“…A Bland–Altman analysis was conducted to evaluate the agreement between the methods. This involved plotting the mean values obtained from both methods on the x-axis against their relative differences (expressed as the ratio of the difference to the mean) on the Y-axis [ 33 ]. This analysis facilitated the determination of the mean relative error and 95 % confidence interval, offering insights into the consistency and reliability of the UV/Vis-CM method compared to the standard HPLC approach.…”