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Two thirds of the word are covered by oceans and a vast majority of that upper layer are inhabited by photoautotrophic organisms such as algae. Algae are not only of high ecological, but also of great economic importance. The industrial exploitation of algae has suffered a boom in the last two decades, revealing a source of compounds relevant to a diverse range of sectors (agriculture, energy, food science, cosmeceutical, pharmacology, etc). In consequence, many possible applications have emerged, such as production of biofuels for energy production, as nutraceutical ingredients in fish meals, as fertilizer in landfill applications, anti-biofilm activity in food science, incorporation in cosmeceutical and pharmacological products due to the rich content in bioactive compounds, among others [1]. In this work, high hydrostatic pressure (HHP) was applied to the extraction of phenolic compounds from eight edible algae species (Table 1). The process was optimized by response surface methodology using a five-level central composite design combining the independent variables of processing time (t, 5-90 min), pressure (P, 10-600 MPa) and solvent (S, 0-100 % of ethanol, v/v) [2]. The individual and grouped phenolic compounds were analysed, and the extraction yield were used as response variables. The theoretical models were fitted to the experimental data, statistically validated, and used in the prediction and optimization steps. In general, the optimum extraction conditions for phenolic acids for all eight species analysed were found at shorter values of t, high values of P and high values of S. The identified phenolic compounds were also clustered …