Marine peptides & nutraceuticals

01Overview and value chain

Markers: [EC: EU Waste Framework Directive / Circular Bioeconomy | OECD: Marine Bioeconomy | Regulator: FDA (USA), EFSA (EU), NMPA (China)]

Marine peptides and nutraceuticals from fishery by-products is a high-value circular-bioeconomy stream that turns the 50–70% of fish mass (heads, skin, bones, scales, viscera) historically discarded or down-cycled into feed meal into premium ingredients for nutraceuticals, cosmeceuticals and functional food. These by-streams are a rich source of animal protein, collagen, omega-3 polyunsaturated fatty acids and bioactive peptides. With modern enzymatic hydrolysis, ultrafiltration and spray-drying, fish off-cuts become premium marine-collagen peptides whose low molecular weight (<2 kDa) gives them markedly higher bioavailability than bovine or porcine collagen. Bioactive peptides split out by specific proteases show ACE-inhibiting anti-hypertensive, antioxidant, anti-inflammatory and immunomodulatory activity, underpinning supplements and geroprotective formats. The 2026 market is expanding fast, driven by the EU Zero-Waste stack of food-waste rules and a global swing to clean, hypoallergenic (halal, kosher) protein sources.

The key directions of marine peptides & nutraceuticals are:

1. Low-molecular-weight marine collagen (Low-MW Marine Collagen): type I and III peptides extracted mainly from cod-family skin (cod, haddock, pollock), neutral in taste and odour, used to stimulate endogenous collagen synthesis in skin and joints.
2. Fish protein hydrolysates (Fish Protein Hydrolysates): deep hydrolysates of muscle tissue, heads and viscera carrying a balanced essential-amino-acid and short-peptide profile, used in sports nutrition and hypoallergenic diets.
3. Chitosan and glucosamine (Chitosan & Glucosamine): produced by deacetylation of chitin from crustacean shells (shrimp, crab); chitosan is a fat-and-toxin sorbent and a biodegradable preservation film.
4. High-purity omega-3 EPA/DHA concentrates (High-Purity Omega-3): extracted from liver and viscera oil by supercritical-fluid extraction that prevents oxidation of the unstable lipids.

Sectoral value chain

[By-catch streams (skin, heads)] ──> [Enzymatic hydrolysis] ──> [Membrane ultrafiltration]
           │                                    │                              │
    (port-side sorting)                 (bond cleavage)              (<2 kDa fractionation)
                                                                       │
[End products (collagen, supplements)] <─── [Spray drying] <──────────┘

Value chain levels

Cross-cutting technologies of the sector:

• Mild directed enzymatic hydrolysis (Enzyme-Assisted Hydrolysis): combinations of high-specificity plant, animal and microbial proteases cleave defined peptide bonds, minimizing the free hydrophobic amino acids that make hydrolysates bitter.
• Tangential membrane filtration (Cross-Flow Filtration): the feed flows parallel to the membrane surface, preventing pore fouling and letting peptides be size-fractionated continuously (e.g. 1–3 kDa for cosmetics, 3–5 kDa for joints).
• Microencapsulation and nanoemulsions (Microencapsulation): unstable peptides and omega-3 are sealed in liposomal or maltodextrin shells that mask fish taste and shield the actives from oxidation and gastric juice.

02US

The US leads consumption of sports and anti-ageing marine collagen, integrating it into functional drinks and ready-to-mix nutrition, while the FDA gates new marine-peptide ingredients through a strict GRAS process.

Cargill marine collagen, circular Alaska fish-oil, FDA GRAS validation

• Cargill marine collagen: the US food conglomerate runs food- and cosmetic-grade marine collagen lines, sourcing and processing wild cold-water fish skins into soluble premixes for American beauty-and-health brands.
• Circular Alaska fish oil: processors along the Alaska coast recover high-purity omega-3 concentrate from wild salmon and pollock by-products, cutting imported feedstock and the carbon footprint of the US seafood chain.
• FDA GRAS validation: marine-peptide makers must clear the FDA GRAS process, proving the absence of residual heavy metals (mercury, cadmium) and pathogenic toxins before ingredient use.

03CN

China is the world’s largest processor of aquatic biomass, running giant deep-processing clusters for fish by-products in Shandong province that supply export volumes of high-purity collagen powder.

YSFRI R&D, Shandong biorefineries, scale-up of fish collagen peptides

• YSFRI R&D in Qingdao: the Yellow Sea Fisheries Research Institute is China’s lead state centre for marine-by-product biotech, holding dozens of patents on combined collagen, hyaluronic-acid and sulfated-polysaccharide recovery from fish scales and cartilage.
• Shandong Peninsula biorefineries: Shandong concentrates the country’s largest seafood-processing capacity, with plants such as Shandong Oriental Ocean turning hundreds of thousands of tonnes of fish off-cuts into cheap, high-purity collagen powder for export to Asia and Europe.
• Industrial scale-up of collagen-peptide extraction: Chinese lines use automated fermenters up to 100 m³ and very large spray dryers, delivering collagen at industrial scale with low operating cost.

04EU

The European Union is the world’s main supplier of eco-certified premium wild-North-Sea fish collagen, built on the EU circular-economy rulebook and a strong Norwegian blue-bioeconomy cluster.

