Storage stability, release characteristics, and bioaccessibility of the tocotrienol-rich fraction (TRF) encapsulated in maltodextrin-starch sodium octenyl succinate microcapsules

Microencapsulation of hydrophobic bioactive compounds offers potential advantages for storage stability, release characteristics, and bioaccessibility. This study utilized a wall material comprising maltodextrin and starch sodium octenyl succinate in an 8:2 ratio to encapsulate a tocotrienol-rich fraction (TRF). The TRF was stabilized with an optimized treated pea protein isolate and flaxseed gum complex in a 3:1 ratio over a 13-week storage period at 40°C. Results indicated a slight increase in cohesiveness (5.36 %) and lightness (4.04 %), accompanied by a minor decrease in microencapsulation efficiency (3.32 %), yellowness (19.62 %), and chroma (18.56 %). The reconstituted microcapsules had a particle size of 4.18 ± 0.10 µm and a span of 2.81 ± 0.09. Moreover, the stored microcapsules demonstrated a low peroxide value of 5.40 ± 0.00 mq/kg and degradation of tocopherol and tocotrienol isomers (ranging from 16.45 ± 1.79–20.89 ± 1.20 %). They also remained stable under various ionic strengths and pH conditions. Post in vitro digestion, the microencapsulated TRF displayed higher bioaccessibility (40.81 ± 0.68 %) and release (85.77 ± 1.43 %) compared to bulk oil. These findings indicate the stability of microencapsulated TRF during storage and exposure to different ionic strengths and pH levels while enhancing bioaccessibility and release following in vitro digestion.

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