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Technology · Agri-food systems / Livestock & aquaculture

Industrial single-cell protein for feed

Microbial single-cell protein grown by fermenting methane, CO2/hydrogen or side-streams into a high-protein feed ingredient that displaces fishmeal and deforestation-linked soymeal.

Risk: medium FeedFishery & aquacultureAlternative proteins US · CN · EU · IN Science: why it works → verified 2026-06-26 · 5 Sources (0 independent)

1 · What it gives

Industrial single-cell protein (SCP) is microbial biomass — bacteria, yeast or filamentous fungi — grown by high-rate fermentation of cheap, non-arable substrates and processed into a high-protein feed ingredient. It directly substitutes the two strained legacy protein sources in animal and aquaculture diets: fishmeal, harvested by depleting wild fisheries, and soymeal, whose expansion drives deforestation. SCP carries roughly 60–80% crude protein with a favourable amino-acid profile (rich in lysine and methionine) and high digestibility above 90%, plus nucleic acids and beta-glucans that prime animal immunity. The dominant industrial platform is gas (methane) fermentation by obligate methanotrophs such as Methylococcus capsulatus, which oxidise methane to methanol via methane monooxygenase and assimilate it through the ribulose-monophosphate cycle; alternative platforms ferment CO2 plus hydrogen, or paper-mill and agro-industrial side-streams. By 2026 the sector has moved from pilot to world-scale, with commercial plants displacing imported soy and fishmeal and cutting feed carbon footprints by an estimated 70–90%.

The key directions of industrial single-cell protein are:

  1. Methane fermentation (Gas-to-protein): obligate methanotrophs grown on natural gas or biomethane in pressurised loop reactors; the most industrially mature platform, anchoring world-scale plants.
  2. Hydrogen/CO2 fermentation (Power-to-protein): hydrogen-oxidising autotrophic bacteria fix CO2 using hydrogen as the energy carrier, coupling SCP to captured carbon and renewable power.
  3. Fungal protein from side-streams (Mycoprotein): filamentous fungi such as Paecilomyces variotii grown on pulp-mill and agro side-streams, forming pellets that are recovered by simple sieving, slashing capital and operating cost.
  4. Downstream feed formulation: lysis, drying and granulation of biomass into a stable powder blended at 5–20% inclusion into aquafeed and poultry rations.

Sectoral value chain#

[Gas / side-stream feedstock] ──> [High-rate fermentation] ──> [Concentration (TFF / centrifuge)] ──> [Cell lysis & drying]
                                            │
                                  (Methanotrophs / fungi)
                                            │
                                            ▼
[Aquafeed & poultry rations] <─── [Feed formulation & extrusion] <─────┘

Value chain levels#

LevelDescriptionKey inputs/outputs
FeedstockPreparation of purified gas feed (natural gas, biomethane or CO2/hydrogen) and sterile compressed air or oxygen, plus a nitrogen source.In: Natural gas, oxygen, ammonia.
Out: Compressed sterile gas-air mixture.
FermentationContinuous culture of methanotrophs or fungi at high dilution rate in loop or stirred reactors.In: Gases, ammonia, phosphates, trace metals (copper for pMMO).
Out: Microbial broth at 15–25 g/L cell density.
ConcentrationDisc-stack centrifugation and ultrafiltration to a wet microbial paste, with water recycled to the front of the process.In: Culture broth.
Out: Microbial concentrate at 12–18% dry solids.
Downstream processingBrief high-temperature thermal lysis to inactivate enzymes, rupture cell walls and lower nucleic-acid content.In: Microbial paste.
Out: Lysed, digestible protein paste.
DryingSpray drying of the lysed paste into a fine free-flowing powder, optionally granulated.In: Lysed paste, hot air.
Out: Dry protein powder/granules below 6% moisture.
FormulationBlending SCP at 5–20% inclusion with fats and other ingredients in extruders into finished feed.In: SCP powder, feed-mill formulations.
Out: Finished extruded aquafeed/poultry feed.

Cross-cutting technologies of the sector:

  • U-Loop bioreactors: vertical down-and-up loops with a bottom U-bend where hydrostatic pressure rises to several bar, raising methane and oxygen solubility four-to-five-fold over stirred tanks and preventing substrate starvation in fast-growing cells.
  • Fungal pelletisation: culturing filamentous fungi so the mycelium aggregates into 1–2 mm pellets that are recovered by mechanical sieving instead of costly centrifuges, cutting capital and operating cost.
  • Degassing and safety systems: vacuum degassing of the broth before centrifugation to safely capture explosive residual methane and recycle it to the compressors.

