Abstract
Thirty-three species of marine invertebrates from the Sea of Japan were analyzed for contents of fucoidan hydrolases and some glycosidases. Fucoidan hydrolase activity was assessed by examining the effect of animal tissue extracts on fucoidans from the two brown seaweeds Laminaria cichorioides and Fucus evanescens, which have different structural characteristics. The activity of glycosidases (β-glucosidase, β-galactosidase, α-fucosidase, and α-mannosidase) was determined using p-nitrophenyl derivatives of sugars as substrates. It was found that glycosidases and fucoidan hydrolases of different specificities are fairly widely distributed among marine invertebrates. Mollusks and some species of echinoderms and arthropods showed the highest enzymatic activity. This research will enable us to choose organisms for the separation and study of fucoidan hydrolases and glycosidases, which may be useful in determining the structure of fucoidans.
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