The invention relates to a novel method for extracting a seaweed intermediate by an
enzyme process, which comprises the following steps: sufficiently cleaning and immersing dry
Laminaria digitata, adding into an acidic solution, and stirring uniformly to obtain a mixture A; dissolving a composite acidic
enzyme in water, and adding into the mixture A to perform primary stirring extraction, thereby obtaining a mixture B; dissolving an inorganic alkaline compound and a composite alkaline
enzyme in water, and adding into the mixture B to carry out secondary stirring extraction, thereby obtaining the mixture C; and dissolving a preserving agent in water, adding into the mixture C, and stirring uniformly to obtain the seaweed intermediate. The method for preparing the seaweed intermediate is efficient, quick, mild, comprehensive, safe and harmless. Compared with the traditional acid-alkali extraction technique, the extraction efficiency is enhanced by 50% above, the
algal polysaccharides content is enhanced by 50-100%, the
alginic acid content is 3.5-4.0, the effect of the seaweed
intermediate product is obviously enhanced, and all the effective components in the seaweeds are reserved in the product, thereby implementing complete-effect addition in deed.