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<p>In the present study, the biodegradation of Low-Density Polyethylene microplastics was investigated using <i>Porphyridium purpureum</i> microalgae, with a focus on evaluating the effects of microplastic concentration, particle size, and shaking speed. The study was conducted in two phases: first, optimizing the cultivation conditions for <i>Porphyridium purpureum</i>, followed by assessing its ability to remove Low-Density Polyethylene. The highest microalgae yield was achieved under optimal conditions, which included a light intensity of 2500 µmol photons m⁻² s⁻¹, F/2 culture medium, and a temperature of 30&#xa0;°C. These conditions were established as the baseline for the Low-Density Polyethylene removal phase. The results demonstrated that the maximum Low-Density Polyethylene removal efficiency achieved was 34.24%. Fourier Transform Infrared Spectroscopy analysis demonstrated a reduction in the intensity of the carbonyl functional group, likely due to the release of carbon from the microplastic structure, thereby indicating an effective interaction between microalgae and Low-Density Polyethylene. Furthermore, Scanning Electron Microscopy images revealed significant surface modifications, including small holes and corrosion on the Low-Density Polyethylene particles, providing strong evidence of the degradation process facilitated by <i>Porphyridium purpureum</i>. These findings suggest that the microalgae have the potential to degrade Low-Density Polyethylene microplastics, offering valuable insights into their use for bioremediation of microplastic pollution.</p>

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Bioremediation of low-density polyethylene microplastics using red microalga porphyridium purpureum: a biotechnological perspective

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月18日

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  • Hesam Sharif,
  • Roya Mafigholami,
  • Omid Tavakoli,
  • Hamid Moghimi

摘要

In the present study, the biodegradation of Low-Density Polyethylene microplastics was investigated using Porphyridium purpureum microalgae, with a focus on evaluating the effects of microplastic concentration, particle size, and shaking speed. The study was conducted in two phases: first, optimizing the cultivation conditions for Porphyridium purpureum, followed by assessing its ability to remove Low-Density Polyethylene. The highest microalgae yield was achieved under optimal conditions, which included a light intensity of 2500 µmol photons m⁻² s⁻¹, F/2 culture medium, and a temperature of 30 °C. These conditions were established as the baseline for the Low-Density Polyethylene removal phase. The results demonstrated that the maximum Low-Density Polyethylene removal efficiency achieved was 34.24%. Fourier Transform Infrared Spectroscopy analysis demonstrated a reduction in the intensity of the carbonyl functional group, likely due to the release of carbon from the microplastic structure, thereby indicating an effective interaction between microalgae and Low-Density Polyethylene. Furthermore, Scanning Electron Microscopy images revealed significant surface modifications, including small holes and corrosion on the Low-Density Polyethylene particles, providing strong evidence of the degradation process facilitated by Porphyridium purpureum. These findings suggest that the microalgae have the potential to degrade Low-Density Polyethylene microplastics, offering valuable insights into their use for bioremediation of microplastic pollution.