Alpha-amylase and alpha-glucosidase inhibition is differentially modulated by fucoidan obtained from Fucus vesiculosus and Ascophyllum nodosum

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• 作者：Kyung-Tae Kim ; Laurie-Eve Rioux ; Sylvie L. Turgeon
• 关键词：Brown seaweed ; Fucus vesiculosus ; Ascophyllum nodosum ; Harvest season ; Fucoidan ; Sulfated fucan ; 伪-Amylase ; 伪-Glucosidase ; Enzyme inhibition ; Type 2 diabetes
• 刊名：Phytochemistry
• 出版年：February, 2014
• 年：2014
• 卷：98
• 期：Complete
• 页码：27-33
• 全文大小：604 K

文摘

Fucoidan is a water-soluble, negatively charged, biologically active polysaccharide found in great abundance in brown marine algae. However, the inhibition of 伪-amylase and 伪-glucosidase by fucoidan derived from two algal species (Ascophyllum nodosum and Fucus vesiculosus) harvested at different periods (accounting for seasonal and yearly variations) has never been investigated. It was found that fucoidans inhibited 伪-glucosidase differently, depending on the algal species from which it was extracted and the algae鈥檚 season of harvest. Fucoidan extracted from A. nodosum was a more potent inhibitor of 伪-glucosidase, with an IC₅₀ ranging from 0.013 to 0.047 mg/mL, than the inhibition by fucoidan extracted from F. vesiculosus (IC₅₀ = 0.049 mg/mL). In contrast, fucoidan extracted from F. vesiculosus did not inhibit 伪-amylase activity, while fucoidan from A. nodosum decreased 伪-amylase activity by 7-100% at 5 mg/mL depending upon the algae harvest period. An IC₅₀ of 0.12-4.64 mg/mL for fucoidan from A. nodosum was found for the 伪-amylase inhibition. The ability of fucoidan to inhibit 伪-amylase and 伪-glucosidase thus varies according to the algae species and harvest period. A. nodosum is more suitable than F. vesiculosus as a source of fucoidan to inhibit 伪-amylase and 伪-glucosidase activities. Their potential benefits towards Type 2 diabetes management should be further investigated.