Ultrasonic-Assisted Extraction of Cannabidiolic Acid from Cannabis Biomass
May 27th, 2022
Ultrasonic-assisted extraction (UAE) increases extraction efficiency of solvents and when applied to Cannabis spp. biomass it reduces the time required for extraction. This decreases the cost and potential cannabinoid loss due to degradation. Additionally, UAE is considered a green method due to low solvent use.
This protocol demonstrates the whole process of CBD extraction, starting from preparing the material, solvent extraction and measuring CBD content. By suggesting the optimized solvent and solvent concentration, this method eliminates unnecessary processes and can help in efficient solvent extraction for industrial purposes. Begin by obtaining Cherry Wine inflorescences from plants grown in the field.
Air dry the inflorescences at 35 degrees Celsius for 48 hours. Grind the inflorescences using a grinding machine set at 177 micrometers. Pass the pulverized material through number 80 mesh sieve and store the powder in a sealed bag at room temperature.
In a 50-milliliter conical tube, weigh 0.5 grams of the cannabis inflorescences powder. Add 40 milliliters of 50%ethanol prepared in deionized water. Place the extraction vessel in an ultrasonic bath set at 40 kilohertz set room temperature.
Perform the extraction for 30 minutes, increasing the temperature of the bath from 25 to 30 degrees Celsius. After sonication, decant the extraction fluid into a centrifuge tube. Centrifuge the fluid at 3000-times G at 15 degrees Celsius for 15 minutes.
Filter the supernatant through an 8-micrometer filter paper under vacuum. Dilute the cannabinoid standards to operating concentrations of 100, 50, 25, and 12.5 micrograms per milliliter in 100%methanol. Mix and sonicate for five minutes in an ultrasonic bath set at 40 kilohertz and sonication power of 100 watts.
Filter the standards and the cannabis sample supernatant through a 0.45-micrometer polytetrafluoroethylene syringe filter. Put the samples in 1.5 milliliter vials, and place them into the HPLC autosampler. Load 10 microliters of the sample and run the HPLC using the parameters shown in this table.
Generate a standard curve and derive cannabinoid concentrations in 50 to 200 micrograms per milliliter. Calculate the weight of cannabinoids in micrograms by multiplying with the volume of the solvent used in the extraction process, convert the value to milligrams by dividing it by 1, 000. Divide this value by the weight of the plant material used in the extraction to obtain milligrams per gram of dry weight.
HPLC analysis showed that when using 100%solvents, acetonitrile was most favorable for the extraction of individual cannabinoids. However, ethanol was further examined due to the lowest toxicity of all. Evaluation of the impact of aqueous ethanol on concentration of extracted cannabinoids showed that maximum extraction was observed at 50%ethanol.
There was a 39.7%increase over absolute ethanol for the extraction of CBDA. The level of THCA was also reduced by 20.3%Using the design-of-experiment approach, extraction of CBDA plus CBD was optimized. Response surface methodology analysis confirmed the ideal parameters as 30-minute extraction, 53.4%ethanol in water, and 1 to 100 sample-to-solvent ratio.
A higher amount of CBDA was obtained using the ultrasonic-assisted extraction method compared to the maceration method. The amount of extracted CBD also doubled using the ultrasonic method, indicating higher efficiency for cannabinoid extraction. It is important to remember the sample to solvent ratio, extraction time and solvent concentration.
optimized by this study. This procedure can be performed for extraction of other cannabinoids from hemp.
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Overview
This protocol demonstrates the efficient extraction of CBD from Cannabis spp. using ultrasonic-assisted extraction (UAE). By optimizing the extraction process, the method reduces time and costs while minimizing cannabinoid loss.
Key Study Components
Area of Science
- Neuroscience
- Biology
- Cannabis extraction techniques
Background
- Ultrasonic-assisted extraction (UAE) enhances extraction efficiency.
- UAE reduces extraction time and costs.
- Considered a green method due to low solvent use.
- Optimized solvent and concentration improve industrial applications.
Purpose of Study
- To demonstrate a streamlined CBD extraction process.
- To optimize solvent use for efficiency.
- To minimize cannabinoid degradation during extraction.
Methods Used
- Preparation of Cherry Wine inflorescences.
- Air drying at 35 degrees Celsius for 48 hours.
- Grinding inflorescences to 177 micrometers.
- Using a number 80 mesh sieve for powder preparation.
Main Results
- Efficient extraction process demonstrated.
- Reduction in extraction time and costs achieved.
- Minimized cannabinoid loss through optimized methods.
- UAE shown to be a viable green extraction method.
Conclusions
- UAE significantly improves CBD extraction efficiency.
- Optimized methods can be applied for industrial purposes.
- Study supports the use of green methods in cannabinoid extraction.
Frequently Asked Questions
Executive Industry Relevance
Ultrasonic-assisted extraction (UAE) of cannabidiolic acid (CBDA) from Cannabis biomass addresses the need for efficient, scalable, and reproducible extraction of acidic cannabinoids for pharmaceutical R&D. By optimizing solvent polarity and concentration, this method enhances extraction yield and supports robust analytical quantification, directly impacting early-stage compound sourcing and downstream assay development. The approach enables rapid, standardized workflows critical for portfolio advancement and risk-adjusted decision-making in cannabinoid research.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables reliable sourcing of CBDA for mechanistic and pharmacological studies.
- Supports functional target validation by providing high-purity acidic cannabinoids.
- Facilitates predictive confidence in compound characterization and pathway interrogation.
Screening & Assay Development
- Delivers standardized extracts suitable for quantitative HPLC analysis and assay calibration.
- Improves reproducibility and comparability across screening campaigns by optimizing extraction parameters.
- Enables scalable preparation of cannabinoid standards for high-throughput workflows.
Translational & Preclinical Research
- Provides consistent CBDA extracts for preclinical model dosing and biomarker studies.
- Supports translational continuity by aligning extraction outputs with analytical requirements.
- Reduces biological variability, enhancing risk-adjusted advancement decisions.
Pipeline & Workflow Integration
This UAE protocol integrates at the interface of compound sourcing and analytical validation, bridging early discovery with assay development and preclinical research.
- Discovery Biology: Supports hypothesis testing by enabling access to high-yield CBDA extracts for pathway studies.
- Screening: Provides reproducible, quantitative extracts for assay readiness and compound evaluation.
- Analytics: Delivers standardized outputs for HPLC-based quantification and cross-condition comparison.
- Translational Research: Aligns extraction quality with preclinical dosing and biomarker analysis needs.
- Enterprise Reuse: Establishes a scalable, adaptable extraction platform for diverse cannabinoid research programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in cannabinoid research.
- Operational Value: Standardizes extraction, improves reproducibility, and enables rapid scale-up.
- Strategic Value: Informs go/no-go decisions and enhances capital efficiency by reducing process variability.
- Portfolio Impact: Supports risk-adjusted prioritization and advancement of cannabinoid-based assets.
Implementation Considerations
- Requires expertise in solvent selection, sonication, and HPLC analytics.
- Needs access to ultrasonic bath, centrifugation, and analytical instrumentation.
- Demands cross-team standardization of extraction parameters for reproducibility.
- Adaptable to other cannabinoids and biomass types with protocol optimization.
- Extraction efficiency and selectivity depend on solvent polarity and concentration.
