The Rise of Rubisco (A Perfect plant protein)

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A plant protein that could replace beef if it lives up to the hype. And it might.

Rubisco, which stands for ribulose-1,5-bisphosphate carboxylase/oxygenase, is found in every green leaf. It’s the heavy hitter responsible for photosynthesis. Scientists talk up its qualities: it has a complete amino acid profile and can be made into a white, neutral-tasting powder. It can be gelled, emulsified, and made into just about anything. It doesn’t seem to cause allergies in people, which can’t be said for dairy or soy. Rubisco is easy to digest, compared to most plant proteins. And it’s incredibly abundant.

“From a food-ingredient point of view, it’s one of the best natural proteins out there,” says Slavko Komarnytsky, a biologist at the Plants for Human Health Institute at NC State University. Milne, of Leaft, calls it the “utopia” protein because it has so many good attributes.

Pat Brown, founder of the alternative-meat company Impossible Foods, told the New Yorker in 2019 that rubisco worked better than any other protein the company tried when making a prototype burger, but they didn’t end up using rubisco in burgers because they could not find enough of it.

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#2

Very exciting for the farmer, thanks for the heads up. Currently the process of extraction is so hard and expensive that it doesn’t really work. They are coming up with GMO plants which will give up more rubisco easier and it could actually work in the future. Apparently it’s a perfect protein, even better than meat and eggs. Great emulsifier and no flavor to deal with. So close to a perfect food. We just have to figure out how to do it cheaply.

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Market Availability Status

There are currently no consumer-oriented internet resellers that sell ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) in 1 to 10kg bags. The market for isolated Rubisco remains strictly divided between low-volume, high-cost R&D chemical suppliers and early-stage business-to-business (B2B) agricultural biotechnology firms that do not offer direct retail pricing or consumer-facing digital storefronts.

Structural Bottlenecks to Commercialization

While Rubisco is recognized as a nutritionally complete protein with an essential amino acid profile and gelation performance comparable to animal proteins like casein and whey, industrial-scale extraction for human consumption remains highly constrained (Pearce & Brunke, 2022).

  • Extraction and Purification Hurdles: Isolating native Rubisco requires separate, intensive processing to detach the protein from the green leaf biomass while fully removing green pigments (chlorophyll) and bitter, astringent polyphenols (Balfany et al., 2023; Grácio et al., 2023).
  • Scale and Infrastructure Deficits: Major food technology companies (such as Impossible Foods) historically abandoned early product prototypes utilizing Rubisco as a structural binder because no scaled agricultural processing infrastructure existed to manufacture the protein isolate reliably (Pearce & Brunke, 2022).

Current B2B and R&D Providers

Biotech entities currently focusing on commercializing leaf-protein concentrates or isolates operate strictly on a contract or venture-backed partner model (García Martínez et al., 2025).

Provider Type Entities / Suppliers Estimated Pricing & Scale
B2B Biotech Innovators Plantible Foods (extracting from duckweed/Lemna), Leaft Foods (extracting from alfalfa/leafy crops), Rubisco Foods Proprietary wholesale pricing. Supply is limited to pilot batches for commercial food manufacturing partners rather than public sale.
Scientific R&D Suppliers MilliporeSigma / Sigma-Aldrich, Fisher Scientific, Cayman Chemical $150 to $400 per milligram. Scaling this to a 1 to 10kg quantity is cost-prohibitive (exceeding hundreds of millions of dollars) and restricted to laboratory use.

Knowledge Gaps and Required Data

To establish transparent retail market pricing for bulk consumer applications, the following industry milestones must first be achieved:

  1. Standardization of Yield Data: Publicly verifiable pilot plant processing data indicating the exact capital and energy costs required to process raw input mass (e.g., wet alfalfa or duckweed) into a dry, white Rubisco isolate.
  2. Regulatory Milestones: Broad FDA Generally Recognized as Safe (GRAS) clearances and European Food Safety Authority (EFSA) novel food approvals across a wider array of crop sources to allow open-market bulk trading.

References

Balfany, C., Gutierrez, J., Moncada, M., & Komarnytsky, S. (2023). Current status and nutritional value of green leaf protein. Nutrients, 15(6), 1327. https://doi.org/10.3390/nut15061327 Cited by: 32

García Martínez, J. B., Behr, J., Pearce, J., & Denkenberger, D. (2025). Resilient foods for preventing global famine: a review of food supply interventions for global catastrophic food shocks including nuclear winter and infrastructure collapse. Critical Reviews in Food Science and Nutrition, 1–27. https://doi.org/10.1080/10408398.2024.2431207 Cited by: 17

Grácio, M., Oliveira, S., Lima, A., & Boavida Ferreira, R. (2023). RuBisCO as a protein source for potential food applications: A review. Food Chemistry, 419, 135993. https://doi.org/10.1016/j.foodchem.2023.135993 Cited by: 65

Pearce, F. G., & Brunke, J. E. (2022). Is now the time for a Rubiscuit or Ruburger? Increased interest in Rubisco as a food protein. Journal of Experimental Botany, 74(2), 627–637. https://doi.org/10.1093/jxb/erac414 Cited by: 43

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