Gallic Acid Crystallization Cooling Rate Control
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Solution Overview
Problem
Existing methods for producing gallic acid result in high residual tannin content and high production costs, and there is a contamination issue with protocatechuic acid in microbial culture solutions, which affects the purity of gallic acid crystals.
Innovation Solution
A method involving cooling an aqueous solution containing gallic acid and protocatechuic acid at a rate of 0.9° C./min or less to precipitate crystals, using a microorganism culture solution, and optimizing culture conditions such as pH, temperature, and stirring to minimize protocatechuic acid contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gallic acid is produced by hydrolyzing tannin extracted from Nulde using alkali, acid, or enzyme, then gallic acid can be obtained, but the residual tannin content is high and production cost is high
Solution Approach 1:
The patent changes the fundamental production parameter from chemical hydrolysis of tannin to microbial fermentation using engineered E. coli. This parameter change transforms the production method from a chemical process with high residual tannin and high cost to a biological process using inexpensive glucose as substrate, thereby resolving both the purity and cost issues simultaneously
Solution Approach 2:
The patent replaces the mechanical/chemical hydrolysis system with a biological fermentation system. By substituting the chemical hydrolysis mechanism with microbial metabolic pathways, the process achieves higher purity gallic acid production while using cheaper substrates, eliminating the need for expensive enzymes and complex hydrolysis equipment
2Ease of manufacture
If microbial culture solution is used to produce gallic acid, then production cost is reduced, but protocatechuic acid contamination occurs
Solution Approach 1:
The patent applies preliminary action by engineering the E. coli strain beforehand to delete or disable the protocatechuic acid production pathway. This preliminary genetic modification prevents protocatechuic acid contamination at the source, allowing the use of inexpensive microbial fermentation while maintaining high gallic acid purity without requiring additional purification steps
Solution Approach 2:
The patent extracts or removes the harmful protocatechuic acid pathway from the microbial system through genetic engineering. By taking out the problematic metabolic route that produces protocatechuic acid, the system maintains the beneficial gallic acid production while eliminating the contamination issue, preserving both low cost and high purity
3Productivity
If cooling rate is high during crystallization, then productivity is high, but protocatechuic acid contamination in crystals increases
Solution Approach 1:
The patent applies partial action by using a moderate cooling rate (0.02-0.5°C/min) rather than rapid cooling. This partial cooling approach sacrifices some crystallization speed but ensures high crystal purity by allowing selective crystallization of gallic acid while excluding protocatechuic acid, achieving the desired balance between productivity and purity
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 approach effectively reduces the protocatechuic acid content in the gallic acid crystals, improving their solubility and purity, and enhances the yield of gallic acid, making the production process more industrially viable and cost-effective.
Implementation Method 1
a step (A) of subjecting an aqueous solution (a) containing gallic acid and protocatechuic acid to crystallization under cooling at a rate of 0.9° C./min or less
Implementation Method 2
crystallization under cooling at a rate of 0.9° C./min or less
Data Source
AI summary
Provided is a method for producing a composition containing gallic acid, the composition having a low content rate of protocatechuic acid using a microbial culture solution. A method for producing a composition containing gallic acid, the method comprising a step (A) of performing cooling crystallization using an aqueous solution (a) containing gallic acid and protocatechuic acid at 0.9° C./min or less.