## 3 Results and Discussion
In addition to having significant pharmacological properties [27], its presence in samples is essential because it is considered responsible for the more effective manifestation of the antimicrobial action of carvacrol. Namely, due to its hydrophobicity, it has a high preference for cytoplasmic membranes, allowing carvacrol to easily enter into the cell [28]. \(p\)-Cymene as a monoterpene hydrocarbon is more susceptible to changes compared to its oxidation derivatives. In the control, the stability of \(p\)-cymene was low compared to the CO\({}_{2}\)-NADES samples; so, its abundance in the control was reduced more than twice after 3 months, which coincided with the initial growth of carvacrol and thymol in the control. In the Bet/Gly/Suc/W sample, after 3 months, an increase in \(p\)-cymene of 2.8 times was recorded and, after that, a decrease to a percentage close to the initial one. In the other samples, \(p\)-cymene had significantly less oscillation over time, so its content was close to the initial one after 3 months. The highest abundance of \(p\)-cymene was in Bet-EG, where its percentage after 6 months (6.38%) was close to that at the start (7%). Furthermore, a reduction in carvacrol methylether was observed in the samples, which may have been due to its degradation to carvacrol and \(p\)-cymene [29]. Linalool increased in all samples after 3 months, and it increased even after 6 months in most of them, with the exception of Bet/Gly/Suc/W and Bet/Sor/W, where it stagnated after the initial growth. Growth of linalool has been reported during storage of lemon-flavored hard tea at room temperature [30]. According to [PERSON] et al. [30], the increase in linalool can occur due to autoxidation of myrcene [31], which, in the samples, was detected only at the beginning and also in Bet/EG in traces after 3 months. The increase in a minor compound \(\alpha\)-terpineol, which can be formed by oxidation of limonene, was also detected. The changes in the monoterpene alcohols terpinene-4-ol and borneol could also be attributed to the degradation reaction of hydrocarbons. Figure 1: Percentage distribution of the most significant compounds (thymol, carvacrol, thymoquinone, and \(p\)-cymene). The group of oxygenated sesquiterpenes showed an increase in the samples, corresponding to a decrease in sesquiterpene hydrocarbons over time. In the group of oxygenated sesquiterpenes, a total of three components were identified, with an increasing trend over time in all samples compared to the start, which was caused by the transformations of sesquiterpene hydrocarbons. The appearance of cryophyllene oxide after 3 months and an increase up to 6 months could be attributed to the oxidation of \(\beta\)-caryophyllene, which decreased over time. An increase in cryophyllene oxide was reported in the literature as one of the characteristic indicators of the aging of essential oil and lipophilic products [3]. The identification of viridiflorol in the samples after 6 months was in accordance with the decrease and disappearance of the corresponding sesquiterpene aromadendrene hydrocarbon ledene (viridiflorene). Also, apart from viridiflorol, another aromadendron derivative, alcohol spathulenol, was identified. In the control, a decrease in monoterpene hydrocarbons was observed approximately 3 times after 3 months. This trend in hydrocarbons in the control was in accordance with the literature's results, where a decreasing trend in low boiling hydrocarbons at room temperature storage was reported. Most likely, evaporation, oxidation, and other unwanted changes in the product constituents during the storage period were responsible for such changes [20]. On the other hand, in the CO\({}_{2}\)-NADES systems, the changes in the presence of hydrocarbons were significantly milder, mostly with a decreasing trend, potentially indicating that NADES improved the stability of these components compared to the control.