Effect of selenium enrichment on antioxidant activities and chemical composition of Lentinula edodes (Berk.) Pegl. mycelial extracts.
Preparations derived from Lentinula edodes (Berk.) Pegl. mycelium are worldwide used as dietary supplements containing compounds active as immune system enhancers, demonstrating chemopreventive and anticancer activity. L. edodes mycelium enriched with organic forms of selenium like selenized yeast possess putative, higher cancer preventive properties. The objective of this study was to test the effect of enrichment in selenium on antioxidant, reducing and free radical scavenging activity of water and alcohol extracts from mycelium of L. edodes (Berk.). To elucidate the cause of enhanced antioxidant activity of extracts, a preliminary selenium speciation by specific oxido-reduction reaction was performed. Se-enrichment enhanced antioxidant activity, reducing power and free radical scavenging effect of mycelial extracts by almost 100-400%. Increase of activity was particularly high for diluted extracts (concentrations 0.1-0.5 mg/ml). The chemical composition of extracts from both Se-enriched and non-enriched mycelium was compared by determination of polyphenols, proteins, carbohydrates and lipids. Results showed that Se-enrichment enhanced antioxidant activities of mycelial extracts, likely by high amounts of organic Se-compounds (-II oxidation state) and elemental red selenium, and by increased polyphenols content. Our results suggest that Se-enrichment is a good method for enhancement of important activities of human dietary supplements, including Shiitake preparations.
Turło
Jadwiga
J
Department of Drug Technology, Medical University of Warsaw, Banacha 1 St., 02-097 Warsaw, Poland. jadwiga.turlo@wum.edu.pl
Gutkowska
Bozenna
B
Herold
Franciszek
F
D000975:Antioxidants / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004338:Drug Combinations; D004357:Drug Synergism; D005419:Flavonoids / Q000032:analysis; D008041:Linoleic Acids / Q000737:chemistry; D008751:Methylene Blue / Q000737:chemistry; D025282:Mycelium / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis; D010936:Plant Extracts / Q000737:chemistry*; D059808:Polyphenols; D012643:Selenium / Q000032:analysis; D020942:Shiitake Mushrooms / Q000737:chemistry*; D018038:Sodium Selenite / Q000737:chemistry*; D013858:Thiobarbiturates / Q000737:chemistry
D000975:Antioxidants; D004338:Drug Combinations; D005419:Flavonoids; D008041:Linoleic Acids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols; D013858:Thiobarbiturates; C046058:1,3-diethyl-2-thiobarbituric acid; D012643:Selenium; D018038:Sodium Selenite; D008751:Methylene Blue