Abstract: The optimal conditions of bleaching and extracting of dietary fibre(DF) from Eucheuma were adopted by usingorthogonal and uniform design,and the dietary fibre were analysed. The results showed that bleaching with a concentration of 2g/ L bleacher under pH7.0 for 30min gaved the better results, and the extracting with a 4% (water: Eucheuma, L/g) ratio at 100 ℃ for 60min, and then added 0.15% protease and 0.1% α-amylase at 60～65℃ for 60min and 30min respectively gaved the best results. Under the optimal bleaching and extracting condition, the extracting ratio was 39.06%, the swollen volume was 38.6ml/ g, the water holding capacity was 2045.8%, the content of protein and fat were lower with no starch, but contained higher mineral element—Ca, P and K. The functional indexes above were higher than standard dietary fibre—wheat bran and dietary fibre from Eucheuma extracted chemically, suggesting that dietary fibre from Eucheuma bring into play a larger physiological efficacy on body.

Key words:  , uniform design； Eucheuma； dietary fibre； extract；