In the initial virus studies, glycerin extracts of plants were
used and the amounts adjusted from weight per volume
input. The glycerin procedure enriched for anthraquinones
present in the plants. The results shown in Table 1 reflect the
differences in anthraquinone concentrations present in the
extracts as measured by the differences in virucidal effects of
the extracts against HSV-1. The aloe extract sample was
also used to determine the effects of dose, time, and temperature
on the inactivation of HSV-1 (Fig. 1). Once anthraquinones
were identified as being the active component responsible
for these results, a chemically purified sample of aloe