Comparison of the Oxidative Stability and in Vitro Digestive Properties of Structural Lipid Microcapsules Composed of Two Different Wall Materials
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Abstract:
Two different wall material formulations (formulation 1: sodium caseinate/maltodextrin; formulation 2: whey protein/lactose) were selected for the microencapsulation of structural lipids, and their oxidative stability and in vitro digestive properties were determined and compared. After oxidation, the peroxide value (POV), thiobarbituric acid reactive substances (TBARS), and acid value of unencapsulated structural lipids increased by 55.199 meq/kg, 4.532 mg/kg, and 0.280 mg/g, respectively, whereas their contents of total monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs) decreased by 9.621% and 15.664%, respectively. Meanwhile, the POV, TBARS, and acid value of encapsulated structural lipids with formulation 1 increased by 16.438 meq/kg, 1.348 mg/kg, and 0.124 mg/g respectively, whereas their total MUFA and PUFA contents decreased by 5.630% and 9.368%, respectively. Furthermore, the POV, TBARS, and acid value of encapsulated structural lipids with formulation 2 increased by 13.255 meq/kg, 1.176 mg/kg, and 0.127 mg/g, respectively, whereas their total MUFA and PUFA contents decreased by 5.163% and 8.551%, respectively. Regarding in vitro digestive properties, the maximum particle size, electric potential, and fatty acid release rate of unencapsulated structural lipids during digestion were 907.6 nm, -20.45 mV, and 69.366%, respectively. Meanwhile, these values were 2 355.5 nm, -10.15 mV, and 59.986%, respectively, for encapsulated structural lipids with formulation 1, and 1 449.65 nm, -18.75 mV, and 65.365%, respectively, for encapsulated structural lipids with formulation 2. In conclusion, both formulations can significantly improve the oxidative stability of structural lipids, although the larger particle size of encapsulated structural lipids with formulation 1 during digestion can delay fatty acid release; therefore, formulation 2 is considered ideal as a capsule wall material for structural lipids.
