## 3 Results and Discussion  
### Banana Peels Analysis  
In the study's first phase, we evaluated the basic qualitative and quantitative parameters of the banana peels used as raw material. The results are shown in Table 1.  
The dry matter content was 11.75%. This result is consistent with the 8.7-18.7% range reported by [PERSON] et al. [50]. The cellulose content was 10.09% DM, which is confirmed by the data presented by [PERSON] et al. [51] (7.5-18.7% DM) and [PERSON] et al. (6-15% DM) [52]. [PERSON] et al. [53] also reported a cellulose concentration in dry matter of 9.9% DM, which is very close to our result. [PERSON] et al. [54] report a relatively wide range of cellulose content in banana peels of 18-60% (\(w/w\)). It should also be emphasised that the authors cited above stress that the BP chemical composition depends on the variety of fruit, their degree of ripeness at the time of harvesting, and the method of storing whole fruit and, later, the peel. Therefore, when comparing the results of banana peel composition, it is better to focus on ranges of values rather than specific values, as they may be the result of the factors mentioned above, which are usually not precisely defined in the articles.  
The hemicellulose fraction determined by us was 36.89% DM (Table 1). Together with cellulose, they make up almost half of the dry matter of the peels, which we considered a promising potential for use for yeast cell conversion in the case of efficient hydrolysis. [PERSON] et al. [54] (17-40% DM), [PERSON] et al. [53] (41.38% DM) and [PERSON] et al. [51]  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Parameter** & **Value** \\ \hline dry matter [\%] & 11.75 \(\pm\) 0.57 \\ \hline cellulose [\% DM] & 10.09 \(\pm\) 0.18 \\ \hline hemicellulose [\% DM] & 36.89 \(\pm\) 0.95 \\ \hline lignin [\% DM] & 9.62 \(\pm\) 0.4 \\ \hline pectin [\% DM] & 8.27 \(\pm\) 0.2 \\ \hline crude protein [\% DM] & 7.22 \(\pm\) 0.659 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Results of the analysis of the banana peels used in the experiments.  
(40-41.4% DM) reported similar hemicellulose contents in banana peels to ours. The lignin content we determined was 9.62% of the dry matter of the peels, which is confirmed in the scientific publications presented so far. [PERSON] et al. [55] report a concentration range of 6-12% DM for lignin; other reports are [PERSON] et al. [54] 16-31% DM, [PERSON] et al. [51] 3.2-16.8% DM, [PERSON] et al. [53] 8.9% DM and [PERSON] et al. [52] 7.3-15% DM.  
The pectin content of our raw material was 8.27% DM (Table 1), which is close to the range reported by [PERSON] et al. [55] (10-21% DM) and the range of 10-20% DM given by [PERSON] et al. [54]. [PERSON] et al. [48] also reported a similar pectin content in peels of 13-5.9% DM. The valuable crude protein content for feed purposes in our sample was 7.22% DM, which is confirmed by the general range of 2.2-10.6% reported in the literature [50; 51; 52]. Summarising the obtained contents, it should be emphasised that due to the vast number of banana varieties, the way they are grown, harvested, ripened, and stored, the composition of all parts of the plant, including banana peels, is subject to fluctuations, and individual results can be verified by referring to the ranges of values given in the literature. The high total content of cellulose and hemicellulose was promising for us, as it suggested the potential yield of biomass from yeast grown in banana peel hydrolysates.