Fig. 6 below shows peak absorbance versus wavelength
of caffeine spectra extracted using dichloromethane from water solution at different stages. For comparison the
spectra of each stage were overlapped. It is clearly shown in
Fig. 6 that the concentration of caffeine at each stage is different,
hence the size of peak absorbance also varies. From
the results obtained high amount of caffeine concentration
was extracted in the first stage of extraction. Moreover as
seen from the graph almost no caffeine peak was seen in
the four rounds of extraction.