Abstract
The emergence of medicine resistance strains of influenza
A viruses to the chemical drogs lead to the development of
alternative herbal compounds that inhibit the virus replication.
Therefore, the aim of this research was to investigate in vitro
anti-influenza A viruses activity, antioxidant potential, total
phenolic, and flavonoid content of a total of 12 hydro alcoholic
crude extracts obtained from 8 kinds of medicinal plants. Antiinfluenza
A viruses activity of the extracts was investigated by
the using of MDCK cell line and MTT (3-[4,5-dimethylthiazol–
2-yl]-2,5-diphenyltetrazolium bromide) method. Both
50% inhibitory concentration (IC50) and 50% cytotoxicity
concentration (CC50) of the extracts were identified using
regression analysis. The antioxidant activity, total phenol, and
flavonoid content of the extracts were determined using 2,
2-diphenyl-1-picrylhydrazyl (DPPH) assay, Folin-Ciocalteu
method, and aluminum chloride colorimetric method,
respectively. The results demonstrated that there was high
activity against influenza virus for Peganum harmala L.,
Equisetum arvense L., and Punica granatum L, extracts with IC50
value of 9.1 (CI95%:7.3-11.3), 6.45 (CI95%: 4.5-9.23), and 104.5
(CI95%: 82.8-131.8), respectively. DPPH radical scavenging
activity showed that both Equisetum arvense L. and Punica
granatum L. demonstrated the highest antioxidant activity with
IC50 value of 6.5, 6.8 and 7.7 μg/mL, respectively. According to
the results, some of these extracts might be further analyzed to
develop effective anti-influenza factors.