Browsing by Author "Cobos, Juan Diego Valenzuela"
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- Antioxidant and antimicrobial influence on oyster mushrooms (Pleurotus ostreatus) from substrate supplementation of calcium silicatePublication . Cardoso, Rossana V.C.; Carocho, Márcio; Fernandes, Ângela; Pinela, José; Stojković, Dejan; Soković, Marina; Zied, Diego Cunha; Cobos, Juan Diego Valenzuela; González-Paramás, Ana María; Ferreira, Isabel C.F.R.; Barros, LillianSupplementation of the substrate of mushrooms with calcium silicate and other minerals is usually used as a preventive measure against pests and other contaminants during the production of oyster mushrooms. Little is known of the effects of this supplementation on the quality of the mushrooms produced. In the work described herein, the supplementation of oyster mushrooms was performed with 5 supplementation levels (0%, 0.5%, 1%, 2% and 4%) on mushrooms from two different locations in Brazil, the two flushes of mushrooms produced were analysed in terms of phenolic compounds, organic acids, and the antioxidant, antibacterial and antifungal activities, and finally the data was subjected to a linear discriminant analysis to understand the discrimination of the supplementation percentages. Overall, intermediate supplementation until 1% seemed to have a positive effect on the mushrooms from Mogi-das-Cruzes region, while high supplementation favoured the mushrooms from the region of Presidente Prudente. Supplementation showed positive effects on the mushrooms by increasing the production of some secondary metabolites while not showing any negative cytotoxic effects.
- Influence of calcium silicate on the chemical properties of pleurotus ostreatus var. Florida (Jacq.) P. KummPublication . Cardoso, Rossana V.C.; Carocho, Márcio; Fernandes, Ângela; Zied, Diego Cunha; Cobos, Juan Diego Valenzuela; González-Paramás, Ana María; Ferreira, Isabel C.F.R.; Barros, LillianSupplementation of mushroom substrates has been linked to a higher resistance against insect pests, although few studies show the impact of this supplementation on the different agronomical parameters of mushrooms or even their chemical composition. In this work, the variation in the biological and chemical composition of oyster mushroom (Pleurotus ostreatus var. florida (Jacq.) P. Kumm) was analysed after varying the substrate supplementation of calcium silicate (0, 0.5, 1, 2, and 4% (w/w%)) during two harvest flushes. Overall, supplementation did not change the weight, the number of fruiting bodies, biological efficiency, yield ratio, and productivity rate of the mushrooms, although the harvest flushes did show significant differences. Furthermore, slight changes were found in the chemical composition with an increase in vitamin D2 and tocopherols for the mushrooms with higher amounts of calcium silicate. Overall, the substrate supplementation did not seem to induce expressive changes or decrease production yields, and can, therefore, continue to be researched as a potential application to fight agronomical pests.