Selenium uptake and associated anti-oxidant properties inPleurotus fossulatuscultivated on wheat straw from seleniferous fields

Abstract

The present study was carried out to examine the antioxidant activity in oyster mushroom cultivated on selenium (Se) rich substrate. Pleurotus fossulatus was cultivated on Se-rich wheat straw collected from the seleniferous belt of Punjab (India) and its potential to accumulate Se from substrate was examined. Using different assay systems the modulations in the anti-oxidant profile of Se enriched mushroom was studied in comparison to the mushrooms cultivated on normal straw. The oyster mushrooms were observed to potentially mobilize Se from Se-rich substrates to fruiting bodies, resulting in significantly high uptake (37.2±0.6 mg g -1 ) as compared to control (3.57±0.53 mg g -1 ). The antioxidant activity, as determined by various assays, such as reducing power, 2,2-diphenyl-1-picrylhydrazyl free radical scavenging, and metal chelating activity, was higher in the experimental mushrooms when compared to control. The results obtained demonstrate that Se-fortified mushrooms through cultivation on straw containing organic forms of Se can be considered as natural and effective dietary supplements of organic Se for humans. The present study proposes the use of Se-rich agricultural residues as substrates for mushroom cultivation for human and livestock supplementation.

Selenium‐enriched Coriolus versicolor mushroom biomass: potential novel food supplement with improved selenium bioavailability

“…Their activity depends on the type of metal and the specific characteristics of the biological groups that contain selenium. 41 Selenium-enriched extracts showed better reducing power compared to the control sample (Fig. 3C).…”

“…It is assumed that high ability for metal ion chelation of selenium‐enriched mushrooms is due to specific Se–metal interactions. Their activity depends on the type of metal and the specific characteristics of the biological groups that contain selenium . Selenium‐enriched extracts showed better reducing power compared to the control sample (Fig.…”

“…The results for antioxidant activity are similar to previously reported data. 20,41 Such a good antioxidative effect of selenated samples is achieved most probably a result of the high content of elemental selenium in the mushroom mycelium, the biological role of selenium in protecting the organism from oxidative damage being well known. 1,2…”

Acute Toxicity of Seleniferous Pleurotus Geesteranus Mycelia and Antioxidation against D-galactose-induced Mice

“…Comparatively, the approach of culturing microorganism like edible fungi or yeast with Se-enriched medium has performed more efficacious than it of cropping plants and feeding animals for producing organic seleniferous products [17][18][19][20]. This is due to fungal characters in quick growth, short life time and efficient metabolism especially in biotransformation of inorganic elements.…”

“…The efficiency in selenium enrichment with mushrooms biotransformation is biologically relative to the threshold limit value in selenium for different mushroom species [19,[22][23][24] in addition to varying of bioavailability against selenium sources, such as wheat bran enforced sodium selenite [20], wheat straw harvested from seleniferous region [17] and coffee rusk enforced sodium selenite [21]. The tolerance level of Pleurotus geesteranus mycelium against Se element in Sodium selenite has been confirmed around 3-5 µg/g or µg/ml, which enhances growth for seleniferous mycelium significantly [19,20].…”