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Processing and extraction methods of medicinal cannabis: a narrative review
Open accessAbstract
Introduction: As the cannabis industry transitions from a black market to a legal market, product development, and methods of extraction have become a focal point. To date, more than thousands of chemical constituents have been identified from the cannabis plant, all of which possess different chemical properties that require different conditions for preservation during drying and extraction. However, scientific publications that explore these areas for the cannabis plant are currently lacking. Method: This is a narrative review paper which focuses on critiquing drying and extraction methods of Cannabis sativa L. plant. Relevant keywords such as medicinal cannabis, extraction, solvent, cannabinoids, and terpenes have been searched in PubMed, EMBASE, MEDLINE, Google Scholar, and Cochrane Library (Wiley) databases. Result: To find relevant papers for this narrative review, 93 papers have been reviewed. Among them, 12 irrelevant papers were discarded. The excluded papers were either about hemp seed oil or hemp fiber and protein. Based on this review, solvent extraction is the most common method for cannabis plants. Although solventless and hydrodynamic extraction are known for their high yield and feasibility, more investigation is needed in these areas. Regarding the drying process, hang-drying is the most convenient method; however, it may be substituted by freeze-drying in the near future. Discussion: This review analyses various drying and extraction processes to guide the selection of suitable methods for various types of cannabis products and applications. This is done by outlining traditional and modern methods of drying techniques, exploring the importance of solvents for extraction, visiting solventless extraction procedures, and finally comparing conventional and alternative methods of extraction. Conclusion: In conclusion, based on the current knowledge, using organic solvents is the most convenient method for medicinal cannabis extraction. However, more research is needed for some of the drying and extraction methods. Also, developing a green and sustainable cannabis extraction method should be considered for future studies.
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“However, as a rule, the development of products that exploit these compounds’ bioactive or technological potential is based on separation processes classified as solid-liquid extraction, which is a critical processing step with a broad spectrum of exploitation [39].”
From Supercritical Carbon Dioxide Technology for Recovering Valuable Phytochemicals from Cannabis sativa L. and Valorization of Its Biomass for Food Applications (2023) · cites this paper as [39]
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“Storage moisture was maintained at approximately 80% (Das et al., 2022; Lazarjani et al., 2021).”
Essential oil fractions of hemp profiles at different hydro-distillation periods
Zheljazkov, V., Sikora, V., Astatkie, T., Dincheva, I., Aćimović, M., Visković, J., Latković, D., & Noller, J. S. (2025) · PLoS ONE · doi:10.1371/journal.pone.0331767 · Cited by 2
Fettoukh, N., Fadil, M., Stambouli, H., Bouri, A. E., Bouyoun, T., Annemer, S., Boukhaled, A., & Farah, A. (2025) · Scientific Reports · doi:10.1038/s41598-025-03888-7 · Cited by 2
“…and polymeric compounds 38 ; (2) volatilization of terpenes and adsorption of cannabinoids to packaging materials may reduce recoverable mass 22,35 ; (3) analytical limitations (GC/FID) precluded quantification of acidic precursors (THCA, CBDA) and non-volatile degradation byproducts 31,34 .”
Monton, C., Charoenchai, L., Suksaeree, J., & Songsak, T. (2025) · Journal of Separation Science · doi:10.1002/jssc.70278 · Cited by 2
Chemical characterization of hemp seeds ( Cannabis sativa L.) cultivated in the Ecuadorian Andes
García, H. F. S., Delgado, L. F. V., de la Rosa, A., Crisanto, S. L. F. S., Londoño‐Larrea, P., Gonzalez-Benitez, D., & Montúfar-Delgado, C. (2025) · CyTA - Journal of Food · doi:10.1080/19476337.2025.2520539 · Cited by 1
“Lipid analysis (AOAC 2003.05) was carried out via solvent extraction via the Soxhlet method, which employs 5 g of hemp seed; lipids were extracted with benzene, and after solvent evaporation, the fat content was determined by weight difference.”
InfluentialCrew, J., Wu, Y., Mu, R. R., & Patras, A. (2025) · Molecules · doi:10.3390/molecules30102116 · Cited by 2
“Furthermore, when evaluating different extraction methodologies, ethanol used in conjunction with DM was observed to extraction (UAE) [11].”
