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Low-temperature water blanching (LTB; 40\u00a0\u00b0C for 5\u00a0min) had minor impacts on macroalgal chemical composition and <jats:italic>in vitro<\/jats:italic> digestibility. Conversely, high-temperature water blanching (HTB; 80\u00a0\u00b0C for 5\u00a0min) effectively reduced total ash and specific elements, including sodium, potassium, iodine, and arsenic, by\u2009~\u200925\u201373% compared to unblanched algal biomass (more prominently in FV). The HTB raised total sugar contents by\u2009~\u200925% in FV, markedly elevating uronic acids (~\u200960%) and glucans (~\u200933%). However, HTB reduced mannitol (&gt;\u200950%) and enhanced total polyphenol extractability in both macroalgae. The HTB diminished\u2009~\u20098% of <jats:italic>in vitro<\/jats:italic> dry matter or organic matter digestibility and 26% of crude protein (CP) digestibility of both macroalgae for monogastric animals and of FV for ruminants (particularly of CP by\u2009~\u200942%). Those reduced digestibilities were associated with enriched fibre, uronic acids, total polyphenols, and declined mannitol in the HT-blanched macroalgal biomass. Our findings suggest that hot-water blanching can be an efficient technique to optimise the elemental composition of two fucoid algae, but the altered sugar and complex\u00a0carbohydrate compositions may impair their digestibility. Future studies should identify appropriate post-harvest processing techniques for brown macroalgae that can optimise both nutritional composition and digestibility along with favourable impacts on feed utilisation and animal performance.<\/jats:p>","DOI":"10.1007\/s10811-023-03044-6","type":"journal-article","created":{"date-parts":[[2023,8,9]],"date-time":"2023-08-09T14:02:26Z","timestamp":1691589746000},"page":"2511-2529","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Differential impacts of post-harvest hydrothermal treatments on chemical composition and in vitro digestibility of two brown macroalgae (Fucales, Phaeophyceae), Ascophyllum nodosum and Fucus vesiculosus, for animal feed applications"],"prefix":"10.1007","volume":"35","author":[{"given":"Deepak","family":"Pandey","sequence":"first","affiliation":[]},{"given":"Geir","family":"N\u00e6ss","sequence":"additional","affiliation":[]},{"given":"Ant\u00f3nio J. 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