# Aroma Characteristics of Lavender Extract and Essential Oil from _Lavandula angustifolia_ Mill.
## 2 Results and Discussion
### Odor Property of Lavender Essential Oil  
The Lavender essential oil (LEO) was obtained by SD, and the mean value of the yields was 2.21% (g/g), which was much higher than that of [PERSON] et al. (2020) [1]. In accordance with Lavender extracts, the sensory evaluation and volatile analysis using GC-MS technology were applied to reveal the odor characteristics of Lavender essential oil. In total, forty-eight volatiles were identified, accounting for 96.53% of the total amounts of volatiles in LEO. The majority of these identified volatiles were alcohols (38.14%), esters (37.41%), alkenes (17.28%), ketones (1.18%) and a small number of aromatics (0.48%), aldehydes (0.28%) and heterocyclic compounds (0.02%). As can be seen in Figure 1C, the amounts of alkenes and alcohols in LEO were significantly higher than those in LE-EF, while the relative content of esters was much lower in LEO. Similar to the cases of LE, results obtained from Table 3 showed that linalyl acetate and lavandulyl acetate were the two most abundant ester compounds, accounting for 27.33% and 7.00% of the total amounts of volatiles, respectively, but were much lower than those in LE-EF. Linalool was the most abundant volatile in Lavender essential oil with a relative content of 29.01%, which was 1.72 times more than that found in LE-EF. No significant difference was found on the relative content of lavandulol between LEO and LE-EF. In contrast, the relative contents of linalool oxide I and linalool oxide II were lower than 0.50% in LEO, suggesting that they might have little contribution for the floral note of LEO. There were two alkene compounds with a relative content above 3.0%, namely (_E_)-\(\beta\)-ocimene and (_E_)-\(\beta\)-caryophyllene, imparting herbal and woody odors [28], respectively. The relative content of camphor was 0.38% in LEO, which was 2.92 times more than that found in LE-EF. However, the amount of camphor in LEO was far less than that observed in essential oil from Spanish Lavender ranging from 10-18% [3], which might be due to the different varieties used. In addition, 1-hexanol with green odor [29], \(\alpha\)-thujene with woody note [30], \(\alpha\)-pinene and \(\beta\)-pinene imparting woody or herbal odors [31], camphene with woody flavor [32], nerol with citrus and floral odors [33], \(\alpha\)-humulene with woody odor [34] and \(p\)-cymene as well as \(o\)-cymene were identified in LEO, but not in Lavender extracts. Nerol oxide with green, leaf and floral odors [35] was detected in Lavender essential oil for the first time. A total of twenty-five volatiles were commonly identified in LEO and LE-EF, including limonene, (_E_)-\(\beta\)-ocimene, (_Z_)-\(\beta\)-ocimene, linalool and its oxides (I and II), camphor, lavandulol, (_E_)-\(\beta\)-caryophyllene and (_E_)-\(\beta\)-farnesene, among which linalool and lavandulyl acetate imparting floral notes were the most abundant volatiles with relative contents higher than 10.0%. In addition, the essential oils contained significantly lower amounts of linalyl acetate, lavandulyl acetate and linalool oxides (I and II) than those of the lavender extracts, whereas the amounts of linalool and camphor were significantly higher than that in LE-EF. The LEO had a strong floral note, and moderate spicy, camphor-like, herbal, woody, pine-like, clove-like, hay and medicine-like odors (Figure 2C). The intensity of camphor-like, herbal and woody odors were higher than those in LE-EF, while the remaining attributes were opposite. In addition, the aroma attributes of watery and green notes with strong intensity as well as moderate earthy odor were only found in LEO. 1-Hexanol might be the contributor for the green note in LEO, and the