In vitro anti-coxsackievirus B3 effect of ethyl acetate extract of Tian-hua-fen

Table 3 Protective effect of ethyl acetate extract on HeLa cells shown in percentage (A₆₀₀ value of cells protected with the extract/ A₆₀₀ value of normal HeLa cells

Dilution	1:256	1:512	1:1024	1:2048	1:4096	1:8192	10-5 CVB3m
The ratio of A600	88.56 ± 0.032	79.46 ± 0.008	73.07 ± 0.057	65.57 ± 0.023	61.83 ± 0.038	56.1 ± 0.015	16.7 ± 0.027

The percentage of vital cells protected with the extract accounted for compared with normal HeLa cells decreased with the in-creased extract dilution, and it was preferable from concentration 1 : 256 mg/mL to 1:1 024 mg/mL. ^bP < 0.01 vs group of 10^-5 CVB_3m.