nor did the
wavelength, indicating that also the proposed method is also
resistant to changes in standard conditions. The coefficients
of variation ranged from 0.66 to 2.37 for the herbal drugs, and
from 0.71 to 1.85 for the hydroethanol extract (Table 5), that
indicating the sources of variation in the study remained below
the prescribed maximum of 5% (Anvisa, 2003), confirming the
robustness of the method.