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<p><i>Rugulopteryx okamurae</i>, an invasive brown alga native from Eastern Asia, has rapidly extended along the European Mediterranean coast and Northern Africa, causing severe ecological and economic impacts. Various strategies for the containment and management of the invasion of this species have emerged, including its utilization as a raw material for the production of valuable products, promoting a circular economy. Thus the objective of this study was to quantify the bioactive compounds (BACs) present in <i>R. okamurae</i>&#xa0;using various spectrophotometric and chromatographic techniques. To achieve this, two drying methods (air-dried and freeze-dried) and three extraction techniques (solvent maceration (depending on assay (methanol, distilled water, or phosphate buffer), enzymatic hydrolysis (‘Sputnik’ cocktail at 15, 30, 46 and 60&#xa0;mg g<sup>−1</sup>; with and without ultrasound treatment), and alkaline hydrolysis (using sodium carbonate (SC) at 45 and 80&#xa0;°C)) were applied. The quantity of antioxidant compounds (sulphated carbohydrates, polyphenolics), and antioxidant capacity, excluding proteins, extracted in water, showed no significant differences in the drying method and reached higher values after alkaline hydrolysis, compared to ambient temperature mechanical extraction. Lipids and fucoidans content were unaffected by the drying method and were higher with mechanical maceration. Polar pigments, being more labile, were better extracted after freeze-drying and maceration. The extraction yield increased with enzymatic hydrolysis (20 to 168% depending on the BACs). The results indicate that, depending on the specific compound to be assessed, it is advisable to follow a particular drying and extraction strategy. Moreover, data from air-dried algae indicates that the biomass collected from beach-cast or floating algae could be very useful for obtaining BACs, demonstrating the potential use of this invasive algae.</p>

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Biochemical composition of the invasive exotic brown alga Rugulopteryx okamurae: a comparison of methods for extracting the bioactive compounds

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Jaime Lanzas,
  • Débora Tomazi Pereira,
  • Paz García-García,
  • Julia Vega,
  • Marta Díez,
  • Francisco Javier Señoráns,
  • Nathalie Korbee,
  • Félix L. Figueroa

摘要

Rugulopteryx okamurae, an invasive brown alga native from Eastern Asia, has rapidly extended along the European Mediterranean coast and Northern Africa, causing severe ecological and economic impacts. Various strategies for the containment and management of the invasion of this species have emerged, including its utilization as a raw material for the production of valuable products, promoting a circular economy. Thus the objective of this study was to quantify the bioactive compounds (BACs) present in R. okamurae using various spectrophotometric and chromatographic techniques. To achieve this, two drying methods (air-dried and freeze-dried) and three extraction techniques (solvent maceration (depending on assay (methanol, distilled water, or phosphate buffer), enzymatic hydrolysis (‘Sputnik’ cocktail at 15, 30, 46 and 60 mg g−1; with and without ultrasound treatment), and alkaline hydrolysis (using sodium carbonate (SC) at 45 and 80 °C)) were applied. The quantity of antioxidant compounds (sulphated carbohydrates, polyphenolics), and antioxidant capacity, excluding proteins, extracted in water, showed no significant differences in the drying method and reached higher values after alkaline hydrolysis, compared to ambient temperature mechanical extraction. Lipids and fucoidans content were unaffected by the drying method and were higher with mechanical maceration. Polar pigments, being more labile, were better extracted after freeze-drying and maceration. The extraction yield increased with enzymatic hydrolysis (20 to 168% depending on the BACs). The results indicate that, depending on the specific compound to be assessed, it is advisable to follow a particular drying and extraction strategy. Moreover, data from air-dried algae indicates that the biomass collected from beach-cast or floating algae could be very useful for obtaining BACs, demonstrating the potential use of this invasive algae.