Effect of Temperature and Density on Evaluation of Lemon Aroma

Abstract

This paper investigates effects of temperature and density of lemon aroma on a subjective evaluation. We used the semantic differential (SD) method in the evaluation test with the following 5 words; clean, thick, refreshing, relaxing, and favorite-and their antonyms. We made a total of 12 aromatic gases (4 amounts of lemon essential oil (0.5, 1, 5, and 10 mg in a glass bottle of 1.35 L volume) × 3 temperatures (5, 25, and 60 degrees in Celsius)), and performed a quantitative analysis of limonene, β-pinene, γ-terpinene, and citral in the gases by a gas chromatography-mass spectrometry (GC-MS) measurement. As results, we found that the effect of the temperature of aromatic gas was dominant for the evaluation items; cleanliness, refresh feeling, relaxing, and preference, and that the lemon aroma less or equal 25 degrees in Celsius was effective for the impressions of cleanliness, refresh feeling, relaxing, and preference.