Odor intensity evaluation in gas chromatography-olfactometry by finger span method.

Area of Science:

• Analytical Chemistry
• Sensory Science
• Psychophysics

Background:

• Traditional methods for odor intensity evaluation can be subjective.
• Gas chromatography-olfactometry (GC-O) is a powerful tool for analyzing volatile compounds.
• Developing objective and precise methods for sensory analysis is crucial in food and fragrance industries.

Purpose of the Study:

• To introduce and validate a novel method for quantifying odor intensity using cross-modality matching with finger span (GC-O-FSM).
• To establish the reliability and precision of the GC-O-FSM technique for sensory analysis.
• To explore the correlation between physical measurements and perceived odor intensity.

Main Methods:

• Development of a prototype device for measuring finger span distance during olfactory analysis.
• Stimulation of panelists with ethyl butyrate at the sniffing port of a gas chromatograph.
• Log-log analysis of the relationship between finger span measurements and stimulus concentrations.
• Triplicate evaluation of flavor constituents in synthetic solutions using a four-member panel.

Main Results:

• A log-log relationship was observed between finger span peak height and ethyl butyrate concentrations.
• Panelists demonstrated consistent ability to perform the task, with precision used for selection.
• A four-member panel successfully characterized synthetic solutions and created a finger span multidimensional space.
• The generated finger span space showed high correlation with the theoretical intensity space.

Conclusions:

• Gas chromatography-olfactometry-finger span cross-modality matching (GC-O-FSM) is a viable and precise method for evaluating odor intensities.
• The technique allows for objective quantification of sensory perception, correlating physical measurements with perceived intensity.
• GC-O-FSM offers a promising approach for sensory analysis, particularly in characterizing complex flavor profiles.