## 3 Results and Discussion
### Water Activity and LF NMR Relaxometry  
The NY and AY trials showed \(\mathrm{a_{w}}\) values of 0.2741 \(\pm\) 0.0001 and 0.1660 \(\pm\) 0.0001, respectively. Measurements of water activity carried out for the YBMCs showed different values of \(\mathrm{a_{w}}\) in the measuring chamber, which made it impossible to unambiguously characterize the value of this parameter. This means that there is no water available for the YBMCs to show any possibility of evacuation. All the water is trapped in the YBMCs structure.  
LF NMR is a method used in food analysis since the 1990s [56; 57; 58; 59]. It is a fast and accurate alternative to the use of drying and solvent extraction for determining the fat and moisture content of a biological system and is particularly suitable for the analysis of complex systems such as food products [60; 61]. It involves measurements of the relaxation time of spin-lattice T\({}_{1}\) and spin-spin T\({}_{2}\). Both parameters characterize the molecular dynamics of oil and water protons in the tested sample. Changes in their values reflect the relative changes in bulk water relative to bound water (T\({}_{1}\)) or describe the molecular dynamics of protons fractions. The analysis of the molecular dynamics of water in the tests, carried out by LF NMR methodology, showed that in NY and AY, significant differences had occurred for the values of spin-lattice relaxation times T\({}_{1}\) (Figure 7). The spin-lattice T\({}_{1}\) relaxation times for the YBMCs obtained from NY are longer, which may indicate a greater ordering of molecules containing protons [62; 63].  
Figure 7: T\({}_{1}\) relaxation time values.  
As in the case of changes in \(\mathrm{a_{w}}\), higher values were found in all NY samples, which means greater mobility of water molecules. Plasmolysis removed the internal yeast organelles and thus facilitated the encapsulation of the oil, hence the lower T\({}_{1}\) time value. Better encapsulation is also evidenced by the lower thermodynamic changes observed in the DSC analysis (see Section 3.5). Comparison of the T\({}_{1}\) values for the YBMCs showed that the largest (26%) difference between the NY and AY trials was recorded for CRb, and the lowest (5%) for RBWg.  
The values of spin-spin T\({}_{2}\)* times, presented in Figure 8, were also analyzed by using the shape of the free induction decay (FID) signals. YBMC samples containing oils are characterized by signals that are exponentially decaying. This exponentially decaying signal comes from the mobile liquid protons fraction. Thus, the results indicate that these relaxation time signals come only from the encapsulated oil, as confirmed by the results from the DSC.  
Additionally, when analyzing the shape of the FID signals (Figure S1), it was found that only NY and AY were characterized by two times T\({}_{2}\)*, described by the Gaussian curve and the exponential curve [64, 65]. The Gaussian function comes from the solid proton fraction. In combination with the aw results, a very short T\({}_{2}\)* time of 0.03 ms for NY and 0.05 ms for AY can be attributed to the unstructured water molecule. No water activity was recorded in the YBMCs; therefore, it should be concluded that the exponential components of the T\({}_{2}\)* times are the result of the relaxation of the protons of the structural components of oil.