Free Xanthophyll Purification via Salting Out
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Solution Overview
Problem
Current methods for purifying xanthophylls from plant extracts face challenges such as the use of halogenated solvents, high temperatures leading to degradation, and the need for costly and cumbersome solvent removal processes, which are not environmentally friendly or economically viable for commercial production.
Innovation Solution
A method involving saponification of plant-derived oleoresins, followed by washing with salt solutions to remove water-soluble impurities, using non-polar and increased polarity solvents to isolate free xanthophylls, and final drying with an alcohol-water mixture to minimize solvent use and epoxide formation, resulting in a commercially adaptable and environmentally friendly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If halogenated solvents are used for xanthophyll purification, then high purity xanthophylls can be obtained, but the process becomes environmentally harmful and unsuitable for food applications
Solution Approach 1:
The patent replaces expensive and harmful halogenated solvents with cheaper, safer alternative solvents that can be easily disposed of or degraded. The process uses solvents like ethyl acetate, hexane, or petroleum ether that are less harmful to the environment and human health, while still achieving effective extraction and purification of xanthophylls without requiring complex recovery processes.
Solution Approach 2:
The patent changes the chemical parameters of the purification process by adjusting pH levels, temperature, and solvent polarity to achieve effective separation of xanthophylls from impurities. By controlling these parameters, the process achieves high purity without relying on harmful halogenated solvents, using instead aqueous or mild organic solvent systems that are safer for the environment and food applications.
2Productivity
If high temperatures are used for xanthophyll extraction, then extraction efficiency improves, but xanthophyll degradation increases
Solution Approach 1:
The patent optimizes extraction parameters by using mild temperatures combined with optimized solvent systems and pH conditions to achieve efficient xanthophyll extraction without thermal degradation. The process employs controlled pH levels and specific solvent combinations that enhance extraction efficiency at lower temperatures, preserving the stability and activity of xanthophyll compounds.
Solution Approach 2:
The patent introduces intermediary substances such as chelating agents or pH buffers that facilitate xanthophyll extraction at mild temperatures. These intermediaries help stabilize the xanthophyll compounds during the extraction process, preventing degradation while maintaining high extraction efficiency through chemical assistance rather than thermal energy alone.
3Manufacturing precision
If extensive solvent removal processes are used, then high purity xanthophylls are obtained, but operational costs and process complexity increase
Solution Approach 1:
The patent employs solvent systems that can be easily discarded or degraded rather than requiring complex recovery and removal processes. By using volatile or biodegradable solvents with appropriate boiling points or degradation characteristics, the process simplifies the final purification steps and reduces operational complexity while maintaining high product purity through effective initial extraction and washing steps.
Solution Approach 2:
The patent extracts and removes impurities through selective washing and filtration steps rather than requiring extensive solvent removal. By using pH-controlled washing steps and filtration, the process selectively removes unwanted substances while preserving xanthophylls, reducing the need for complex thermal or vacuum drying processes and simplifying overall operation.
4Manufacturing precision
If propylene glycol is used for xanthophyll extraction, then some purification is achieved, but lutein isomerization and decomposition occur
Solution Approach 1:
The patent changes the chemical environment by using alternative solvents with different polarities and chemical properties that do not promote lutein isomerization. By adjusting pH levels and selecting solvents with appropriate chemical stability, the process achieves effective purification while maintaining the structural integrity and isomeric composition of lutein and other xanthophylls throughout the extraction process.
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 effectively isolates free xanthophylls with high purity and minimal epoxide levels, reducing solvent consumption and operational costs while ensuring environmental safety, making it suitable for commercial production.
Implementation Method 1
The saponified resin is washed with a salt solution, preferably more than once and preferably until the pH of the resin is about 6.5 to 9
Implementation Method 2
The resin is then washed with a non-polar solvent to remove lipid components
Implementation Method 3
The resin is washed at least once with an increased polarity solvent
Implementation Method 4
The resin is filtered and/or dried to obtain free xanthophylls
Data Source
AI summary
A simple and economic method of extracting free xanthophylls from plant material, particularly marigold petals and boxthorn berries, is described. The method relies upon salting out of aqueous components from a saponified oleoresin, which limits the use of organic solvents during the extraction and is also very economical.