Phuyal, A., Poudel, M. K., Bhandari, R., Budhathoki, S., Baral, D., Bhattarai, A., & Chaudhary, N. K. (2024) · Butwal Campus Journal · doi:10.3126/bcj.v7i2.73175 · Cited by 2
“Afterward, the powdered sample was dried in a laboratory oven at 37°C for two days to eliminate moisture prior to the extraction process (Lazarjani et al., 2021).”
Injamum-Ul-Hoque, M., Rahman, M. M., Howlader, N. C., Tavakoli, S., Rahman, M. M., Imran, S., Bulle, M., Ahsan, S. M., & Choi, H. W. (2025) · Phyton · doi:10.32604/phyton.2025.069827 · Cited by 2
“The therapeutic potential of C. sativa has been explored for its anti-inflammatory, analgesic, anticancer, antioxidant, neuroprotective, and gastrointestinal benefits, as well as its use in epilepsy management [3].”
Temperature Control Minimizes Wax-Derived Alkane Carryover in Hydrocarbon Cannabis Extraction
Sosa, M. E., Paryani, T. R., Reed, R., Siegel, A. W., Ai, Q., Lee, E., Radford, D., Martin, T. J., Koby, K. A., & Oswald, I. W. H. (2026) · ACS Omega · doi:10.1021/acsomega.5c13451 · Cited by 1
Vyshnevskа, L., Yaromiy, M. V., Пестун, І. В., Georgiev, K. D., Slavov, I. Z., & Коshovyi, O. (2026) · Scientia Pharmaceutica · doi:10.3390/scipharm94020041 · Cited by 1
“A number of articles are devoted to extraction methods [21–23], analytical techniques [24], and quality control [25].”
Laflamme, G., Hamzeh-Cognasse, H., Cognasse, F., & Loubaki, L. (2026) · Platelets · doi:10.1080/09537104.2026.2644368 · Cited by 1
Fuentes, G., Echarte, S. M., Parise, A., Ramírez, C. L., & Orallo, D. (2026) · Phytomedicine Plus · doi:10.1016/j.phyplu.2026.100965 · Cited by 1
A molecular dynamics solvation study of CBD and Δ 9 -THC in sc C O 2
Vásquez, F. J., & Orozco, G. A. (2025) · Journal of Molecular Liquids · doi:10.1016/j.molliq.2025.129094 · Cited by 1
Smith, M. L., Bernal, A. J., Weil, R. E., McKinney, W. J., & Hoeng, J. (2025) · Current Opinion in Toxicology · doi:10.1016/j.cotox.2025.100555 · Cited by 1
Singh, M. K., Sen, S., Singh, S., Aftab, N., Kumar, B., Gupta, N., Tandon, S., Bawankule, D. U., & Verma, R. S. (2025) · Journal of Ethnopharmacology · doi:10.1016/j.jep.2025.120856 · Cited by 1
Haczkiewicz, M., Świtalska, M., Łyczko, J., Wietrzyk, J., & Gliszczyńska, A. (2025) · Molecules · doi:10.3390/molecules30204148 · Cited by 1
“…extract weight was observed after extraction with hexane at 25 ◦ C, amounting to 49% of the original extract mass. Hexane, being a non-polar solvent, promotes the extraction of waxes and lipid-like substances [19]; thus, although the loss was substantial, it is consistent with expectations [20].”
Haidery, Q. U. A., Shen, Y., Niu, J., Yan, C., Xu, Z., Han, B., Wang, J., Wang, Y., Ma, X., & Zheng, W. (2025) · Biocatalysis and Agricultural Biotechnology · doi:10.1016/j.bcab.2025.103636 · Cited by 1
Ataolahi, S., Lu, H. T., Li, W., Deseo, M. A., Stevens, G. W., Bacic, A., Doblin, M. S., & Mumford, K. A. (2025) · Separation and Purification Technology · doi:10.1016/j.seppur.2025.133675 · Cited by 1
Ntsoane, T., Nemukondeni, N., & Nemadodzi, L. E. (2024) · Metabolites · doi:10.3390/metabo14120712 · Cited by 1
“Cannabis sativa , commonly known as marijuana (Figure 1), is a herbaceous flowering annual plant that belongs to the family of Cannabaceae and the genus Cannabis [1,2].”
