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Odor Sampling Bags Enable Reliable Delivery of Controlled Odor Concentrations
Matthew Andres1, Robert Pellegrino1, Xuebo Song1
1Monell Chemical Senses Center, Philadelphia, PA, USA.
Biorxiv : the Preprint Server for Biology
|February 6, 2026
Summary
A new Nalophan plastic odor sampling bag system offers improved stimulus control for olfactory research by eliminating solvent variability and air dilution. This cost-effective method enhances odorant concentration consistency and test-retest reliability compared to traditional glass jars.
Area of Science:
- Olfactory research
- Sensory science
- Psychophysics
Background:
- Precise control of odorant concentration is crucial for reliable olfactory research.
- Existing odorant delivery methods face challenges with solvent interactions and ambient air dilution, impacting stimulus consistency.
Purpose of the Study:
- To develop and evaluate a novel odor sampling bag system using Nalophan plastic.
- To assess the system's effectiveness in controlling odorant concentration and improving stimulus consistency compared to glass jars.
Main Methods:
- Development of a closed headspace odor sampling bag system with air as the carrier medium.
- Two experiments involving 15 trained panelists rating perceived intensity of benzaldehyde and 2-heptanone at seven concentrations using both bags and glass jars.
- Photoionization detector measurements to confirm headspace concentration stability over time.
Main Results:
- Odor sampling bags yielded higher maximum perceptual intensities and superior test-retest reliability compared to glass jars.
- Bags preserved odorant-specific concentration differences, unlike jars.
- Headspace concentrations in bags remained stable over time, comparable to industry-standard Tedlar bags.
Conclusions:
- The Nalophan plastic odor sampling bag system provides a cost-effective solution for enhanced stimulus control in olfactory research.
- This method mitigates solvent variability and ambient air dilution, leading to more reliable and reproducible olfactory psychophysical studies.
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