Rapeseed Oil Polyphenol Analysis Using Acetonitrile-Water Extraction
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Solution Overview
Problem
Current methods for analyzing polyphenol content in rapeseed oil, such as liquid-liquid extraction and solid-phase extraction, are cumbersome, solvent-intensive, and suffer from high matrix co-extract content, necessitating a simpler and more environmentally friendly approach.
Innovation Solution
A method involving the use of a mixed acetonitrile-water extractant with solid-liquid separation, followed by C18 adsorbent purification and freezing treatment to obtain a polyphenol solution, which is then analyzed using liquid chromatography, reducing matrix interference and improving extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid-liquid extraction or solid-phase extraction is used to extract polyphenols from rapeseed oil, then polyphenols can be extracted, but the operation becomes cumbersome and organic solvent consumption increases
Solution Approach 1:
The patent changes the extraction parameter from traditional organic solvents to acetonitrile-water mixed solution, which simplifies the extraction process while maintaining high polyphenol extraction efficiency. This parameter change resolves the contradiction by providing a simpler operational procedure without sacrificing extraction performance
Solution Approach 2:
The patent uses a composite extraction system combining acetonitrile and water in specific ratios, along with C18 adsorbent material, to create an integrated extraction-purification approach. This composite approach simplifies operations by combining multiple functions into a streamlined process while achieving high extraction efficiency
2Quantity of substance
If liquid-liquid extraction or solid-phase extraction is used to extract polyphenols from rapeseed oil, then polyphenols can be extracted, but organic solvent consumption increases and environmental pollution occurs
Solution Approach 1:
The patent replaces traditional organic solvents with acetonitrile-water mixed solution, changing the chemical parameter of the extraction system. This substitution reduces environmental pollution while maintaining effective polyphenol extraction, resolving the contradiction between extraction efficiency and environmental harm
Solution Approach 2:
The patent employs disposable C18 adsorbent cartridges that can be discarded after single use, eliminating the need for complex solvent recovery and disposal processes. This approach reduces organic solvent pollution while maintaining high extraction efficiency, resolving the environmental contradiction
3Quantity of substance
If traditional extraction methods are used, then polyphenols can be extracted, but matrix co-extract content becomes high
Solution Approach 1:
The patent introduces C18 adsorbent as an intermediary material between the extractant and the final extract. This intermediary selectively adsorbs polyphenols while allowing matrix components to pass through, thereby reducing matrix co-extract content while maintaining high polyphenol recovery
Solution Approach 2:
The patent uses porous C18 adsorbent material with specific pore structures that enable selective retention of polyphenols. The porous structure provides high surface area for adsorption while excluding larger matrix molecules, resolving the contradiction between extraction efficiency and matrix contamination
4Manufacturing precision
If acetonitrile-water extractant with C18 adsorbent is used, then matrix co-extract content is reduced and purification efficiency is improved, but the extraction process becomes more complex
Solution Approach 1:
The patent merges the extraction and purification steps into a single integrated process using C18 adsorbent cartridges. The extraction occurs during loading, and purification occurs simultaneously through selective adsorption, eliminating the need for separate purification steps and reducing overall process complexity while maintaining high purification efficiency
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 achieves an average polyphenol recovery rate of 81.31% to 102.95% with low relative standard deviation (0.86% to 8.03%), offering higher accuracy and precision while minimizing organic solvent use and environmental impact.
Implementation Method 1
extracting the rapeseed oil by using a mixed solution of acetonitrile and water as an extractant
Implementation Method 2
adding 25 to 35 mg/mL C18 adsorbent to the extracting solution obtained in step (1), and performing separation to remove solid components
Implementation Method 3
the step (1) further includes performing freezing treatment on the collected supernatant to obtain the extracting solution. The conditions of the freezing treatment are as follows: the temperature is −15° C. to −20° C., and the time is 1.5 to 2.5 h
Implementation Method 4
the separation is performing centrifugal separation on extract liquor at a rotational speed of 3,000 to 5,000 rpm
Data Source
AI summary
The disclosure discloses a method for quickly and accurately analyzing polyphenol content in rapeseed oil, and belongs to the field of analysis of natural compounds. The separation method of the disclosure uses acetonitrile-water as an extractant to extract polyphenols from the rapeseed oil, and cooperates with a C18 adsorbent for purification, and then performs separation and purification. Compared with the traditional liquid-liquid extraction and solid-phase extraction, the method has an average recovery rate of polyphenols in the rapeseed oil of 81.31% to 102.95%, and RSDs of 0.86% to 8.03%, and has higher accuracy and precision. The method of the disclosure not only uses less organic reagents and causes less environmental pollution, but also reduces matrix interference and improves purification efficiency through optimization of the adsorbent. The method of the disclosure not only is simple to operate and low in cost, but also has less matrix interference and accurate results, and is suitable for the qualitative and quantitative determination of polyphenols in the rapeseed oil.