Preparation of microcapsules of flaxseed oil by blends of maize starch-octenyl succinic anhydride starch

Mixtures of native waxy maize starch (NWMS) and octenyl succinic anhydride starch (OSAS) were used as wall material to encapsulate flaxseed oil in order to reduce the production costs. The solution of OSAS and NWMS was treated with high-speed shearing, then spray-dried to make microcapsules. OSAS and NWMS were mixed at ratios of 5:0, 4:1, 3:2 and 2:3. Results in this study suggested that: OSAS to NWMS ratio had no effect on particle size; Encapsulation efficiency increased with the increase of OSAS proportion; Encapsulation efficiency of 61.45% was achieved when the ratio of OSAS to NWMS was 3:2. With the increase of NWMS proportion, the particle moisture increased and the particle surface became smoother. The study suggests that the blends of OSAS and NWMS have good potential as wall material for the encapsulation of flaxseed oil to reduce the production costs.