When the FE concentration is 1, the amount of ferulic acid released reaches the maximum, and the FE concentration is further increased, reducing the amount of ferulic acid released.
When the Fe concentration was 1, the amount of ferulic acid released reached the maximum. Further increasing the Fe concentration reduced the amount of ferulic acid released
When the concentration of FE is 1, the amount of ferulic acid released reaches the maximum, which further increases the concentration of FE and reduces the amount of ferulic acid released.