Exogenous Lycopeene Case Study

During the storage period, smaller decreases (P < 0.05) in the content of PUFAs were observed in the treatments that received dietary lycopene compared to those who were treated with exogenous lycopene (Table 1). The same pattern of changes was found in total SFAs and MUFAs. In view of these patterns of changes, although lycopene, both endogenously and exogenously added, was effective in slowing down the changes in FA composition of trout during refrigeration storage, fatty acids' profile of fillets that received dietary lycopene supplementation showed higher stability during refrigeration storage. The results also showed that among all groups, the highest level of dietary lycopene (360 mg/kg feed) was the most effective factor in slowing down the changes of FAs contents (P < 0.05).

3.4. Sensory evaluation
Table 2 shows the average scores given by the panelists to each of the attributes. No significant differences were detected among samples in the overall acceptability scores before storage, although the samples treated with exogenous lycopene received higher scores. According to the scale used, the fish samples were considered to be acceptable for human consumption until the sensory score reached 3.9. Acceptability scores for odor, color and texture of trout fillets evaluated by the panelists, decreased with time of storage, as
It can be seen (Table 2) that high acceptability grades, especially for samples which received exogenous lycopene, were scored during the first 9 days of storage for studied samples. Moderate grades then were obtained between days 9 and 12 of storage for samples receiving dietary lycopene. Nonetheless, the limit of acceptability for odor was attained after 12 days for fillet samples receiving dietary lycopene, while this limit was never attained for samples receiving exogenous lycopene throughout the entire storage