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Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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SOLID3: a multiplex antibody microarray-based optical sensor instrument for in situ life detection in planetary

Víctor Parro1, Graciela de Diego-Castilla, José A Rodríguez-Manfredi

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The Signs Of LIfe Detector (SOLID3) instrument uses protein microarray technology for in situ detection of extraterrestrial biomolecules. It successfully identified microorganisms in a Mars analogue, even with high perchlorate levels.

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Area of Science:

  • Astrobiology and planetary science.
  • Development of novel biosignature detection technologies.
  • Biomarker analysis in extreme environments.

Background:

  • Detecting extraterrestrial life is a key astrobiological challenge.
  • Previous Mars missions failed to detect organic molecules due to sample heating and soil chemistry.
  • New methods are needed for in situ detection of life's signs.

Purpose of the Study:

  • To present the SOLID3 instrument for automatic in situ detection and identification of analytes.
  • To demonstrate the capabilities of SOLID3 for detecting a wide range of biomolecules and microorganisms.
  • To assess SOLID3's performance in a Mars analogue environment with relevant chemical conditions.

Main Methods:

  • Development of the SOLID (Signs Of LIfe Detector) instrument based on protein microarray technology.
  • SOLID3 comprises a Sample Preparation Unit (SPU) for extraction and a Sample Analysis Unit (SAU) for fluorescent immunoassays.
  • Utilized sandwich and competitive immunoassays with antibody microarrays and a CCD-based optical detection system.

Main Results:

  • Demonstrated detection of peptides, proteins, whole cells, and spores with high sensitivity (1-2 ppb for biomolecules, 10³-10⁴ spores/mL).
  • Successfully detected acidophilic microorganisms in the Río Tinto Mars analogue.
  • Showed no significant negative impact on immunoassays in the presence of 50 mM perchlorate.

Conclusions:

  • The SOLID instrument concept is effective for detecting biomolecules, avoiding destructive high-temperature treatments.
  • SOLID3 offers a robust platform for in situ astrobiological sample analysis.
  • The technology is suitable for detecting potential biosignatures in challenging extraterrestrial environments like Mars.