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. 2014 Jan 23;9(1):e86606. doi: 10.1371/journal.pone.0086606

Figure 2. The absorbance conversion of HGA and alkaptonuric urine after addition of NaOH.

Figure 2

The absorption spectra of 0.04% HGA solution (A) and the urine samples from Case #1 (B) and Case #2 (C) of alkaptonuria incubated with NaOH at room temperature for each of the indicated durations (1 min, 10 min, 30 min, and 60 min).