Abstract: The kelp contains a variety of biological active ingredients, such as kelp acid,brown alga acid,mannitol and fucoidan,among which fucoidan has hypolipidemic effect on anti-blood congealing,inhibits the growth of tumor cells to regulate immune function,anti-radiation effects.
In view of the fact that fucoidan has many health functions,and China has abundant seaweed re - sources,therefore,the development to the kelp resources,intensive processing and the comprehen- sive utilization,the full display and the use fucoidan which is natural polysaccharide resource,to enhance the kelp added value and to develop our country kelp resources processing has the pro- found significance.This paper uses the sour formulation to extract the fucoidan from the kelp,uses the ethyl alcohol graduation precipitation method to carry on the purification. Focuses on the extr- action time,the temperature,pH,solid to liquid ratio on the extraction rate. The result indicated that in the extraction temperature 70℃,pH 2.0,70% ethyl alcohol density,extraction 4 h,the extraction rate is 7.3%.
Key words: kelp; fucoidan;acid distill;precipitation