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Related Concept Videos

Olfaction01:25

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Related Experiment Video

Updated: Jan 19, 2026

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
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Chemical vapor detection using a reconstituted insect olfactory receptor complex.

Koji Sato1, Shoji Takeuchi

  • 1Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo (Japan); ERATO Takeuchi Biohybrid Innovation Project, JST, Komaba Open Laboratory, 4-6-1 Komaba, Meguro-ku, Tokyo (Japan).

Angewandte Chemie (International Ed. in English)
|July 30, 2014
PubMed
Summary

Researchers developed a bioinspired electrophysiology method to study olfactory receptors (ORs) and chemical vapors. This technique successfully recorded OR responses, revealing differences in ligand binding compared to in vivo studies for mosquito ORs.

Keywords:
biosensorsion channelsolfactionreceptors

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Area of Science:

  • Biophysics
  • Neuroscience
  • Chemical Sensing

Background:

  • Vapor odorant sensing is crucial in life and medical sciences.
  • Olfactory receptors (ORs) can recognize volatile organic compounds, but their interactions with chemical vapors and mucus peptides are not fully understood for sensor development.
  • Existing methods lack detailed analysis of OR-chemical vapor-mucus peptide interactions.

Purpose of the Study:

  • To develop a bioinspired electrophysiology technique to analyze the interaction between olfactory receptors (ORs) and chemical vapors.
  • To mimic the olfactory mucus interface for studying OR responses.
  • To investigate the ligand repertoire of mosquito ORs.

Main Methods:

  • A bioinspired electrophysiology technique was employed.
  • Reconstituted insect ORs were expressed in spheroids and loaded into hydrogel microchamber arrays to mimic the OR-olfactory mucus interface.
  • Extracellular field potentials were recorded upon stimulation with vapor cognate ligands.

Main Results:

  • A negative extracellular field potential shift was successfully observed in OR-expressing spheroids upon stimulation with their cognate ligands.
  • The ligand repertoire of the malaria vector mosquito OR, examined using this method, showed differences compared to in vivo studies.
  • The technique effectively recorded responses of reconstituted insect ORs to chemical vapors.

Conclusions:

  • The developed bioinspired electrophysiology method is effective for studying OR-chemical vapor interactions.
  • This technique provides a novel approach for developing protein-based gas sensing technologies.
  • The findings highlight potential discrepancies between in vitro and in vivo OR ligand binding profiles.