RG-I-Enriched Pectic Polysaccharide Isolation by Enzymatic Hydrolysis
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Solution Overview
Problem
Existing methods for isolating pectic polysaccharides, particularly rhamnogalacturonan-I (RG-I), often require the use of organic solvents and do not effectively enhance the biological functionality of the polysaccharides.
Innovation Solution
A method involving enzymatic hydrolysis of a pectin-rich substrate from plant material without organic solvents, followed by ultrafiltration using membranes with a 5 to 100 kDa cut-off, to produce a polysaccharide isolate enriched in RG-I, utilizing pectinases like pectin lyase and endo-polygalacturonase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic solvents are used in the extraction process, then the isolation of pectic polysaccharides is facilitated, but the biological functionality and safety of the final product is compromised
Solution Approach 1:
The invention changes the extraction parameters from organic solvent-based to aqueous-based methods, using controlled pH, temperature, and enzymatic conditions to achieve effective extraction without compromising biological functionality. This allows the isolation of RG-I polysaccharides while maintaining their immunomodulatory properties.
Solution Approach 2:
The invention replaces chemical extraction methods (organic solvents) with enzymatic hydrolysis and physical separation methods (ultrafiltration). This substitution eliminates harmful chemical residues while effectively isolating the target polysaccharides based on their molecular weight characteristics.
2Productivity
If complete hydrolysis is performed to break down pectic polysaccharides, then smaller oligosaccharides are produced, but the biological functionality requiring larger molecular structures is lost
Solution Approach 1:
The invention applies partial hydrolysis rather than complete hydrolysis, using controlled enzymatic treatment to achieve the desired degree of breakdown. This partial action produces a mixture of oligosaccharides and polysaccharides with molecular weights optimized for both solubility and biological functionality, particularly immunomodulatory activity.
Solution Approach 2:
The invention uses feedback control in the hydrolysis process, monitoring the degradation products and adjusting enzyme concentration, pH, and time to achieve the optimal molecular weight distribution. This ensures the production of oligosaccharides and polysaccharides that retain the necessary structural features for biological activity.
3Manufacturing precision
If ultrafiltration with low molecular weight cut-off is used, then smaller oligosaccharides are separated, but the larger functional polysaccharide structures are retained in the retentate
Solution Approach 1:
The invention uses ultrafiltration membranes with specific molecular weight cut-offs to segment the hydrolysis products into different molecular weight fractions. This segmentation allows the separation of small oligosaccharides (passing through the membrane) from larger functional polysaccharides (retained in the retentate), enabling selective recovery of the biologically active fractions.
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 a highly functional RG-I polysaccharide isolate that enhances interaction with intestinal cells, improving immune response and resistance to infections by removing homogalacturonan domains and inactive components.
Implementation Method 1
subjecting a pectin-rich substrate that has been obtained from plant material without the use of organic solvent and that contains a significant amount of RG-I polysaccharide to enzymatic hydrolysis to partially hydrolyse the RG-I polysaccharide
Implementation Method 2
utilizing pectinases like pectin lyase and endo-polygalacturonase
Implementation Method 3
subjecting the partially hydrolysed RG-I polysaccharide to ultrafiltration using an ultrafiltration membrane having a cut-off in the range of 5 to 100 kDa
Data Source
AI summary
The invention provides a method of producing a hydrolysed pectic polysaccharide isolate that is enriched in rhamnogalacturonan-I, said method comprising the steps of:providing a pectin-rich substrate that has been obtained from plant material without the use of organic solvent, said pectin-rich substrate containing at least 3% by weight of dry matter of pectic polysaccharides;subjecting the pectin-rich substrate to enzymatic treatment to partially hydrolyse the pectic polysaccharides, said treatment enzymatic treatment comprising the use of one or more pectinases selected from pectin lyase (EC4.2.2.10), pectate lyase (EC 4.2.2.2), rhamnogalacturonan galacturonohydrolase (EC 3.2.1.173), endo-polygalacturonase (EC 3.2.1.15), exopolygalacturonase (EC 3.2.1.67 and EC 3.2.1.82);subjecting the partially hydrolysed pectic polysaccharides to ultrafiltration using an ultrafiltration membrane having a molecular weight cut-off in the range of 5 to 100 kDa; andrecovering the ultrafiltration retentate.The present invention further relates to the hydrolysed pectic polysaccharide isolate obtained by the present method and to a process of preparing a product selected from a nutritional formulation, a food product, a dietary supplement, a beverage or a pharmaceutical product, said process comprising addition of the aforementioned hydrolysed pectic polysaccharide isolate.