## 3 Results and Discussion  
Instability, volatility, reactivity, and inclination towards degradation are responsible for significant changes in aroma volatile components, which altogether has significant economic and health consequences. These deteriorations are particularly expressed at room temperature [3; 20]. Therefore, storage at room temperature was chosen for stability testing. By ensuring the stability of aroma volatile compounds at room temperature, the application of these components is facilitated, the storage and transportation processes of such products are simplified, and health risks are reduced. Easily available and low-cost constituents were selected for the design of NADES: glucose, sucrose, glycerol, sorbitol, proline, betaine, and ethylene glycol. The viscosity of NADES could represent an obstacle to applying NADES; however, it could potentially have a positive effect on the stabilizing capacity of NADES because it slows down the movement of molecules [21]. Therefore, NADES with wide viscosity ranges were used in this work (Table 1). At the beginning (month 0), the headspace composition of _S. montana_ extracts dispersed in different NADES (CO\({}_{2}\)-NADES systems) was established, followed by monitoring of the changes in the headspace profiles of the CO\({}_{2}\)-NADES systems after 3 and 6 months of storage at room temperature. CO\({}_{2}\) extract was used as a control, and its volatile profile was monitored in the same way. The _S. montana_ samples were found to be complex mixtures of components belonging to different chemical groups, such as hydrocarbons, alcohols, aldehydes, esters, ethers, ketones, phenols, and oxides. A total of 69 components were identified in the samples, which made up 83.06-98.97% of the headspace profile of the samples (Tables 2-4). Oxygenated terpen were predominant in the samples and accounted for 53.99-86.05% of the volatile profile, followed by sesquiterpene hydrocarbons 3.29-28.03%, monoterpene hydrocarbons 1.01-9.38%, oxygenated sesquiterpenes 0.17-13.27%, and non-terpenes 0.40-3.97%. Tables 2-4 show the headspace composition of the control and CO\({}_{2}\)-NADES systems at the start (month 0), after 3 months, and after 6 months of storage. Among the most dominant components in the samples were the isomeric monoterpene phenols carvacrol and thymol (6.38 \(\pm\) 0.97-31.44 \(\pm\) 3.21% and 5.65 \(\pm\) 0.36-23.48 \(\pm\) 1.77%, respectively). These two components are of exceptional commercial importance and have a wide spectrum of applications in other fields such as pharmacy, pharmacy, medicine, dentistry, cosmetics, food, veterinary, and agrochemistry [22]. According to the literature, _S. montana_ lipophilic extracts and essential oils mainly belong to phenolic chemotypes with dominant carvacrol and/or thymol. Therefore, the distribution of components established in this work was in accordance with the literature [23; 24]. Monitoring of the headspace profile (during 6 months) revealed changes in the chemical profile of the samples as a function of storage time. In the Bet/Gly/Suc/W sample, a constant decrease in thymol (from 20.84 \(\pm\) 2.68 to 14.02 \(\pm\) 3.14%) and carvacrol (from 25.56 \(\pm\) 4.22 to 16.70 \(\pm\) 2.50%) was observed during storage. Moreover, in the Bet/EG sample, thymol and carvacrol remained almost unchanged in percentage after the initial increase at 3 months, even after 6 months (Figure 1). In other samples, carvacrol had an increasing trend (after 3 months) and then a decrease after 6 months. Thymol in the control and Gly/Glu exhibited the same trend--an increase (after 3 months) followed by a decrease. While, in the other samples (Bet/Suc/Pro/W, Bet/Sor/W, Pro/Gly/Sor/W, and Gly/Glu/Sor/W), thymol had small oscillations in abundance after 3 months, followed by a decrease (after 6 months), possibly indicating the preserved stability of thymol in the first three months in these samples.