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Euphorbia lathyris, which has been the subject of hydrocarbon plant research for many years
Hydrocarbon plants are plants that follow certain metabolic pathways that produce hydrocarbon products similar to petroleum. These
hydrocarbon products are called terpenoids.[1] The plants that produce terpenoids in large enough quantities
to be harvested can be as big as trees or as small as single-cell algae. The family Euphorbiaceae has been studied in detail by
Dr. Melvin Calvin, Nobel Laureate, and discoverer of the Calvin Cycle.
One particular tree of the genus Hevea, more commonly known as the rubber tree, is probably the most famous hydrocarbon plant,
supplying an estimated one third of the world’s rubber demand. It is still not as quick and cheap to make as petroleum-based rubber,
which is why it does not occupy a larger portion of the market.[2]Hevea naturally produces a latex substance which can tapped by cutting into the tree, and the latex can then be processed into rubber.
Most hydrocarbon plants are not trees, so this technique of tapping the tree is no longer feasible. Instead of tapping the tree, the hydrocarbons are extracted using various organic solvents. This process is especially useful with single-cell algae, such
as Botryococcus braunii. This algae has two forms, both of which live in brackish water. The first form is a red algae that
produces odd-numbered carbon chains roughly 25-31 atoms in
length.[2] These carbon chains usually do not possess a large number of double bonds. The
second type of B. braunii is green and produces even-numbered carbon chains that are between 34 and 38 carbons long, with
many double bonds present. While the cause of this difference is not well-studied, the two different algae can be used for discrete
purposes.
Dr. Calvin began his studies of hydrocarbon plants in 1977 by looking at yields of Euphorbia lathyris over two years. While his results were limited, due to growing season complications,[3] he did find a substantial amount of hydrocarbon products. Once the plant samples were separated using adsorption chromatography and column chromatography, they were analyzed via mass spectrometry, IR spectroscopy, UV spectroscopy, and gas chromatography, 31-and-34-carbon-long alkane chains were found to be present in the hexane layer of the adsorption chromatography[3]
^"Hydrocarbon plants". www.grasys.com (in Russian). Retrieved 2017-04-22.
^ ab[1][dead link]
^ abCalvin, Melvin, Esther K. Nementhy, and John W. Otvos. "HYDROCARBONS & ENERGY FROM PLANTS." (1978): n. pag. eScholarship. University of California, 20 June 2011. Web. 16 Apr. 2013.
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