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Three bioactive fractions, extracellular laccase (ex-LAC), crude endopolysaccharides (c-EPL), and a low molecular subfraction of secondary metabolites (ex-LMS), were isolated from the idiophasic cultures of the white rot fungus  Cerrena unicolor . For the first time, we determined the antioxidant properties of these samples by chemiluminometric measurement (a) and assessment of the scavenging effect on ABTS (b) and the DPPH reduction rate (c). The highest reducing capability was found for the ex-LMS fraction: 39–90% for (a), 20–90% for (b), and 10–59% for (c) at the concentration of 6.25–800  µ g/mL. The scavenging abilities of the  C. unicolor  c-EPL were between 36 and 70% for (a), 2 and 60% for (b), and 28 and 32% for (c) at the concentration of 6.25–800  µ g/mL. A very high prooxidative potential was observed for the ex-LAC probes. The preliminary toxicity tests were done using the Microtox system and revealed the following percentage of the toxic effect against  Vibrio fischeri : 85.37% for c-EPL, 50.67% for ex-LAC, and 99.8% for ex-LMS, respectively. The ex-LAC sample showed the antibacterial activity against  Escherichia coli , c-EPL against  Staphylococcus aureus , and ex-LMS against both bacterial strains, respectively, but the stronger inhibitory effect was exerted on  S. aureus .

New Bioactive Fungal Molecules with High Antioxidant and Antimicrobial Capacity Isolated fromCerrena unicolorIdiophasic Cultures