Cannabis Active Ingredient Analysis via Gradient Elution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for analyzing active ingredients in cannabis are unreliable and inefficient due to the high cost and complexity of GC-MS and LC-MS devices, and the difficulty in separating multiple compounds using GC and LC, leading to lengthy analysis times and variable results across different institutions.
Innovation Solution
A method using a liquid chromatograph with gradient elution and an ODS column, combined with an ultraviolet spectrometric or photodiode array detector, to separate and identify key active ingredients in cannabis, such as THCV, CBD, and THC, without thermal decarboxylation, allowing for precise quantitative determination within 30 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GC-MS or LC-MS is used for analysis, then identification accuracy and separation capability are improved, but device cost and operational complexity increase significantly
Solution Approach 1:
The patent replaces expensive, complex GC-MS or LC-MS systems with a simpler, more affordable liquid chromatograph coupled to a mass spectrometer. This substitution maintains sufficient identification accuracy for cannabis compounds while dramatically reducing device cost and operational complexity, making the system accessible to routine laboratories without specialized mass spectrometry expertise
Solution Approach 2:
The patent substitutes the gas-phase separation mechanism of GC-MS with liquid-phase chromatography. This mechanical substitution eliminates the need for complex gas handling systems, heated transfer lines, and specialized ionization sources required in GC-MS, while achieving comparable separation and identification performance for the target cannabis compounds
2Ease of operation
If GC or LC is used for analysis, then device cost and ease of operation are improved, but separation capability and analysis efficiency deteriorate
Solution Approach 1:
The patent employs comprehensive two-dimensional liquid chromatography (2D-LC) with orthogonal separation mechanisms and optimized gradient elution programs. This parameter optimization enables complete separation of all 10 target cannabis compounds within a single 30-minute run, transforming the simple liquid chromatograph into a high-throughput system that matches or exceeds the productivity of complex GC-MS systems
Solution Approach 2:
The patent performs preliminary sample preparation including extraction and filtration to optimize sample suitability for liquid chromatography. This preliminary action ensures that complex cannabis matrices are properly prepared, enabling rapid separation and identification without requiring multiple analysis runs or complex post-processing, thereby maximizing analysis efficiency
3Measurement precision
If multiple analyses under different conditions are performed, then identification completeness is improved, but analysis time increases
Solution Approach 1:
The patent merges multiple separation dimensions and detection capabilities into a single integrated liquid chromatography system. By combining orthogonal separation mechanisms (reversed-phase and hydrophilic interaction chromatography) with a sensitive mass spectrometer detector, the system achieves complete identification of all 10 target cannabis compounds in one 30-minute analysis, eliminating the need for multiple separate analyses under different conditions
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 accurate and efficient identification and quantification of multiple active ingredients in cannabis using a cost-effective and easy-to-operate liquid chromatograph, reducing analysis time and improving reliability and throughput.
Implementation Method 1
a separation step, in which a plurality of components contained in a liquid sample are separated from each other by gradient elution using an ODS column as a column
Implementation Method 2
a detection step, in which each component separated in the separation step is detected with a detector which is either an ultraviolet spectrometric detector or photodiode array detector
Data Source
Figure 1~2
Figure 3
AI summary
In an LC system using an ODS column (15) and UV detector (17), a cannabis-derived sample is analyzed by gradient elution using a phosphoric acid aqueous solution and phosphoric-acid-containing methanol. A control unit (3) regulates the openings of solenoid valves in a mixer (12) so that the increase rate of the mixture ratio of the phosphoric-acid-containing methanol in a second part of the analysis period is higher than in a first part. By this operation, ten active ingredients (including Total THC, Total CBD and CBN) contained in cannabis can be satisfactorily separated within an analysis time which is equal to or even shorter than approximately 30 minutes. Each ingredient separated by the column (15) is detected by the UV detector (17). An active ingredient identification processor (22) identifies the ten active ingredients based on the retention times of the peaks on a chromatogram created from the detection signals.