861851.fig.001
Figure 1: Absorption spectra of bromhexine hydrochloride-dye complex extracted into 10 mL chloroform: (a) drug = 10 μg mL−1 + 5 mL of 0.025% BTB + 5 mL of pH2.8 buffer, (b) drug = 9 μg mL−1 + 5 mL of 0.025% BPB + 5 mL of pH2.5 buffer, and (c) drug = 9.5 μg mL−1 + 5 mL of 0.025% BCG + 5 mL of pH3.5 buffer.