ArticleBioresources and bioprocessing2026
Integrated sustainable valorization of seaweed (Ulva ohnoi) biomass into food-grade ingredients with year-round cultivated feedstock.
Article in Bioresources and bioprocessing, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Via efficient, scalable, and climate resilient processes, seaweed biorefineries can advance cleaner production, delivering nutrient-rich ingredients with relatively lower land and freshwater requirements. Here, a land-based Ulva ohnoi platform that integrates optimized outdoor tank cultivation, pH-shift protein extraction with dual-product valorization, scale-aware techno-economic analysis (TEA), and a climate-scenario emulator was developed and evaluated. Year-round cultivation yielded a pooled feedstock with carbohydrate and protein contents at 46.6% and 26.8%, respectively, and under optimal conditions, protein yield was 10.30% DW. Further, the protein content of cultivated Ulva protein (CUP) was 47.64%, with bound amino acids showing predominance (96%), implying food-grade utility. pH-shift extraction also improved in-vitro pepsin digestibility to 68.08%. The total dietary fiber content of CUP residue (CUPR) was 40.59%, with insoluble dietary fiber (31.59%) showing predominance, supporting the applicability of CUPR in improving gastrointestinal tract function. TEA revealed strong economies of scale for the platform. The 10,000-kg production model outperformed the 100- and 1,000-kg production models, with gross margin, Return On Investment (ROI), and Internal Rate of Return (IRR) at 78.56%, 110%, and 66.02%, respectively, and a payback time of only 0.91 years. Based on site-specific regression analysis (R2 = 0.884), protein yield increased with temperature but decreased with rainfall, and further warming increased mean protein yield, while higher-emission pathways introduced rainfall-driven volatility, necessitating strategies for sustaining performance under climate variability. Overall, the use of the Ulva platform showed a broad growth temperature window as well as rapid acclimation for U. ohnoi, implying resilience even under global warming conditions and increasing weather variability.
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