Abstract: The microcapsule was prepared using yeast extract-sodium alginate-chitosan as wall and self-made fish oil as core by layer-by-layer(LBL) assembling technique. With surface structure, oil content, yield, effciency and release property as evaluating guidelines, the preparation conditions were optimized. Results showed that yeast extract-sodium alginate-chitosan as wall superior to is sodium alginate -chitosan on the above indexes, and it can save $5000 per ton.

Key words: yeast extract, layer-by-layer assembling, fish oil microcapsule