Lutein Extraction via Supercritical CO2 and Saponification
Solution Overview
Problem
Existing methods for extracting lutein from natural materials using supercritical carbon dioxide require high temperatures and pressures, leading to degradation or decomposition of xanthophylls and inefficient yield, especially for achieving high purity lutein suitable for nutraceuticals or drugs.
Innovation Solution
Modifying natural lutein esters to free lutein before extraction with supercritical fluids at optimized low temperatures (40-100 °C) and pressures (200-450 bar), followed by chromatography purification to achieve high yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and high pressure are used for supercritical fluid extraction, then extraction yield is improved, but xanthophylls degradation occurs
Solution Approach 1:
The invention applies preliminary action by converting lutein esters to free lutein through saponification before the supercritical fluid extraction process. This pre-treatment modifies the molecular structure to have lower molecular weight and better solubility in supercritical CO2, enabling effective extraction at lower temperatures (31-70°C) that prevent degradation while maintaining high yield
2Productivity
If high pressure is used for supercritical fluid extraction, then extraction efficiency is improved, but energy consumption and safety risks increase
Solution Approach 1:
The invention applies parameter changes by modifying the molecular weight and solubility characteristics of lutein through saponification. This chemical modification allows the extraction process to operate at lower pressure parameters (200-450 bar) while maintaining high extraction efficiency, thereby reducing energy consumption and safety risks associated with high-pressure operations
3Productivity
If organic solvent extraction is used, then extraction yield is improved, but solvent residue and health safety issues occur
Solution Approach 1:
The invention replaces the mechanical/chemical extraction system using organic solvents with a supercritical fluid extraction system. Supercritical CO2 serves as a green solvent that can be completely removed by pressure reduction without leaving harmful residues, eliminating the health safety issues associated with organic solvent residues while maintaining effective extraction yield
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 enables the extraction of high-yield and highly purified lutein from natural materials like marigold, kale, and algae at reduced temperatures and pressures, avoiding solvent-related issues and achieving up to 98.5% crude lutein yield and 99.5% purity.
Implementation Method 1
extraction comprising contacting said pretreated natural materials with supercritical fluid, adjusting temperature to between 40-100 °C or pressure to between 200-450 bar for a period of time to provide the free lutein in the supercritical fluid
Implementation Method 2
supercritical carbon dioxide possesses high diffusivity and low viscosity when compared to liquid solvents. Supercritical carbon dioxide is, therefore, suitable for extraction due to its mass transfer property
Implementation Method 3
The crude extract obtained after solvent evaporation is called oleoresin. The oleoresin contains 10% (w/w) xanthophylls which lutein is the major product
Data Source
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AI summary
The present invention provides the new method for extracting lutein from natural materials wherein the said method comprises of modification of natural lutein ester in the natural materials to free lutein and/or low molecular weight lutein ester, extraction of the said natural materials with supercritical fluid at the optimal conditions. The said method yields high amount of crude lutein with high purity due to the mild condition used for extraction. Therefore, no degradation of the desired product is occurred. The crude lutein can be further purified with chromatography in order to obtain the highly purified lutein. The method according to this invention can be applied to the extraction of xanthophylls or others beside lutein.