Resumen:
Tamarind seed mucilage (TSM) was evaluated as a novel wall material for microencapsulation of sesame oil (SO) by spray-drying method. Wall material:core ratios of 1:1 (M1) and 1:2 (M2) were considered, and the corresponding physical and flow properties, thermal stability, functional groups composition, morphology, encapsulation efficiency, and oxidative stability were evaluated. Powder of M1 and M2 microcapsules exhibited free-flowing characteristics. The particle size distribution for M1 microcapsules was monomodal with diameter in the range 1-50 μm. In contrast, Microcapsules M2 presented a bimodal distribution with diameter in the ranges 1-50 μm and 50-125μm. M1 microcapsules were thermally stable until 227 °C and microcapsules M2 until 178 °C. Microcapsules M1 and M2 exhibited a dominant amorphous halo and external morphology almost spherical in shape. Encapsulation efficiency was 91.05% for M1 and 81.22% for M2. Peroxide formation reached values after six weeks was 14.65 and 16.51 mEq/kgOil for M1 and M2 respectively. Overall, the results led to the conclusion that tamarind mucilage is a viable material for high microencapsulation efficiency, while offering protection against oxidation mechanisms of SO.
Descripción:
The present study revealed the possibility of encapsulating sesame seed oil by spray drying using tamarind seed mucilage as a wall material achieving high-efficiency values and delaying oxidation mechanisms of oil. A characteristic feature is the use of higher relations Wm:Co than commonly used on microencapsulation of 1:1 and 1:2, for M1 and M2, respectively. Encapsulation efficiency presented greater values for M1 microcapsules (91.05%) than to M2 (81.22 %) microcapsules. Hence, the most ideal system among this study was M1, leading to the optimal encapsulation efficiency for the microencapsulation of SO with the lowest proportion of surface oil. For all temperatures, the stability of the peroxide value was increased with encapsulation efficiency (M1 > M2). The variation of oil load in microcapsules having different core-to-wall ratio also affected the oxidative stability of the encapsulated oil, this effect was greater in M2 with higher PV than in M1, because, a higher surface oil allows peroxides formation. The limit of peroxides set for human consumption free SO was achieved at the first week of storage and M1 and M2 microcapsules was reached at the fourth week. These results clearly showed that the TSM used on the microencapsulation process as a new wall material provided an effective protection against oxidation during the storage of SO. The introduction of tamarind seed mucilage (TSM) as a wall material for encapsulation, corroborates the manageability, thermal stability, efficiency, and viability when protecting oils susceptible to oxidation processes, even though, when encapsulating high amounts of oil.
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