Supercritical CO2 Oat Fractionation for High-Purity Beta-Glucan
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Solution Overview
Problem
Existing methods for preparing β-glucan, protein, and starch concentrates from oat often involve solvent extraction or heat treatment, which can denature valuable components and require extensive water and energy, leading to product degradation and safety concerns.
Innovation Solution
A method using non-heat-treated or slightly heat-treated oat for supercritical extraction with CO2 and/or CO2/ethanol, followed by dry-milling and mechanical separation techniques like sieving and air classification to produce high-purity β-glucan, protein, and starch concentrates without denaturing the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solvent extraction is used to prepare β-glucan concentrates, then β-glucan content increases, but proteins and other valuable components are denatured
Solution Approach 1:
The patent changes the extraction parameters by using supercritical CO2 instead of traditional organic solvents, operating at lower temperatures and pressures that preserve protein structure while effectively extracting β-glucan. This parameter change resolves the contradiction by achieving high β-glucan content without denaturing proteins.
Solution Approach 2:
The patent introduces CO2 as an intermediary substance that facilitates selective extraction of β-glucan without directly contacting and denaturing proteins. The supercritical CO2 acts as a mediator that can be easily removed, leaving the protein structure intact while achieving high β-glucan concentration.
2Productivity
If heat treatment is applied to oat, then processing efficiency improves, but functionally valuable components are denatured
Solution Approach 1:
The patent replaces thermal processing with mechanical and physical methods including supercritical fluid extraction, milling, and classification. This substitution maintains processing efficiency while avoiding the denaturing effects of heat treatment on functionally valuable components.
Solution Approach 2:
The patent changes the processing parameters from high-temperature heat treatment to lower temperature supercritical extraction followed by mechanical separation. This parameter change achieves efficient processing while preserving the integrity of heat-sensitive functional components.
3Quantity of substance
If extensive water and solvents are used for extraction, then β-glucan concentration increases, but energy consumption and product degradation increase
Solution Approach 1:
The patent utilizes the phase transition properties of CO2 between supercritical and gaseous states to achieve extraction and concentration without extensive drying. The supercritical CO2 extracts β-glucan efficiently, then transitions to gas phase for easy separation, reducing energy consumption compared to water-based extraction requiring extensive evaporation.
Solution Approach 2:
The patent uses supercritical CO2 as an intermediary extraction medium that requires minimal energy for removal compared to water or organic solvents. The CO2 can be simply depressurized to gas and vented, avoiding the high energy costs of evaporating large volumes of water or recovering organic solvents.
4Quantity of substance
If solvent-based methods are used, then β-glucan concentration increases, but product safety and quality are compromised
Solution Approach 1:
The patent uses CO2 as a disposable extraction medium that is introduced in supercritical form, performs extraction, then transitions to gas and is vented away. This eliminates the need for solvent recovery and ensures no harmful residues remain in the product, addressing safety concerns while maintaining high β-glucan concentration.
Solution Approach 2:
The patent uses CO2 to create an inert extraction atmosphere that is non-toxic and leaves no harmful residues. The inert nature of CO2 ensures product safety, eliminating the contamination risks associated with organic solvents while achieving effective β-glucan extraction and concentration.
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 maintains the natural properties of oat components, achieves high concentrations of β-glucan and starch, and reduces fat content, resulting in well-preserved, easily dispersible, and versatile products suitable for food, pharmaceutical, and cosmetic applications.
Implementation Method 1
extracting non-heat-treated or slightly heat-treated oat with a fluid in a supercritical state, typically with CO2 and/or a combination of CO2 and EtOH
Implementation Method 2
dry-milling the fat-extracted oat fraction by impact milling into oatmeal having such a particle size that at least 95% of the particles are between 1.0 and 3,000 μm
Implementation Method 3
separating a coarse fraction and a fine fraction from the oatmeal by using one or more operations selected from the group consisting of sieving and air classification
Data Source
AI summary
The invention relates to a method of preparing functionally valuable products, such as β-glucan, protein, starch and lipid concentrates from oat. The invention also relates to products thus obtained and to the use thereof. The invention further relates to the use of non-heat-treated or slightly heat-treated oat fat-extracted with supercritical extraction for preparing said products by using dry milling, sieving and air classification.