Seagarden & Hofseth blue biotech, Copalis B2B ingredients, EFSA Novel Food

• Seagarden (Norway): a leading European producer of pure collagen from wild Arctic cod skin caught in the clean waters of the Norwegian and Barents seas, MSC-certified and sold in more than 40 countries.
• Hofseth Biocare enzymatic hydrolysis: a Norwegian biotech running a patented continuous enzymatic hydrolysis of fresh (never-frozen) salmon heads and bones at the processing plant, yielding three zero-waste products — purified fish oil OmeGo, soluble protein hydrolysate ProGo and joint calcium powder CalGo.
• EFSA Novel Food and Copalis: EFSA runs multi-year safety testing of bioactive marine peptides before clearing them as Novel Foods, checking allergenic potential and molecular-profile stability, while Copalis (France) supplies specialized wild-fish hydrolysates (Alphamine, Collactive) as a B2B ingredient partner.

05Leading companies and research institutes

06Tech stack and innovations

Blue-nutraceutical production rests on tangential-flow membrane cascades, industrial spray-drying and supercritical-CO2 extraction that protect fragile omega-3 double bonds from oxidation.

1. Cascaded tangential ultrafiltration (TFF Membrane Filtration):
   • the liquid hydrolysate is pumped at high pressure parallel to polyethersulfone hollow-fibre membranes, holding transmembrane pressure to split retentate (large proteins sent back for re-hydrolysis) from a permeate of collagen peptides strictly under 2 kDa.
2. Industrial spray dryers (Spray Drying):
   • the peptide concentrate is atomized as a fine mist into a chamber of sterile air heated to 180 °C; water flashes off instantly and dry spherical peptide microgranules settle in the cyclone, with evaporative cooling preventing thermal damage and caramelization of the amino acids.
3. Supercritical-CO2 extraction (Supercritical Fluid Extraction):
   • fish-liver oil is fed into an extraction column where supercritical carbon dioxide (about 31 °C, 300 bar) is the solvent, recovering delicate omega-3 lipids without toxic organic solvents or heat and fully protecting the double bonds from oxidation.

07Value chains and production pipelines

Industrial pipeline of high-purity bioactive collagen peptides from cod skin by continuous enzymatic hydrolysis and spray-drying (ISO 22000 / GMP)

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Mincing and washing    │ ───> │ 2. Acid-alkaline          │
│    cod skin               │      │    demineralization       │
└───────────────────────────┘      └───────────────────────────┘
                                                  │
                                                  ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Membrane separation    │ <─── │ 3. Enzymatic hydrolysis   │
│    (UF/NF)                │      │    (proteases)            │
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. Spray drying and       │ ───> │ 6. Packing and peptide    │
│    granulation            │      │    MW quality control     │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Feedstock preparation and mechanical cleaning of cod skin

Frozen blocks of Atlantic cod (Gadus morhua) skin are defrosted at 4 °C over 12 hours, washed in ice-cold deionized water to remove residual scales, mucus and salt, and minced through a 5 mm grate to maximize the contact area for reagents.

Stage 2: Acid-alkaline conditioning and demineralization

The mince is pumped into a jacketed reactor and treated with 0.1 M sodium hydroxide at 6 °C for 4 hours to remove non-collagen proteins, lipids and pigments, then washed to neutral pH; a weak 0.05 M hydrochloric-acid step softens the structure and removes calcium salts, and the swollen collagen mass is washed with ice water to pH 6.5.

Stage 3: Precision enzymatic hydrolysis

Deionized water is added to the demineralized mass at 1:2, the reactor is heated to 55 °C and the pH is held at 8.0 by automatic alkali dosing; an industrial protease (Alcalase 2.4L at 0.8% of dry protein mass) is dosed in and hydrolysis runs under continuous mixing for 3 hours, cleaving collagen fibrils into short peptide chains before the reaction is arrested by flash-heating to 85 °C for 15 minutes.

Stage 4: Selective membrane fractionation

The hot mix is cooled to 45 °C and fed to a tricanter centrifuge to remove large insoluble scale particles and freed oil; the clarified hydrolysate passes through an activated-carbon filter to strip yellow pigment and fish odour, and a tangential-flow ultrafiltration unit with a 2 kDa cut-off collects the low-molecular-weight collagen peptide permeate while retentate returns to the hydrolysis reactor.

Stage 5: High-temperature spray drying

The peptide permeate is vacuum-concentrated to 35% dry solids, flash-pasteurized at 120 °C for 4 seconds, and atomized under 180 bar into a spray dryer with 180 °C inlet and 85 °C outlet air; the dry white powder settles in the cyclone, is cooled by dry cold air and conveyed to packing.

Stage 6: Packing, quality certification and laboratory QC

The marine collagen powder is sieved to remove agglomerates; QC samples each batch for molecular-weight distribution by HPLC (strictly >90% of peptides under 2 kDa), moisture (<5%), solubility, absence of heavy metals (arsenic, mercury, lead) by ICP-MS, and microbiological purity (no salmonella, no coliforms) before vacuum or nitrogen packing in three-layer kraft bags with a polyethylene liner for B2B shipment.