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<p>The commercial harvesting of macroalgae from wild populations is conducted across several global regions. However, this can lead to significant delays between harvest, dewatering/drying and further processing, presenting issues in maintaining product stability. This study investigated changes in biomolecules and bacterial loading of four commercially valuable species (<i>Ascophyllum nodosum, Laminaria digitata</i>, <i>Chondrus crispus</i> and <i>Ulva</i> sp.) during pre-drying storage at intervals of up to four weeks from two seasons, emulating industrial conditions. Prior to experimental treatments, species reflected natural levels in chemical compounds corresponding with previously reported values. Throughout the experimental periods, substantial and rapid increases in surface bacteria were observed in all macroalgal biomass. All species except <i>A. nodosum</i> exhibited significant changes in total fatty acids, particularly reductions in valuable omega-3 fatty acids. Highest omega-3 levels were observed in fresh <i>C. crispus</i> in summer, and in <i>Ulva</i> sp. in winter. During the degradation period, <i>C. crispus</i> exhibited the greatest reduction in omega-3. Across all biomass, total pigment levels were highest in freshly harvested <i>Ulva</i> sp. in winter. Significant pigment reductions occurred in all species after two and four weeks in summer. In winter, levels remained relatively stable in <i>A. nodosum</i> and <i>Ulva</i> sp.. Total phenolic contents in <i>A. nodosum</i> increased post-harvest and then remained relatively stable for two weeks. Overall, results highlight that careful consideration should be given to biomass selection, storage and processing methodologies to retain desirable compound profiles and associated bioactivity. The importance of prompt treatment of biomass to minimize loss of valuable biomolecules should not be underestimated.</p>

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Changes in high-value biomolecule profiles and bacterial loads during experimental storage of four industry-relevant macroalgal species

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Keelan C. Lawlor,
  • Dilip K. Rai,
  • Dagmar B. Stengel

摘要

The commercial harvesting of macroalgae from wild populations is conducted across several global regions. However, this can lead to significant delays between harvest, dewatering/drying and further processing, presenting issues in maintaining product stability. This study investigated changes in biomolecules and bacterial loading of four commercially valuable species (Ascophyllum nodosum, Laminaria digitata, Chondrus crispus and Ulva sp.) during pre-drying storage at intervals of up to four weeks from two seasons, emulating industrial conditions. Prior to experimental treatments, species reflected natural levels in chemical compounds corresponding with previously reported values. Throughout the experimental periods, substantial and rapid increases in surface bacteria were observed in all macroalgal biomass. All species except A. nodosum exhibited significant changes in total fatty acids, particularly reductions in valuable omega-3 fatty acids. Highest omega-3 levels were observed in fresh C. crispus in summer, and in Ulva sp. in winter. During the degradation period, C. crispus exhibited the greatest reduction in omega-3. Across all biomass, total pigment levels were highest in freshly harvested Ulva sp. in winter. Significant pigment reductions occurred in all species after two and four weeks in summer. In winter, levels remained relatively stable in A. nodosum and Ulva sp.. Total phenolic contents in A. nodosum increased post-harvest and then remained relatively stable for two weeks. Overall, results highlight that careful consideration should be given to biomass selection, storage and processing methodologies to retain desirable compound profiles and associated bioactivity. The importance of prompt treatment of biomass to minimize loss of valuable biomolecules should not be underestimated.