The biological (antiviral) activity of a dried purified extract of Stevia was evaluated in vitro. Tests were performed using Teschen disease virus, infectious rhinotracheitis virus, and human coronavirus.

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Oligo(hexamethyleneguanidine) (OHMG) hydrochloride samples with various molecular weights that were synthesized from hexamethylenediamine and guanidine hydrochloride were characterized by 13 C NMR, ultracentrifugation, and capillary viscosimetry techniques. It was found that OHMG hydrochloride has 0.16 -1.08 branching points per molecule. Number-average molecular weights M n and weight-average molecular weights M w were calculated from 13 C NMR and ultracentrifugation data. A comparative analysis of these characteristics shows that the synthesized oligomers have a wide molecular-weight distribution (M w /M n = 5.4 -9.3).