Cynaropicrin Extraction Using Ultrasonic Cavitation
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Solution Overview
Problem
Current methods for extracting cynaropicrin from Cynara cardunculus leaves result in lower concentrations and longer extraction times, often requiring additional purification steps and environmentally aggressive solvents, whereas there is a need for higher yields and reduced environmental impact.
Innovation Solution
The use of solid-liquid batch extraction, ultrasonic, microwave, and pressurized liquid extraction methods with solvents like ethanol, ethyl acetate, and ethanol/water mixtures, which reduce extraction time and increase cynaropicrin concentration without the need for additional purification steps, using environmentally friendly solvents and lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solid-liquid batch extraction is used, then extraction simplicity is maintained, but extraction time is long (7 hours) and cynaropicrin concentration is low (55 mg/g dry weight)
Solution Approach 1:
The patent replaces conventional mechanical batch extraction with ultrasonic extraction technology. The ultrasonic waves create cavitation bubbles that collapse and generate localized high energy, dramatically enhancing the extraction efficiency of cynaropicrin from Cynara cardunculus leaves. This substitution reduces extraction time from 7 hours to significantly shorter durations while increasing cynaropicrin concentration yield.
Solution Approach 2:
The patent optimizes extraction parameters including using ethanol/water mixtures at specific ratios (e.g., 70:30, 80:20), controlling extraction temperature (40-60°C), and adjusting solid-liquid ratios. These parameter changes enable higher cynaropicrin extraction efficiency compared to conventional methods, achieving concentrations up to 40 mg/g dry weight with reduced extraction time.
2Object-affected harmful factors
If conventional extraction methods are used, then extraction process is simple, but environmentally aggressive solvents are required
Solution Approach 1:
The patent changes the solvent system from aggressive conventional solvents to environmentally friendly ethanol/water mixtures. By optimizing the ethanol concentration (e.g., 70%, 80% v/v) and extraction parameters, the method achieves high cynaropicrin extraction efficiency (up to 40 mg/g dry weight) while eliminating the need for toxic solvents, thus reducing environmental impact and harmful factors.
3Manufacturing precision
If additional purification steps are added, then cynaropicrin purity is improved, but process complexity and cost increase
Solution Approach 1:
The patent replaces complex multi-step purification processes with a single ultrasonic extraction step using optimized ethanol/water mixtures. The ultrasonic cavitation effect selectively extracts cynaropicrin with high efficiency, producing extracts with sufficient purity (up to 40 mg/g dry weight) that eliminate the need for additional chromatography or fractionation steps, thereby simplifying the overall process while maintaining manufacturing precision.
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
These methods achieve higher cynaropicrin concentrations (up to 27-40 mg/g dry weight) with reduced extraction times and lower energy costs, while avoiding the use of aggressive solvents, thus enhancing the efficiency and sustainability of the extraction process.
Implementation Method 1
extraction of the lyophilised biomass with the solvent selected in the previous step in a closed container protected from light, subjected to the action of bath ultrasound equipment or with a probe
Implementation Method 2
The container is subjected to the action of bath ultrasound equipment or with a probe during the extraction step
Implementation Method 3
The container is subjected to the action of microwave equipment during the extraction step
Implementation Method 4
extraction by pressurized liquid
Data Source
AI summary
The present invention relates to methods for the extraction of the sesquiterpene lactone cynaropicrin, present in leaves of Cynara cardunculus. The invention contemplates the extraction of cynaropicrin, present in thistle leaves (Cynara cardunculus), where, before the extractive process, the biomass undergoes a size reduction in order to obtain a grain size of less than 400 µm. After this first step, the biological material in the present invention undergoes several types of independent extraction: solid-liquid batch, ultrasounds, microwaves or pressurized liquid solvent extraction. In the present invention, pure solvents, such as ethanol, ethyl acetate, as well as solvent mixtures, such as ethanol/water, are also presented as extraction solvents. The extraction process is controlled in relation to time, temperature, solid-liquid ratio and solvent variables for the set of processes shown, and depending on the extraction process, controlled in relation to stirring, ultrasonic power, microwave power and number of cycles of extraction. These processes of cynaropicrin extraction have potential for application in the nutraceutical, pharmaceutical and chemical industries.