4. Conclusion
The chemical and physical characteristics of BO are close to
those of peanut oil and olive oils. The changes in fatty acids profile
during storage and between treatments with and without nitrogen
blanket were slight. Significant decrease was observed in gadoleic
acid after 120 days of storage of BO without nitrogen blanket.
Iodine value and acidity of BO increased with storage time. BO
stored under nitrogen blanket showed lower peroxide values. BO
viscosity resembled peanut and olive oils. Regarding sensory
analysis, BO at initial time showed more sensory similarities to
samples under nitrogen blanket until 120 days of storage. Samplesstored without nitrogen blanket presented fishy and soybean oil
flavors, besides higher peroxide value. However, samples with 60
and 180 days of storage showed more descriptive attributes related
to baru, peanut and Brazil nut, olive oil and viscosity. Although
sensory descriptive and chemical analysis have indicated changes
in oils during storage, acceptance was not negatively affected by
those changes in BO. Peroxide and acidity values were acceptable
after 180 days of storage for all samples, indicating that BO can be
commercialized with a shelf life of six months. The impact of nitrogen
blanket was significant from the descriptive standpoint so
that the cost-benefit of this step should be taken into consideration
for a higher sensory quality, in spite of not being mandatory for the
processing and marketing of BO in the evaluated period of time. BO
can be applied in salad dressings with satisfactory acceptance.
Further studies are necessary to assess antioxidants and volatile
compounds and their changes during storage, as well as their
relation with sensory profile of BO.