2 · What it replaces 6 · matched by industry

D1E4Gas-fermented single-cell protein (methane, CO2 and industrial off-gas) instead of fishmeal and imported protein concentrates in feed
Replaces: Fishmeal from reduction fisheries and imported soybean/rapeseed protein concentrates in compound feed (as a formula share)
FEED
D1E–Insect meal, single-cell protein and algal ingredients instead of fishmeal and soybean meal in feed
Replaces: Fishmeal from reduction fisheries (anchoveta, sandeel); soybean meal from deforestation frontiers (with antinutritional factors and …
FEED
D1E–Precision-fermentation dairy and egg proteins (whey, casein, ovalbumin) and fungal biomass protein (mycoprotein) instead of a share of antibiotic- and land-intensive animal protein
Replaces: A share of conventional dairy and meat protein — and with it the antibiotics, antiparasitics, fertilizer and pesticide inputs of the …
NOVEL
D1E2Feed enzymes (phytase) and fermentation amino acids instead of inorganic phosphate and excess crude protein
Replaces: Dicalcium phosphate / rock-phosphate P supplements in pig and poultry feed; excess soybean-meal crude protein (ammonia, nitrate pollution); …
FEED
D1E–Enteric methane from cattle and sheep reduced by bromoform-containing red seaweed (Asparagopsis), essential-oil and plant-extract feed additives, and low-methane genetics — instead of unabated emissions and synthetic inhibitors alone
Replaces: Unabated enteric methane; reliance on the synthetic inhibitor 3-nitrooxypropanol (3-NOP) as the only approved tool; ionophore antibiotics …
FEED
D1E–Manure methane, ammonia and odour cut by anaerobic digestion with covered storage, low-protein diets balanced with fermentation amino acids, and biological air treatment of livestock houses — instead of open lagoons, sulfuric-acid slurry acidification and masking agents
Replaces: Open anaerobic lagoons and uncovered slurry stores; slurry acidification with concentrated sulfuric acid; chemical masking/neutralizing …
SERV

