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<p>The design and application of a composite sensor for monitoring bacterial peroxide originating from <i>Lactobacillus johnsonii</i> DSM 10533 is described. The sensor format is based on the co-deposition of Prussian blue and chitosan onto a laser-induced graphene substrate to yield a highly sensitive system capable of monitoring peroxide with bacterial culture over the range 20 µM to 1 mM with a sensitivity of 122 mA/mM and detection limit of 30 mM. Amperometric detection of H<sub>2</sub>O<sub>2</sub> at − 0.036 V vs Ag/AgCl was achieved allowing selectivity in complex media. The miniature nature of the sensor enabled a detection volume of 200 µL and gave a response in 20 s, and the samples required no dilution or reagent addition. The ability to rapidly prototype LIG-PB-CS integrated electrode assemblies provides a facile route for the production of sensors capable of monitoring lactobacilli interactions at small scales and within batch-level fermentation reactors.</p>

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Development of a composite graphene-Prussian blue-chitosan sensor for monitoring peroxide within Lactobacillus johnsonii DSM 10533 cultures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月14日

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  • Robert Barber,
  • Taylor S. Cunning,
  • Victoria Gilpin,
  • Martin McBride,
  • Nigel G. Ternan,
  • William J. Snelling,
  • Pagona Papakonstantinou,
  • James Davis

摘要

The design and application of a composite sensor for monitoring bacterial peroxide originating from Lactobacillus johnsonii DSM 10533 is described. The sensor format is based on the co-deposition of Prussian blue and chitosan onto a laser-induced graphene substrate to yield a highly sensitive system capable of monitoring peroxide with bacterial culture over the range 20 µM to 1 mM with a sensitivity of 122 mA/mM and detection limit of 30 mM. Amperometric detection of H2O2 at − 0.036 V vs Ag/AgCl was achieved allowing selectivity in complex media. The miniature nature of the sensor enabled a detection volume of 200 µL and gave a response in 20 s, and the samples required no dilution or reagent addition. The ability to rapidly prototype LIG-PB-CS integrated electrode assemblies provides a facile route for the production of sensors capable of monitoring lactobacilli interactions at small scales and within batch-level fermentation reactors.