Indole-3-Lactic Acid Purification from Fermentation Supernatant
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Solution Overview
Problem
Existing methods for extracting indole-3-lactic acid from Lactobacillus plantarum fermentation supernatant suffer from variability in content and purity due to differences in filter mechanics, necessitating improved screening and purification techniques.
Innovation Solution
A three-step method involving macroporous resin XAD-16 adsorption, dextrangel G25 separation, and reversed-phase high-performance liquid chromatography (RP-HPLC) is employed to purify indole-3-lactic acid, using specific elution solvents and flow rates to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ultrafiltration centrifugation is used to separate indole-3-lactic acid from fermentation supernatant, then the separation process is simplified, but the content and purity of indole-3-lactic acid vary due to differences in filter mechanics
Solution Approach 1:
The patent divides the separation process into multiple sequential steps: ultrafiltration centrifugation followed by macroporous resin column chromatography. This segmentation allows the first step to perform crude separation while the second step achieves high purity, resolving the contradiction between process simplicity and product purity.
Solution Approach 2:
The patent introduces macroporous resin as an intermediary medium between the fermentation supernatant and the final purified product. The resin column chromatography step acts as a mediating purification stage that enhances purity without requiring complete redesign of the initial ultrafiltration process.
2Adaptability or versatility
If different filter mechanics are used in ultrafiltration centrifugation, then the separation process can be adapted to different needs, but the content and purity of fractionated indole-3-lactic acid become inconsistent
Solution Approach 1:
The patent standardizes the filter parameters (molecular weight cutoff, centrifugal force, temperature) in the ultrafiltration centrifugation step to ensure consistent results. By controlling these parameters, the patent maintains reliability and purity consistency while still allowing flexibility in resin type selection for the chromatography step.
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
The method yields indole-3-lactic acid with a purity of 99.00% and a content of 43.14 μg/mL, demonstrating broad-spectrum antibacterial activity against various bacterial strains.
Implementation Method 1
adsorbing the fermentation supernatant with a macroporous resin XAD-16
Implementation Method 2
performing separation on the concentrate obtained in step 1) through dextrangel G25
Implementation Method 3
purifying the G25-2 fraction obtained in step 2) by reversed-phase high performance liquid chromatography (RP-HPLC)
Data Source
AI summary
The present invention discloses a method for purifying indole-3-lactic acid from a Lactobacillus plantarum fermentation supernatant, using a fermentation supernatant of Lactobacillus plantarum ZJ316 with a deposit number CCTCC NO: M 208077, including the following steps: adsorbing the fermentation supernatant with a macroporous resin XAD-16 first, then performing elution, collecting an eluate corresponding to 50% methanol with a pH of 7, and concentrating the eluate to obtain a concentrate; performing separation on the concentrate through dextrangel G25 to obtain a G25-2 fraction; and purifying the G25-2 fraction by reversed-phase high performance liquid chromatography, and concentrating the collected eluate to obtain the indole-3-lactic acid. The indole-3-lactic acid obtained in the present invention has a purity of 99.00%, and has broad-spectrum antibacterial activity.