3 · How to implement 6 steps

  1. 1
    Substrate preparation and compressionFormulation & blending
    Natural gas (methane above 95%) is compressed to about 5 bar and blended with sterile air or pure oxygen. Gaseous ammonia is injected as the nitrogen source and pH regulator, and the gas mixture is fed to the bottom spargers of the loop reactor.
    Who can do this step matched automatically
    Vland Biotech 蔚蓝生物 (SSE 603739) China
    ✓ GMP+ / FAMI-QS industrial scale
    “Aquaculture Premix”
    Taiwan Sugar Corporation (TSC) Taiwan
    500,000 tons pilot scale
    “It refines sugar (including refined white sugar, golden brown sugar, fine granulated sugar and invert sugar syrup), produces bio-based chemicals/biotech outputs (alcohol, …”
    Yiming Biotechnology China
    ✓ FSSC 22000 ✓ ISO 22000
    “Ice Cream Premix Powder”
    Zhejiang NHU Company China
    ✓ GMP+ / FAMI-QS ✓ ISO 22000 industrial scale
    “Looking ahead, NHU will remain committed to advancing nutrition and health by leveraging its biotechnology, chemical synthesis, and microencapsulation technology platforms.”
    Advanced Enzyme Technologies (NSE) India
    ✓ FSSC 22000 ✓ GMP+ / FAMI-QS ✓ ISO 22000 500 m3
    “This is a satellite blending, mixing and formulation facility, located at Vashind near Shahapur and dedicated to the company’s Animal Nutrition business.”
  2. 2
    Continuous U-Loop fermentationFermentation & cultivation
    Fermentation runs as a continuous chemostat in a loop reactor. The aqueous medium carries phosphoric acid, magnesium sulphate, copper salts (cofactor for pMMO) and trace elements. The Methylococcus capsulatus culture circulates around the loop at roughly 2.5 m/s at about 42 °C and pH 6.5, with the dilution rate set so biomass stays near 20 g/L dry solids at near-complete methane utilisation.
    Who can do this step matched automatically
    Loopworm India
    ✓ GMP+ / FAMI-QS ✓ HACCP ✓ ISO 22000 6,000 tonnes/year industrial scale
    “At Loopworm, we are building the future of sustainable biomanufacturing.”
    Aum Enzymes / Infinita Biotech India
    “Aum Enzymes is a metabolic engineering firm specializing in generally regarded safe microbial origin Industrial, Food, Feed, Neutraceutical, cosmetic, plant origin [botonical] …”
    Unibio Denmark
    industrial scale
    “Unibio is a leading biotechnology company specialising in advanced gas fermentation technology.”
    Advanced Enzyme Technologies (NSE) India
    ✓ FSSC 22000 ✓ GMP+ / FAMI-QS ✓ ISO 22000 500 m3
    “Technology: microbial fermentation with ~500 m3 fermentation capacity; 15+ patents; developed/upscaled probiotic production technologies.”
  3. 3
    Degassing and concentration
    The broth is drawn off continuously into a cyclonic vacuum degasser to strip dissolved explosive gases, then fed to a disc-stack centrifuge. Cells concentrate into a wet paste at about 15% dry solids, and the clarified centrate returns to the head of the process for a closed water loop.
  4. 4
    Thermal-shock lysis
    A high-pressure pump drives the paste into a tubular lysis reactor where direct steam injection flash-heats it to around 125 °C at about 3.5 bar for tens of seconds. Cell walls rupture and intracellular RNA degrades, lowering purine content; the released protein concentrate is then cooled.
  5. 5
    Spray dryingPurification & downstreamField application & services
    The lysed concentrate is sprayed into a drying tower against a counter-current of sterile hot air near 180 °C, forming microdroplets that dry instantly. Exhaust air is held near 85 °C to protect amino acids, and dry particles are recovered by cyclones and bag filters to below about 5.5% moisture.
    Who can do this step matched automatically
    Keclon Argentina
    ✓ FSSC 22000 60,000 liters industrial scale
    “Maximize volumetric productivity and downstream processing at pilot scale”
    Esco Aster Singapore
    ✓ FSSC 22000 ✓ ISO 22000 5,000 L industrial scale
    “Adherent cell culture and downstream processing: commercialized Tide Motion bioreactor platform (MiniTide to TideXcell) with closed automated cell harvesting and single-use …”
  6. 6
    Cooling, packing and quality controlTesting & analytics
    The powder is fluidised-bed cooled and sent to a silo. QC verifies crude protein (around 70–72% on a dry basis), moisture below 6%, the lysine and methionine profile, and absence of pathogens and heavy metals before the product is packed into bulk bags and shipped to feed mills for salmon, shrimp and poultry rations.
    Who can do this step matched automatically
    Esco Aster Singapore
    ✓ FSSC 22000 ✓ ISO 22000 5,000 L industrial scale
    “Esco Aster (Singapore) is a cGMP contract research, development and manufacturing organization (CRDMO/CDMO) and bioinnovation venture accelerator that helps clients and …”
    BRAIN Biotech Germany
    ✓ FSSC 22000 industrial scale
    “As a contract research organization (CRO), we provide smart, rapid, and effective solutions using cutting-edge technologies to drive customer success.”

4 · Who delivers

Matched suppliers (matched automatically)

UnibioDenmarkProduceractive
String BioIndiaResearch / RTOactive
CalystaUnited StatesProduceractive
Solar FoodsFinlandResearch / RTOactive
PBS BiotechUnited StatesServices / consultingactive
Simple PlanetSouth KoreaProduceractive
IntegricultureJapanEquipmentactive
LoopwormIndiaServices / consultingactive
RemilkIsraelNot classifiedactive
ADM / Sophie's BioNutrientsSingaporeProduceractive

Listed suppliers

String Bio · Unibio

In the services and supply catalogue 1 · paid service

Nutrients & supplements

Leading companies and institutes (from the brief)

Company / InstituteCountryKey products / platformsTech featuresStatus 2026
Calysta🇺🇸 USAFeedKindMethanotroph gas fermentation of M. capsulatuscommercial
Calysseo🇨🇳 ChinaFeedKind (Asia)First commercial-scale gas-protein plant, Chongqingsuspended (plant idle; JV support withdrawn 2026)
Unibio🇩🇰 DenmarkUniproteinPatented U-Loop methane loop reactorscommercial
Enifer🇫🇮 FinlandPekiloFungal protein from pulp-mill side-streams, sieve recoveryoperating
Deep Branch🇬🇧 United KingdomProtonCO2 and hydrogen gas fermentationpilot
String Bio🇮🇳 IndiaPROSEIMulti-substrate biomethane gas fermentationpilot

5 · Rules & route to market

Route into Russia / EAEU: FEED · Rosselkhoznadzor (expertise by VGNKI)
state registration within 45 working days after acceptance of documents (plus dossier and tests)
Information, not legal advice — confirm the procedure for your product. (2026-10-06)
United States

The United States hosts the leading venture-backed methanotroph developers and the commercial partnerships that route gas protein into aquaculture and pet-food markets.

