Sensory testing to determine odor thresholds has produced very variable values (literature values can vary by two to three orders of magnitude). Some of this variation is due to interperson genetic and physiological differences, but variation in odor delivery during such tests is also likely to have a significant impact. Olfactometers deliver odor reliably, but are relatively expensive and usually deliver to a single panelist, making testing of the full panel time-consuming. Simpler ways of delivering odors were tested using online APCI-MS to determine the variability in the delivered odor concentration over periods of time associated with sensory panel testing.

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