Local isolates of the Riau fungus Penicillium sp. LBKURCC34, Trichoderma asperellum LBKURCC1 and Trichoderma asperelloides LBKURCC2 are well-known potential producers of enzymes and secondary metabolites with antimicrobial activity. Several studies have shown that these secondary metabolites have potential as antioxidants. Co-culture fermentation is known to increase the structural diversity of…