sargassum horneri, alginate, fucoidan, response surface methodology, bleach, characterization, antioxidant, Food processing and manufacture, TP368-456

To solve problems of the low yields and dark color of Sargassum horneri polysaccharides which were produced according to the traditional extraction method under the high-temperature and alkalic condition, this study attempted to produce S. horneri polysaccharides at a lower alkaline treatment temperature of 60 ℃ and optimize the process parameters by the response surface methodology. The combined scores of alginate and fucoidan yields and whiteness index (WI) were used as assessment indices to identify the optimal process condition. Under the optimal extraction condition, the concentration of NaClO addition was changed to investigate its effect on various characteristics of the produced alginate and fucoidan. The results showed that the polysaccharide comprehensive score was significantly correlated with the alkaline concentration, the extraction time, and the dosage of NaClO (P