Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 838, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156394
Keywords
S; latissima; A; nodosum; Antioxidant activity; Fucoidan; Waste valorization; Circular economy
Categories
Funding
- Spanish Research agency (Ministry of Science and Innovation) [RTI-2018-094268-B-C22, PID2020-117744RJ-I00]
- Generalitat Valenciana [GRISOLIAP/2019/007]
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The study characterized the waste streams of the alginate industry in Europe, revealing their high potential as bioactive and nutritional added-value ingredients for cosmetic, food, feed, or pharmaceutical applications.
The alginate industry processes more than hundred thousand tons per year of algae in Europe, discarding around 80% of the algae biomass as different solid/liquid residual streams. In this work, Saccharina latissima and Ascophyllum nodosum, their generated alginates and all residual fractions generated in the process were characterized in terms of lipid, ash, protein content, and the carbohydrate composition and antioxidant capacities analyzed. The first fraction after acid treatment (ca. 50% of the initial dry biomass) was rich in phlorotannins (15 mg GAE/g) and bioactive fucoidans (15-70%), with a high sulfation degree in A. nodosum. Two fractions generated from the solid residue, one soluble and another insoluble (Ra and Rb, respectively), constituted 9% and 5-8% of the initial biomass and showed great potential as a source of soluble protein (30% for S. latissima), and cellulose (70%) or fucoidan, respec-tively. Valorization strategies are suggested for these waste streams, evidencing their high potential as bioactive, tex-turizing or nutritional added-value ingredients for cosmetic, food, feed or pharmaceutical applications.
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