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.