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Proton transfer reaction‐time‐of‐flight‐mass spectrometry (PTR‐ToF‐MS or PTR‐MS) is an analytical chemistry technique that can be used for measuring the concentration of volatile organic compounds directly in the subjects' noses (nosespace, in vivo analysis) during a tasting and over time. It can be combined with temporal sensory methods such as temporal dominance of sensations (TDS) or temporal check...