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Temperature Control Minimizes Wax-Derived Alkane Carryover in Hydrocarbon Cannabis Extraction
Manuel E Sosa1, Twinkle R Paryani1, Randy J Reed2
1Department of Research and Development, Abstrax Tech, 2661 Dow Avenue, Tustin, California 92780, United States.
ACS Omega
|July 28, 2026
Summary
Lowering cannabis extraction temperatures reduces epicuticular waxes, minimizing long-chain n-alkanes in concentrates and inhaled aerosols. This preserves cannabinoid potency and aroma while improving safety.
Area of Science:
- Cannabis science
- Analytical chemistry
- Chemical engineering
Background:
- Hydrocarbon solvents are used for cannabis extraction, yielding concentrates with cannabinoids, terpenes, and a poorly understood
Purpose of the Study:
- To investigate the composition of cannabis "fats and waxes" and how extraction temperature affects their co-extraction.
- To determine the impact of extraction temperature on long-chain n-alkane content in cannabis concentrates.
- To assess the transfer of these n-alkanes into inhaled aerosols.
Main Methods:
- Gas chromatography-mass spectrometry (GC×GC-TOF-MS/FID) to identify and quantify compounds.
- Viscosity measurements to assess rheological properties.
- Aerosol capture experiments to evaluate transfer into mainstream aerosol.
Main Results:
- Long-chain n-alkanes (C22-C31), identified as epicuticular wax constituents, were major components whose abundance increased with extraction temperature.
- Cannabinoid and volatile aroma compound levels remained relatively constant across tested temperatures.
- N-alkanes transferred efficiently into mainstream aerosol, with aerosol wax levels linearly correlating to extract concentrations.
- Lowering extraction temperature significantly reduced n-alkane content in both the extract and aerosol.
Conclusions:
- Extraction temperature is a critical control point for minimizing epicuticular wax co-extraction in cannabis concentrates.
- Lower temperatures selectively reduce n-alkane content, preserving cannabinoid potency and aroma profiles.
- Extraction conditions directly influence consumer inhalation exposure to wax-derived constituents.
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