INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Microencapsulation of a low trans fat as affected by formulation and physical state of a matrix
Autor/es:
MARINA CERDEIRA; ROBERTO J. CANDAL; MARÍA LIDIA HERRERA
Lugar:
Seattle, WA, USA
Reunión:
Congreso; 99th American Oil Chemists´Society (AOCS) Annual Meeting and Expo; 2008
Institución organizadora:
American Oil Chemists´Society
Resumen:
A low-trans fat blend with crystalline material formulated with 40 wt. % sunflower seed oil (SFO) in high melting fraction (HMF) of milk fat was encapsulated by freeze-drying emulsions. The matrix was a 20 wt. % trehalose aqueous solution. The selected emulsifiers were a mixed of 50 wt. % of the palmitic sucrose esters (SE) P-170 and P-1670, sodium caseinate (NaCas) or a 50 wt. % blend of SE and NaCas. Initial efficiency of encapsulation and the ability to retain the core material with time was studied by storing the powders at different water activities. Efficiency of encapsulation was strongly dependent on emulsifier type. Initial retention value was 89.7 ± 0.1 for NaCas formulation. SE and SE/NaCas formulations, however, were less efficient. Retention values were 64.9 ± 0.8 and 55.5 ± 1.0, respectively. NaCas formulation was also more efficient retaining core material during storage. The formulation with a protein and a small surfactant had the lowest performance. Retention with time was determined by the counteracting effects of interactions among stabilizers, matrix and core material, crystallinity of matrix and droplet size distribution.
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