## 3 Results and Discussion  
Emulsion quality is a concept that consists of many physical and chemical interactions that indicate that an emulsion changes its appearance. To prepare a stable system, appropriate emulsifiers or stabilizers must be used. Often, the use of a given emulsifier is more beneficial to the stability of an emulsion by using it with a suitable thickener (stabilizer). The selection of these two components often allows one to obtain a long-term emulsion \begin{table}
\begin{tabular}{l l l} \hline \hline
**Category Symbol** & **Category Description** & **TSI (\(-\))** \\ \hline A+ & excellent system stability & \textless{}0.5 \\ A & good system stability & 0.5–1 \\ B & satisfactory stability of the system & 1–3 \\ C & poor system stability & 3–10 \\ D & unsatisfactory stability of the system & \textgreater{}10 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Categories of system stability based on TSI values [25; 26]. (with high stability). In the presented work, the stability and physicochemical properties of emulsions based on modified fats, where the thickener was hydroxypropylmethylcellulose (HMPC), were evaluated. Figure 2 shows the profiles of backscattered light intensity as a function of sample height in the reference mode for emulsions E1-E15. The emulsions differed in their type of fatty phase and HPMC concentration. Using comparative analysis of \(\Delta\)BS profiles from successive scans for all emulsions during 31 days of storage, it was found that the most advanced destabilization changes were characterized by systems E13-E15, whose \(\Delta\)BS curves showed significant fluctuations across the height of the measurement dishes. They indicated significant dynamics in terms of the process of flocculation and coalescence, as well as creaminess. All of the above-mentioned processes had started already in the first days after the production of these systems. In general, after 7-14 days of storage, these emulsions were completely stratified (Figure 2). Analyzing the backscattered light intensity profiles over time for the E10-E12 systems, it was found that the \(\Delta\)BS records were characteristic of the occurrence of changes in the average droplet size or their aggregation, thereby progressing flocculation or coalescence-type processes. It was also found that a gravitational separation process was present in these systems, which resulted in the migration of fat phase droplets into the upper parts of the vials and the formation of a clear layer in the lower parts of the vials. Unlike the E13-E15 emulsions, these changes did not lead to complete phase separation after 31 days of storage. All of the E10-E15 emulsions discussed were characterized by very-high-stability coefficient values, which ranged from 36.3 to 67.6. This classified these systems in category D, which confirmed their high instability [26] (Figure 3). Figure 2: _Cont._  
A decrease in the concentration of the dispersed phase in the lower parts of the vials and a simultaneous increase in the upper parts of the vessels due to gravitational migration processes were also observed for systems E4-E9 (Figure 2). The extent of these processes after the storage period was much less than for the above-discussed systems E10-E15. The curves showing ABS for the E4-E9 emulsion systems in the part of the graphs corresponding to the middle zone of the measurement vessels did not overlap. This unambiguously indicated the processes leading to an increase in the average droplet size of the dispersed phase, corresponding to the processes of flocculation and coalescence. It was observed that the average values of changes in the intensity of backscattered light in the middle part of the graphs were larger for systems E7-E9 (9.7-10.7%) than for E4-E6 (3.5-8.0%). This kind of observation leads to the conclusion that emulsions with a higher proportion of hemp seed oil in the fatty phase lost their stability faster.