{"id":1435,"date":"2026-09-20T20:42:05","date_gmt":"2026-09-20T12:42:05","guid":{"rendered":"https:\/\/www.jingfenggroup.com\/blogs\/brown-seaweed-extract-production-process\/"},"modified":"2026-09-20T20:42:06","modified_gmt":"2026-09-20T12:42:06","slug":"brown-seaweed-extract-production-process","status":"publish","type":"post","link":"https:\/\/www.jingfenggroup.com\/zh\/blogs\/seaweed-extract\/brown-seaweed-extract-production-process\/","title":{"rendered":"Brown seaweed extract production process"},"content":{"rendered":"
\"Brown<\/figure>\n

Overview of Brown Seaweed Extract Production<\/h2>\n

Brown seaweeds (Phaeophyceae), such as Ascophyllum nodosum<\/em>, Laminaria digitata<\/em>, Saccharina latissima<\/em>, and Sargassum wightii<\/em>, are rich in bioactive compounds like alginates, fucoidans, laminarin, and phlorotannins. These are extracted for applications in food, pharmaceuticals, cosmetics, agriculture (e.g., biostimulants), and biofuels. The production process typically involves wild harvesting or aquaculture, followed by pre-treatment and extraction. Global production of seaweed hydrocolloids from brown algae is around 55,000 tonnes annually, valued at over US$585 million, with alginate being the primary extract (US$213 million). Cultivation is limited for industrial extraction due to high costs, so most raw material comes from wild sources in cold waters (up to 20\u00b0C).<\/p>\n

The process varies by target compound but follows a general workflow: harvesting, pre-treatment, extraction, purification, and drying. Below, I’ll outline the standard industrial process, with specifics for key extracts.<\/p>\n

General Production Process Steps<\/h2>\n

The process is often a biorefinery approach, maximizing yields by sequential extraction of multiple compounds. Here’s a step-by-step breakdown:<\/p>\n\n\n\n\n\n\n\n\n
Step<\/td>\nDescription<\/td>\nKey Methods\/Tools<\/td>\nNotes<\/td>\n<\/tr>\n
1. Harvesting<\/td>\nCollection of mature seaweed from wild beds (e.g., coasts of Scotland, Ireland, Norway) or farms. Species like A. nodosum yield ~30,000 wet tonnes\/year globally.<\/td>\nMechanical cutting, hand-harvesting, or aquaculture (e.g., ropes for L. digitata). Sustainable quotas prevent overexploitation.<\/td>\nFocus on clean, unpolluted waters; seasonal (e.g., winter for higher alginate content). Wet weight: ~1 million tonnes harvested annually for extracts.<\/td>\n<\/tr>\n
2. Pre-treatment<\/td>\nCleaning to remove sand, salt, and epiphytes; then washing, milling\/chopping, and drying to 10-15% moisture.<\/td>\nWashing with seawater\/freshwater; drying via sun, hot air, or freeze-drying; grinding to 1-5 mm particles.<\/td>\nReduces impurities and facilitates extraction; energy-intensive but essential for storage\/transport.<\/td>\n<\/tr>\n
3. Extraction<\/td>\nSolvent-based release of target compounds. Alkaline for alginates; acid\/water for fucoidan\/laminarin.<\/td>\n– Alkaline (Na\u2082CO\u2083, 1.5-7.5%, 60-90\u00b0C, 1-3 hours). – Acid (HCl 0.1-5%, pH 2-2.5, 70\u00b0C). – Advanced: Microwave-assisted (MAE) or heat\/pressure percolation for faster yields.<\/td>\nYields: Alginate 20-40% dry weight; fucoidan 5-10%. MAE reduces time\/solvent by 50-80%.<\/td>\n<\/tr>\n
4. Separation & Purification<\/td>\nFiltration\/centrifugation to isolate crude extract; precipitation and chromatography for purity.<\/td>\nFiltration; ethanol\/acetone precipitation; ion-exchange or size-exclusion chromatography.<\/td>\nRemoves residuals (e.g., cellulose); achieves 95% purity for pharmaceuticals. By-products (e.g., proteins) can be valorized.<\/td>\n<\/tr>\n
5. Concentration & Drying<\/td>\nEvaporation and final drying to powder\/granules.<\/td>\nSpray-drying or freeze-drying; milling to mesh size (e.g., 40 for high-purity).<\/td>\nFinal product: Soluble powders for food\/feed; yields ~7-37% for combined extracts.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Specific Processes for Key Extracts<\/h2>\n