Neem Leaf Extract Enrichment Using Supercritical CO2 Selectivity
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Solution Overview
Problem
Existing methods for extracting Neem tree components, particularly Nimbolide, are inefficient, require high temperatures that damage molecular structures, use harmful solvents, and result in undesirable substances like Azadirachtin, making them unsuitable for medical and cosmetic applications.
Innovation Solution
A supercritical CO2 extraction method at 50° C. to 100° C. is used to selectively enrich Nimbolide content up to 25% by weight while minimizing Azadirachtin and other undesirable substances, eliminating the need for additional solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional extraction methods using solvents and high temperatures are used, then extraction efficiency is improved, but the molecular structure of temperature-sensitive components is destroyed and harmful solvents remain
Solution Approach 1:
The patent changes the physical state parameters of CO2 to supercritical conditions (temperature above 31.1°C and pressure above 73.8 atm), transforming it from a gas into a fluid with properties between gas and liquid. This enables efficient extraction while avoiding the harmful effects of traditional solvents and high temperatures, as the supercritical CO2 can be easily decompressed back to gas, leaving no residual contamination
Solution Approach 2:
The patent uses supercritical CO2 as an intermediary extraction medium that temporarily carries the active components (nimbolide, azadirachtin) from the neem leaves. After extraction, the CO2 is decompressed and separates from the extract, effectively mediating the transfer of active components without leaving harmful residues. The CO2 acts as a carrier that can be completely removed from the final product
2Speed
If high temperatures are used for extraction, then extraction speed is improved, but thermal-sensitive therapeutic components are damaged
Solution Approach 1:
The patent utilizes the unique properties of supercritical fluids where moderate temperature increases (above 31.1°C) dramatically change the solvent density and solubility parameters. This allows efficient extraction at relatively low temperatures (typically 40-50°C) compared to traditional methods, maintaining the therapeutic integrity of heat-sensitive components while achieving high extraction speeds through the enhanced diffusivity and solubility of supercritical CO2
3Quantity of substance
If conventional extraction methods are used, then extraction capacity is improved, but selective enrichment of Nimbolide is insufficient and Azadirachtin contamination occurs
Solution Approach 1:
The patent employs precise control of supercritical CO2 parameters (temperature, pressure, flow rate) to optimize selective extraction. By adjusting these parameters, the extraction process can be tuned to preferentially dissolve and extract nimbolide while minimizing azadirachtin co-extraction. The supercritical state allows for fine-tuning of solubility characteristics to achieve high selectivity
Solution Approach 2:
The patent employs multi-stage supercritical extraction processes where different parameter sets are applied in sequence. The first stage extracts bulk components including both nimbolide and azadirachtin, while subsequent stages with modified parameters selectively enrich nimbolide and remove unwanted components. This segmented approach achieves both high extraction capacity and 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
The method produces a highly concentrated Neem extract with enhanced Nimbolide content, suitable for low-cost cosmetic and pharmaceutical applications, avoiding adverse effects and maintaining therapeutic integrity.
Implementation Method 1
The extract can be obtained in a simple and cost-effective way by applying supercritical CO2 extraction conditions
Data Source
AI summary
A Neem tree leaf extract of the present invention is enriched in Nimbolide and/or depleted in Azadirachtin content compared to the relative average proportional content of these components in Neem tree leaves. A method for producing such inventive extract comprises applying supercritical CO2 extraction at conditions favoring selective enrichment of the Nimbolide content and/or selective depletion in Azadirachtin content in the extract.