Baicalein, Ethyl Acetate, and Chloroform Extracts of Scutellaria baicalensis Inhibit the Neuraminidase Activity of Pandemic 2009 H1N1 and Seasonal Influenza A Viruses

Table 1

Inhibitory effects of MeOH, EtOAc, and chloroform extracts of S. baicalensis on NA enzymatic activity.

Extract	NA inhibition IC50 values (μg/mL)
	Seasonal 2007 H1N1	Pandemic 2009 H1N1	PR8 H1N1	Seasonal 2009 H1N1	Seasonal 2009 H3N2
MeOH	613.94 ± 5.54	>1000	>1000	875.92 ± 1.01	783.31 ± 0.23
EtOAc	73.17 ± 1.65	388.98 ± 0.93	487.40 ± 1.68	176.57 ± 0.32	306.96 ± 0.40
Chloroform	109.71 ± 3.08	562.94 ± 0.78	569.20 ± 0.52	251.29 ± 2.30	427.55 ± 0.59