The Elusive Truth of Cannabinoids for Rheumatic Pain
Clarke, H. A., Miles, S. J., Peer, M., & Fitzcharles, M. (2024) · Current Rheumatology Reports · doi:10.1007/s11926-024-01162-9
“The product may then be reconstituted in a carrier liquid such as edible oils of olive, cocoFnut, or hemp [44].”
Delgado-Rodríguez, J., Romero, P. A. A., & Benítez, R. B. (2023) · Ciencia e Ingeniería Neogranadina · doi:10.18359/rcin.6588 · Cited by 1
“Estas metodologías deben estar enmarcadas en la química verde y la economía circular [12].”
BackgroundAnalytical strategies for herbal Cannabis samples in forensic applications: A comprehensive review
Slosse, A., Durme, F. V., Eliaerts, J., Samyn, N., Mangelings, D., & Heyden, Y. V. (2023) · Wiley Interdisciplinary Reviews Forensic Science · doi:10.1002/wfs2.1479 · Cited by 2
Recovery of cannabinoids from Cannabis sativa flowers using modifier/water leaching method
Lu, H. T., Li, W., Deseo, M. A., Stevens, G. W., Bacic, A., Doblin, M. S., & Mumford, K. A. (2025) · Separation and Purification Technology · doi:10.1016/j.seppur.2025.136141 · Cited by 1
Sui, X., he, D., Li, P., Zhu, L., Xie, Y., Ye, T., Zhou, L., & Xie, S. (2026) · Molecules · doi:10.3390/molecules31213872
The Dynamics of Industrial Hemp within Circular Economy Systems: A Review
Zishiri, R. M., Mhuru, E. W., Maphosa, M., Parwada, C., Mhlahlayazi, M., Haripo, T. T., & Mutetwa, M. (2026) · Agricultural Reviews · doi:10.18805/ag.rf-441
“They are made from leaves, seed and flower extracts (Lazarjani et al ., 2021).”
Zhang, B., Nan, J., Zhang, Y., Zhang, B., Ke, C., Wang, W., Wu, T., Xia, J., Yang, F., He, M., et al. (2026) · European Journal of Medicinal Chemistry · doi:10.1016/j.ejmech.2026.119360
Jaroenkunpanit, P., Wungsintaweekul, J., & Chetpattananondh, P. (2026) · ACS Food Science & Technology · doi:10.1021/acsfoodscitech.6c00127
Ortiz, R. S., Pereira, D., Mariotti, K. D. C., & Camargo, F. A. D. O. (2026) · Journal of Pharmaceutical and Biomedical Analysis · doi:10.1016/j.jpba.2026.117665
Mitochondrial dysfunction and autophagy activation underlie NK cell impairment induced by Cannabis
Bolduc, A., Tremblay, T., Almutairi, M., Semlali, A., & Loubaki, L. (2026) · PLoS ONE · doi:10.1371/journal.pone.0350750
“The cannabis joint extract (CJE) was prepared using a passive extraction method [21].”
Metadata
- Authors
- Lazarjani, M. P., Young, O., Kebede, L., & Seyfoddin, A.
- Affiliations
- Auckland University of Technology (NZ)
- Corresponding author
- Seyfoddin, Ali
- Venue
- Journal of Cannabis Research
- Published
- 2021-07-19
- Volume
- 3
- Issue
- 1
- Pages
- 32-32
- ISSN
- 2522-5782 (ISSN-L)
- PMC
- PMC8290527
- OpenAlex
- W3184094075
- Cited by
- 144
- References
- 62
- Citations by year
- 2026: 23 · 2025: 47 · 2024: 29 · 2023: 25 · 2022: 19
- FWCI
- 2.31
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Journal of Cannabis Research (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Tuwhera (Auckland University of Technology) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Health Sciences › Medicine › Pharmacology (medical) › Cannabis and Cannabinoid Research
- Life Sciences › Agricultural and Biological Sciences › Food Science › Agricultural and Biological Research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Phytochemistry Medicinal Plant Applications
- Keywords
- medical cannabis, Cannabis sativa, drying methods, solvent extraction, solvent-free extraction, cannabinoids, terpenes, freeze-drying, green extraction
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