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Dietary fiber as one of the important effect of the functional food ingredients , more and more attention in the development of functional foods . Red algae sludge is agar, of Gracilaria and Kirin dishes marine red algae extract agar and carrageenan scraps , which are rich in water-insoluble dietary fiber components , has been used as garbage disposal out . This study takes the red algae slag as raw material , respectively, using chemical , enzymatic and chemical extraction methods - enzyme combined with law hydrolyzed protein enzymatic hydrolysis of fats , preparation of insoluble dietary fiber , and several ways to extract the insoluble dietary the fiber content were analyzed and compared. Optimum extraction process through various methods of single factor test and orthogonal test analysis comparison, the insoluble dietary fiber : solid to liquid ratio of 1:8 , the pH of the solution was adjusted to 9 , followed by the addition of 0.4% trypsin and 6% of the lipase , 40 ℃ treated 3h, washed until neutral , dried 60 ° C thermostated 4H , sifted through a 80 mesh sieve , i.e. Debu insoluble dietary fiber , 54.0% yield . In addition , in order to improve the whiteness of insoluble dietary fiber , insoluble dietary fiber obtained by the best extraction process twice bleached orthogonal experiment , the comparative analysis bleached optimum conditions : a bleached feed solution ratio 1:5, the concentration of sodium hypochlorite solution has a rating of 8 % , a pH value of 4 , a bleaching time of 30 min , the whiteness of their products increased from 6.20 to 54.10 , sensory was beige . Development of insoluble dietary fiber content of up to 93.61% , 1.42% protein , 1.37% fat , the whiteness 54.10 . Its water holding capacity and expansion force respectively of 5.05g / g and 6.47mL / g , are higher than the standard ( the expansion force of 4 mL / g Global wheat bran and dietary fiber , water holding 4g / g ) .
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