Preparation of Se-enriched Polysaccharides from Catathelasma ventricosum by Two Approaches and Their Antioxidant and Antihyperglycemic Activities
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Abstract:
The effects of selenium concentration on the productivity, amount of enriched selenium, conversion rate of organic selenium, and content of organic selenium per unit dry weight of Catathelasma ventricosum for two selenium enrichment methods (solid culture and liquid culture) were analyzed and evaluated. C. ventricosum was used as the carrier and sodium selenite as the selenium source. The results showed that under optimal selenium concentration conditions, 91.30 g dry fruiting body per kilogram of culture medium was obtained using the solid culture method, and the corresponding amount of enriched selenium, conversion rate of organic selenium, and content of organic selenium were 69.80 μg/g, 92.60%, and 64.63 μg/g, respectively. Using the liquid culture method, 4.50 g dry mycelia per liter of culture medium was obtained, and the amount of enriched selenium, conversion rate of organic selenium, and content of organic selenium were 199.50 μg, 84.60%, and 168.78 μg/g, respectively. Furthermore, the in vitro antioxidant and antihyperglycemic activities of fruiting body Se-polysaccharides, mycelial Se-polysaccharides, fruiting body polysaccharides, and mycelial polysaccharides were investigated. The results indicated that fruiting body Se-polysaccharides and mycelial Se-polysaccharides had higher antioxidant and antihyperglycemic activities than fruiting body polysaccharides and mycelial polysaccharides, likely because of the enrichment of selenium. In addition, selenium-polysaccharides exhibited higher antioxidant and antihyperglycemic activities than the positive control.
