Engineered microbes have produced methyl halides using non-food biomass in a laboratory study, but the evidence establishes potential—not an industrial process. A 2009 paper reported engineered yeast productivity of 190 mg/L-h on glucose and sucrose and described production from unprocessed crop residues and poplar in a microbial co-culture.
How microbes can make methyl halides from biomass
The biological route uses methyl halide transferase (MHT), an enzyme that transfers a methyl group from S-adenosyl methionine (SAM) to a halide ion. Researchers synthesized and screened 89 putative MHT genes from plants, fungi, bacteria, and other database sources. In tests in Escherichia coli, 56% of the library was active on chloride, 85% on bromide, and 69% on iodide. These percentages describe that study’s gene library and screening conditions; they are not general performance rates for MHT enzymes.
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The researchers then engineered Saccharomyces cerevisiae with a high-activity MHT. The 2009 paper reports productivity of 190 mg/L-h when using glucose and sucrose. The figure is a laboratory result reported by the study, not a commercial production benchmark. Read the study’s PubMed record.
What the biomass-waste experiments showed
To use plant material that had not first been processed into simple sugars, the researchers paired the engineered yeast with the cellulolytic bacterium Actinotalea fermentans. The co-culture produced methyl halides from four unprocessed feedstocks:
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- Switchgrass (Panicum virgatum)
- Corn stover
- Sugar cane bagasse
- Poplar (Populus sp.)
This is evidence that the approach could draw on agricultural residues and woody biomass rather than relying only on food-derived sugars. The reported 190 mg/L-h figure is for glucose and sucrose; the source does not give that same productivity figure for each unprocessed feedstock.
Laboratory potential is not commercial readiness
The study is a proof of concept. The sources reviewed do not establish current commercial production, updated performance benchmarks, process economics, or a methyl-halide-specific pilot project. They also do not provide a lifecycle assessment or a quantified comparison with conventional production. It would therefore be premature to describe this route as cost-competitive, carbon-negative, or climate-neutral.
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The U.S. National Renewable Energy Laboratory describes general capabilities in biomass scale-up, separations, catalytic pathways, and pilot work, as well as facilities available to research and industry partners. Those general capabilities are not evidence that NLR is piloting methyl-halide biosynthesis. NLR’s bioenergy capabilities and Thermal and Catalytic Process Development Unit may be relevant background for organizations exploring biomass process development.
Biological production is different from emissions from burning biomass
Methyl halides made deliberately by engineered microbes should not be confused with methyl chloride released when biomass burns. A 1995 field study in Equatorial Africa estimated that biomass burning accounted for 10–40% of global methyl chloride turnover. Its best estimate was 515 × 109 g/y, with a range of 226–904 × 109 g/y. These are historical atmospheric source estimates, not fermentation yields or measures of engineered-microbe production. See the field study’s PubMed record.
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Uses, regulation, and handling are chemical-specific
Methyl halides have been described as fumigants and as chemical precursors that can be catalytically converted into other chemicals and fuels. Their uses and risks are not interchangeable, however, and regulatory details for one compound should not be generalized to the whole group.
Methyl bromide and U.S. restrictions
The U.S. Environmental Protection Agency identifies methyl bromide as an ozone-depleting substance: “Methyl bromide is a fumigant used to control pests in agriculture and shipping. Methyl bromide also depletes the ozone layer.” EPA states that U.S. production and consumption were phased out effective January 1, 2005, with critical-use and quarantine/preshipment exceptions. EPA also describes alternatives for some uses, including steam sterilization for certain soil and pest combinations and integrated pest management. These statements concern methyl bromide in the United States, not every methyl halide or every jurisdiction. EPA’s methyl bromide information was updated March 10, 2026.
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Occupational handling
NIOSH describes methyl chloride, methyl bromide, and methyl iodide as volatile chemicals often contained in closed systems, with possible exposure at equipment connections, pump seals, sight glasses, and sampling points. This is general context from a historical occupational-health report, not a current exposure standard or a substitute for chemical-specific safety data and applicable legal requirements. Consult the NIOSH report.
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