After the coffee husk analyses, Se concentration of mushrooms
cultivated in the presence and absence of this element were
determined. The selenium content in P. ostreatus mushrooms
grown in coffee husk without Se enrichment ranged from 0.12 to
0.96 mg kg1 (Fig. 3); these levels can be considered low compared
to other mushrooms found in natural conditions (Huerta, Sánchez,
& Sanz-Medel, 2005). This result is also an evidence of the low Se
concentration in coffee husk (0.19 mg kg1) (Table 2).