approach 1:
The patent applies preliminary filtration and centrifugation actions during the fermentation process itself, rather than waiting for fungal mat to accumulate to problematic levels. By periodically removing microbial biomass at controlled intervals, the system prevents mat accumulation before it affects production. This preliminary action maintains system reliability while minimizing time loss, as the filtration steps are integrated into the continuous process rather than requiring separate shutdown periods.
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 a robust, cost-effective, and time-efficient production of gluconic acid and its salts with enhanced yield, suitable for various industrial applications, including pharmaceuticals, food, textiles, and construction, while being environmentally friendly.
Implementation Method 1
conversion of non-edible grade organic maize or wheat into monosaccharides by enzymatic hydrolysis
Implementation Method 2
enzymatic hydrolysis of non-edible organic maize or wheat with α-amylase and glucosidase
Implementation Method 3
conversion to organic gluconic acid by microbial fermentation
Implementation Method 4
microbial fermentation with a consortium of Aspergillus sp. and Penicillium spp. strains
Data Source
AI summary
The present invention discloses the conversion of non-edible grade organic maize or wheat into monosaccharides by enzyme hydrolysis. The generated glucose at 14-16% is used to produce natural, organic gluconic acid by microbial fermentation of three strains Aspergillus niger NCIM 545, Penicillium notatum NCIM 745 and Penicillium chrysogenum NCIM 709. These strains are improved by unique media constituents and parameters for product yield enhancement along with the reduced time of gluconic acid production by 15-20 h. Further, gluconic acid is fortified with calcium or sodium or magnesium or ferrous to produce respective gluconate salts which were processed by a set of downstream processes including spray drying to obtain in powder form. These organic gluconates have immense applications in food, pharma, feed, and construction sectors for supplying organic source as well as minerals. This route of gluconic acid and its salts production is robust simple, cost-effective and less time taking by using eco-friendly biotechnological processes.