# Cellulose as a Delivery System of Raspberry Juice Volatiles and Their Stability
## 2 Results
### Evaluation of Volatiles
All three of them were evaluated in the highest amount in complexes obtained with 5% of cellulose. A fruity flavor note ketone, 1-phenylethanolamine, was evaluated in the highest amount after 60 min of complexation, while two other floral flavor notes ketones, after 15 min of complexation (10.18 \(\upmu\)g/kg and 2.91 \(\upmu\)g/kg, respectively). Sixteen terpen were detected in cellulose/raspberry complexes. Figures 3 and 4 additionally present the variation of the most important terpen responsible for the berry flavor note. \(\beta\)-Ionone and \(\alpha\)-ionone, the most important raspberry flavor components [38; 39] that produce the fruity, raspberry type flavor, displayed the highest amounts (45.90 \(\upmu\)g/kg and 29.90 \(\upmu\)g/kg, respectively) in the samples with 2.5% of cellulose prepared by 15 min complexation. Both of these volatiles were lost during prolonged complexation. Figure 4: Amount of berry volatiles on cellulose/raspberry complexes after 60 min of complexation and after storage (2.5%, 5%, 7.5% and 10%—amounts of used cellulose; 60—time of complexation; S—storage). Figure 3: Amount of berry volatiles on cellulose/raspberry complexes after 15 min of complexation and after storage (2.5%, 5%, 7.5% and 10%—amounts of used cellulose; 15—time of complexation; S—storage). The same behavior was observed for dihydro-\(\beta\)-ionone and \(\alpha\)-ionol, volatiles with berry flavor notes. Dihydro-\(\beta\)-ionone had the highest amount in complex with 2.5% of cellulose (26.13 \(\mathrm{\SIUnitSymbolMicro g}\)/ kg) and \(\alpha\)-ionol in complex with 5% of cellulose (23.53 \(\mathrm{\SIUnitSymbolMicro g}\)/ kg). The amount of cellulose used didn't appear to have an influence on adsorption of dihydro-\(\beta\)-ionol after 15 min of complexation while after 60 min lower amounts of this compound were adsorbed on cellulose when it was used in higher amounts (7.5% and 10%) for complexation. \(\beta\)-Damascenone was evaluated in slightly higher amounts when 15 min of complexation was applied, but it was adsorbed in the highest amount with 5% of cellulose regardless of complexation time. Linalool was determined in the highest amount among all identified terpenes. During 15 min of complexation with the increase of cellulose used a decrease of adsorption of this volatile occurred. 5% cellulose caused the highest adsorption (57.52 \(\mathrm{\SIUnitSymbolMicro g}\)/kg) of linalool during 60 min of complexation. Adsorption of linalool oxide was quite high when cellulose was used in higher amounts (7.5% and 10%) for 15 min of complexation (around 5.6 \(\mathrm{\SIUnitSymbolMicro g}\)/ kg). Prolonged complexation caused a loss of this volatile. Nerol, geraniol and \(\alpha\)-terpinolene showed a similar behavior. Fifteen min of complexation caused the highest adsorption of these volatiles onto 2.5% of cellulose and when increased amounts of cellulose were used, a decrease of adsorption of these volatiles was observed. On the other hand, through prolonged complexation the highest amount of these volatiles was observed with 5% of cellulose. Myrtenol was observed in the highest amount when a lower amount of cellulose was used, regardless of the time of complexation. Two alcohols were detected in cellulose/raspberry complexes, 2-ethylhexanol and decanol. The highest amount of 2-ethylhexanol, with a sweet, fruity flavor note, was in complexes prepared for 60 min with 5% of cellulose (35.09 \(\mathrm{\SIUnitSymbolMicro g}\)/kg), and in this case prolonged complexation had quite a high impact on the adsorption of this volatile onto cellulose. For the other alcohol, decanol, with fruity, citrus flavor notes, the time of complexation did not play such an important role and it was determined in the highest amount in complexes prepared for 15 min with 10% of cellulose (3.28 \(\mathrm{\SIUnitSymbolMicro g}\)/kg). Also, two acids were found in complexes.