## 2 Results and Discussion
### Volatile Constituents in the Peel and Juice
On the other hand, the principal volatile components in the juice of the Pink Pearl CV were limonene (32.2%), followed by \(\gamma\)-terpinene (15.8%) and terpinen-4-ol (15.2%). Other compounds present at a concentration  
Figure 2: **(A)** Total volatile fraction between the juice and peel in all the three investigated finger lime cultivars (inner annulus) and total volatile content separately contained in the peel and the pulp (external annulus) in each investigated finger lime cultivar; **(B)** Distribution of the VOCs identified in the juice and the peel of the three investigated finger lime cultivars by chemical classes. MH: Monoterpene hydrocarbons; Sesqui: Sesquierpenes; E. Esters; Ald: Aldehydes; Al: Alcohols; MO: monoterpene alcohols; O: others. >1% were sabinene (7.3%), \(\alpha\)-terpinene (6.6%), \(\alpha\)-thujene (4.6%), \(\alpha\)-terpinolene (3.9%), \(\beta\)-phellandrene (2.5%), cis-\(\beta\)-ocimene (2.0%), p-cymene (1.6%), ledene (1.5%), \(\beta\)-myrcene (1.2%), and bicyclogermacrene (1.1%) (Table 1). Moreover, minor compounds, including 2-hexenal (0.2%), 1-hexanol (0.1%), 3-hexen-1-ol (0.2%), cis-sabinene hydrate (0.3%), trans-sabinene hydrate (0.2%), citronellal (0.3%), carvone (0.1%), \(\beta\)-citronellol (0.4%), \(\alpha\)-gurjunene (0.1%), calarene (0.1%), epizonarene (0.2%), \(\alpha\)-caryophilene (0.3%), \(\alpha\)-farnesene (0.1%), \(\alpha\)-muurolene (0.1%), sphatuelon (0.1%), and tetradecene (0.1%) were detected only in the peel, while aromadendrene (0.2%) was identified only in the juice (Table 1). Notably, ethyl acetate (E1), hexyl butyrate (E4), 2-butenal (Ald1), 2-hexen-1-ol (Al4), carvone (MO6), \(\beta\)-bourbonene (Sesq5), and epiglobulol (Sesq31) were detected only in the peel of Pink Pearl CV while trans-sabinene hydrate was observed both in the peel and in the juice, suggesting that these VOCs can be considered markers of this CV (Table 1). The chemotype of the Sanguinea peel was characterized by limonene/\(\gamma\)-terpinene/bicyclogermacrene (65.7/8.8/7.0%), with four other constituents detected at concentrations between 3.4 and 1.4%, including sabinene, ledene, \(\delta\)-elemene, and \(\beta\)-myrcene (Table 1). These results are in contrast with the VOCs composition of the essential oil of the peel of the CV Sanguinea investigated by [PERSON] et al. (2000), who reported that the main volatiles were bicyclogermacrene (26%), \(\alpha\)-pinene (10%), spathulenol (10%), and cis-\(\beta\)-ocimene (5.1%), while limonene represented only 1.2% of the total oil [6]. This discrepancy can be presumably ascribed to different factors, including the row material (peel vs. essential oil), the different pedo-climatic environment, and the diverse techniques used for the volatile's extraction. Limonene (66.8%), \(\gamma\)-terpinene (5.5%), and ledene (4.1%) were the most abundant components in the juice of CV the Sanguinea (Table 1). Other VOCs found at a concentration >1% were aromadendrene (3.8%), bicyclogermacene (3.5%), terpinen-4-ol (1.7%), \(\beta\)-myrcene (1.4%), cis-\(\beta\)-ocimene (1.3%), and \(\alpha\)-terpinolene (1.2%) (Table 1). Furthermore, cis-3-hexanal (0.1%), 2-hexenal (0.5%), citronellal (0.2%), linalool (0.3%), \(\beta\)-citronellol (0.1%), epibicyclosesquiphellandrene (0.1%), \(\beta\)-guaiene (0.1%), \(\beta\)-bisabolene (0.1%) tetradecene (0.1%), and pentadecane (0.1%) were detected only in the peel. On the contrary, \(\alpha\)-phellandrene, \(\alpha\)-copaene, \(\alpha\)-muurolene, and sphatuelon, all at a percentage of 0.1%, were found only in the juice (Table 1). Remarkably, \(\beta\)-elemene (Sesq9) has been observed only in the VOCs profile of the Sanguinea peel, proposing that this sesquiterpene could be indicated as a potential marker for this variety. The chemotype of the Faustrime peel can be classified as limonene/\(\beta\)-phellandrene/\(\gamma\)-terpinene (29.3/21.1/9.5%) (Table 1).