## 2 Results and Discussion
### Characterization of the Volatile Profile of Pomegranate Juiices
1-Hexanol, with characteristic herbal aromatic notes, was the predominant compound in all the juices analyzed with amounts ranging between 24.63 and 228.21 ug mL, followed by (Z)-3-hexen-1-ol found in the range 8.42-69.20 ug/mL, which is associated with green and leafy flavors. The relevance of these two compounds is consistent with previous studies conducted on pomeranate juice [44; 45]. [PERSON] et al. [44] reported concentrations of 1-hexanol that ranged between 8.95 \(\pm\) 0.27 and 168.44 \(\pm\) 5.86 ug/mL and quantities of (Z)-3-hexen-1-ol ranged from 5.29 \(\pm\) 0.07 to 42.82 \(\pm\) 5.40 ug/mL among pomeranate juices derived from fruits belonging to different ecotypes. Similarly, high percentages of these two compounds (21-44% of 1-hexanol, and 8.6-18% of (Z)-3-hexen-1-ol) were found in pomeranate juices obtained from five different accessions cultivated in Turkey [45]. These two components contributed to differentiating samples; in particular, the quantity of 1-hexanol was significantly higher in the TU1 and TU3 samples and lower in the DC  
Figure 1: The percentage compositions of the volatile chemical groups found in the total juice pomeranate obtained by all the accessions together (**A**) and in the juice of separate accessions (**B**). For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article. Figure 2: The amounts (ug/mL) of the volatile chemical groups found in the juice of each pomeranate accession. The different letters above each column indicate significant differences among the samples (Tukey’s test \(p\leq\) 0.05). For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article. cultivar, whereas (Z)-3-hexen-1-ol was significantly higher in LI1, TU1, and TU3 compared to AP2 and DC. Aldehydes constituted the second most abundant volatile group, ranging from 17.3 ug/mL for AP2 to 132.20 ug/mL for DC. Aldehydes were one of the most representative chemical classes in the overall volatile fraction of the analyzed pomergnate juices, as indicated in previous studies, in which aldehydes represented about 20-34% of the pomergnate juice volatile fraction [44]. Among aldehydes, the most abundant was hexanal, with the exception of TU1, in which it was almost absent. Hexanal, with herbal notes, was the most quantitatively abundant compound, although not present in all the samples, ranging from 0 ug/mL for TU1 juice to 101.00 ug/mL for DC, followed by 2-hexenal, associated with a sweet flavor, absent only in TU1 juice and detected at a maximum level of 22.32 ug/mL in LI1 juice. Hexanal, together with other volatile compounds such as the already mentioned 1-hexanol, (Z)-3-hexen-1-ol, and some terpen (\(\beta\)-pinene, limonene, \(\alpha\)-terpineol, and \(\beta\)-caryophyllene), is considered of fundamental importance in the definition of pomergnate juice aroma [46]. Other important aromatic compounds present in the juice samples were terpen and derivatives, including \(\beta\)-Myrcene, limonene, Eucalypttol, \(\gamma\)-Terpinene, \(\alpha\)-Cymene, \(\beta\)-linal, \(\beta\)-caryophyllene, terpinen-4-ol, menthol, alpha-terpineol, p-cymen-8-ol, and geranyl acetone, as well as other unidentified terpenic compounds. In particular, limonene ranged from 0.96 ug/mL for AP2 to 18.71 ug/mL for DC, and \(\beta\)-caryophyllene, present only in three samples, showed higher values in BA1 (15.78 ug/mL) and DC (12.12 ug/mL). These were followed by \(\alpha\)-terpineol and terpene ni, ranging from 1.17 ug mL and 0 for AP2 to 7.51 ug mL and 5.31 ug mL for DC, respectively. Besides \(\alpha\)-terpineol, \(\beta\)-linal, p-cymen-8-ol, and menthol were also reported to be detected in minor levels in the different pomergnate juices.