While in the analysis of (D, L)-lactic acid, the (L)-phenylalaninamide and CuSO4· 5H2O (3 mmol L−1) were dissolved in methanol/water solution with different pH values. The flow rate was 0.5mL min-1 and the UV wavelength was at 254 nm.
While in the analysis of (D, L)-lactic acid, the (L)-phenylalaninamide and CuSO4·5H2O (3 mmol L−1) were dissolved in methanol/water solution withdifferent pH values. The flow rate was 0.5mL min-1 and the UVwavelength was at 254 nm.