Methanotroph gas fermentation, FeedKind, FDA safety status#

  • Calysta and FeedKind: Calysta pioneered methanotroph gas fermentation, producing the single-cell protein FeedKind from Methylococcus capsulatus with high nutritional value for aquaculture and pet diets.
  • Commercial routes to market: Calysta pairs its production technology with established feed and ingredient distributors to scale FeedKind into global salmon, shrimp and pet-food supply chains.
  • Regulatory safety: FeedKind has been recognised as safe for feed use, confirming the biological safety of microbial protein for a broad range of animals.
European Union

The European Union leads on fungal and bacterial protein from industrial side-streams, backed by hard regulatory pressure to decarbonise the feed base.

U-Loop methane protein, Pekilo mycoprotein, EUDR demand pull#

  • Unibio and U-Loop: Denmark’s Unibio developed a continuous U-Loop methane-fermentation technology for its Uniprotein product and licenses it internationally; with the Saudi Industrial Investment Group it is building a plant of 50,000 tonnes per year, with expansion planned toward 300,000 tonnes per year.
  • Enifer and Pekilo: Finland’s Enifer is reviving the historic Pekilo mycoprotein process, fermenting Paecilomyces variotii on pulp- and agro-industrial side-streams; its Finnish plant of about 3,000 tonnes per year is slated to begin supply in 2026, with the product cleared by EFSA for fish and pet feed.
  • EUDR pull: as the EU Deforestation Regulation restricts soy from cleared land, demand for local single-cell protein in Europe is rising sharply.
China

China is the principal force in industrial scale-up, hosting the first commercial-scale gas-protein plant and treating microbial protein as a national feed-security priority.

Chongqing FeedKind plant, MARA approvals, soy-import substitution#

  • Calysseo at Chongqing: Calysseo — the Calysta and Adisseo joint venture — commissioned a commercial-scale gas-protein plant in Chongqing supplying FeedKind to Asia’s large aquaculture sector and displacing imported fishmeal.
  • MARA approvals: China’s agriculture regulator (MARA) cleared microbial protein for use in salmonid, shrimp and pet diets, opening multi-tonne contracts with major feed mills.
  • Feed-security driver: importing the bulk of its soy, China treats domestic gas-protein production from natural gas or coke-oven methane as a strategic food-security direction.

6 · Money: tenders & grants

GrantDevelopment of cell-free protein synthesis platforms for discovery and/or production of biologicals
European Commission · EU
Apr 13, 2027
179 days

7 · Tech stack & innovations

The modern SCP plant is built on three engineering pillars that manage gas mass-transfer, biomass recovery and product digestibility.

  1. U-Loop fermenters:
    • Stainless-steel loop reactors with high-area heat-exchange jackets, because methane oxidation releases very large heat loads — on the order of 35 MJ per kg of dry biomass.
    • Dissolved-oxygen and methane sensors regulate gas feed inside the loop to keep the mixture outside the explosive envelope.
  2. Disc-stack centrifuges:
    • High-g disc-stack separators concentrate cells of roughly 1.05 g/cm³ density into a thick paste while clarified water returns to the fermenter recycle.
    • Continuous solids discharge sustains the high-throughput, steady-state operation that gas fermentation requires.
  3. Thermal-lysis reactors:
    • Tubular flow reactors flash-heat the concentrate to around 120–125 °C for tens of seconds, rupturing cell walls and degrading nucleic acids to lower purine load in monogastric animals.
    • The lysed concentrate is cooled before drying, raising protein digestibility for downstream feed use.

Sources 5 · 0 independent · 5 producer sites

Producers' own sites 5

  1. Unibio producer checked 2026-05-21 · link not kept
  2. Enifer producer checked 2026-06-02 · link not kept
  3. Deep branch producer checked 2026-04-25 · link not kept
  4. String bio producer checked 2026-05-21 · link not kept
  5. Calysseo producer checked 2026-06-26 · link not kept