LIMA, J. A. M.; http://lattes.cnpq.br/9465124833114959; LIMA, Joana Angélica Matias de.
Résumé:
The use of lipids is a common strategy in ruminant diets, due to the increase in
energy density. However, there are limitations to its direct use. The objective of the
Fusion-emulsification technique was used to form microencapsulated systems
containing buriti oil (OB) at different concentrations 10 (OB10), 20 (OB20) and 30%
(OB30) (w/w) as core and wax of carnauba (CC) as a wall material. The
microencapsulated systems were characterized for microencapsulation yield (MY),
microencapsulation efficiency (ME) and by scanning electron microscopy (SEM),
thermogravimetry (TG), derivative thermogravimetry (DTG) and differential scanning
calorimetry (DSC) techniques. It was also evaluated for in situ behavior, using two male
Santa Inês rumen fistulated sheep with an average weight of 45.9 ± 5.93 kg and age of 2
years. The in situ technique was conducted in non-woven fabric bags [(TNT-100g/m2
(polypropylene)] with dimensions of 4.5x4.5 cm containing 3 g of sample and the
incubation times were 0, 1, 3 , 6, 9, 12, 24, 48, 72 h, for which ruminal and blood
parameters were also investigated. MY values were 97.89; 97.36; 97.87% and ME
values were 36±1; 50.4±1.84; 61.33%±1.52%, respectively, for OB10, OB20 and
OB30. The To extracted from TG curve was 224 and 254 °C for OB and CC,
respectively, while for OB10, OB20 and OB30 was 237, 240 and 236 °C, respectively,
indicating an improvement in the thermal stability of the oil after microencapsulation in
a similar way for all oil levels, showing a greater resistance that can also be reproduced
in the ruminal environment of microspheres did not interfere in a negative way in the
biochemical constituents of the blood. The use of carnauba wax as an encapsulant to
buriti oil proved to be a suitable alternative to promote adequate bypass effect in the
rumen, avoiding the toxicity of direct use due to the fatty acids present in the oil to
microorganisms, facilitating and improving its administration, since the oil can be
handled as if it were a solid, in addition to protecting bioactive compounds, with use in
larger quantities of this ingredient to ruminants safely.
