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<p><i>Pyropia columbina</i> is a red seaweed known to have antioxidant activity, a well balanced amino acid profile and the presence of agars and carragenans that have gelling and emulsifying properties. The aim of the study was to optimize antioxidants recovery from <i>P. columbina</i> trough Pressurized Liquid Extraction (PLE), identify its pigments and develop a stable emulsion with the PLE residue. Pressurized liquid extraction for 41 min at 100 bar was performed, changing temperature and ethanol-water proportion according to a face-centered central composite design. The use of response surface methodology allowed the definition of optimal conditions considering total phenols content (TPC) (Folin-Ciocalteu method) and antioxidant activity (ABTS assay). After drying the extracts, chlorophyll and carotenoids content was assessed (HPLC). Post extraction residue was tested as an emulsifier and stabilizer in an oil-in-water emulsion. Its color, pH, microscopy drop distribution and backscattering profile after a three-month storage were characterized. The results established an optimized TPC and antioxidant activity extraction with 83.5 % ethanol and 140 °C (19.7 mg GAE g<sup>-1</sup> and 139.8 µmol TE g<sup>-1</sup>). PLE allowed the recovery of carotenes and xanthophylls, and its residue can be use in the development of a plant-based emulsion that showed high stability throughout three months of storage. These findings highlight the value of PLE as an efficient method to harness natural bioactive compounds from <i>P. columbina</i> and offer the possibility of using the residue to develop valuable food products that align with waste valorization strategies and circular bioeconomy approaches to enhance human health.</p>

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Integrated valorization of Pyropia columbina: Optimization of pressurized liquid extraction of natural antioxidants and functional use of residues as natural emulsifiers

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Melisa Fushimi,
  • Cecilia Dauber,
  • Carla Bonifacino,
  • Eugenia Vila,
  • Camila Rodriguez,
  • Cecilia Abirached,
  • Patricia Raquel Quiroga,
  • Ignacio Vieitez

摘要

Pyropia columbina is a red seaweed known to have antioxidant activity, a well balanced amino acid profile and the presence of agars and carragenans that have gelling and emulsifying properties. The aim of the study was to optimize antioxidants recovery from P. columbina trough Pressurized Liquid Extraction (PLE), identify its pigments and develop a stable emulsion with the PLE residue. Pressurized liquid extraction for 41 min at 100 bar was performed, changing temperature and ethanol-water proportion according to a face-centered central composite design. The use of response surface methodology allowed the definition of optimal conditions considering total phenols content (TPC) (Folin-Ciocalteu method) and antioxidant activity (ABTS assay). After drying the extracts, chlorophyll and carotenoids content was assessed (HPLC). Post extraction residue was tested as an emulsifier and stabilizer in an oil-in-water emulsion. Its color, pH, microscopy drop distribution and backscattering profile after a three-month storage were characterized. The results established an optimized TPC and antioxidant activity extraction with 83.5 % ethanol and 140 °C (19.7 mg GAE g-1 and 139.8 µmol TE g-1). PLE allowed the recovery of carotenes and xanthophylls, and its residue can be use in the development of a plant-based emulsion that showed high stability throughout three months of storage. These findings highlight the value of PLE as an efficient method to harness natural bioactive compounds from P. columbina and offer the possibility of using the residue to develop valuable food products that align with waste valorization strategies and circular bioeconomy approaches to enhance human health.