The Pleurotus eryngii koji-making conditions with Aspergillus oryzae was studied. Using protease, carboxymethyl cellulase and β-glucosidase activity as the indicator, the koji-making condition was optimized through single factor experiments and response surface methodology. Then the effect of with or without P. eryngii koji-making process on the content of amino acid nitrogen and hydroxyl radical scavenging ability of P. eryngiisoybean paste was tested. The results showed that the optimal conditions for P. ...