African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5210

Full Length Research Paper

Inhibition of Inula cappa (Ham. ex D. Don) DC. extracts on herpes simplex virus infection in vitro

  Jiraporn Nikomtat1,3, Puttinan Meepowpan2 and Yingmanee Tragoolpua1* 
  1Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200 Thailand.  2Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200 Thailand.  3Department of Science, Faculty of Science and Technology, Uttaradit Rajabhat University, Uttaradit, 53000, Thailand. 
Email: [email protected]

  •  Accepted: 28 September 2011
  •  Published: 30 October 2011



The methanol and dichloromethane extracts of Inula cappa (Ham. ex D. Don) DC. were evaluated for 
inhibition of herpes simplex virus infection. Higher anti- herpes simplex virus (HSV) activity of I. cappa 
methanol extract was observed comparing with I. cappa dichloromethane extract since more than 50% 
of the virus was inhibited by I. cappa methanol extract and 50% effective doses of I. cappa methanol 
extract on HSV-1and HSV-2 were 720.1±32.7 and 529.2±5.2 µg/ml respectively. However, when the virus 
particles were treated with I. cappa dichloromethane and I. cappa methanol extracts, both HSV-1 and 
HSV-2 particles were directly inactivated to negligible amount within 1 - 2 h. More than 50% interference 
on blocking of HSV attachment and penetration was observed after treatment the virus with I. cappa 
methanol extract. Moreover, within 30 h, the effective inhibitory activity of I. cappa methanol extract on 
HSV replication was higher than that of the I. cappa dichloromethane extract. Both extracts had potent 
activities in reducing viral deoxyribonucleic acid (DNA) synthesis since HSV DNA after treatment with 
the extracts were 1.3-2 fold less than HSV DNA control after determination by real time polymerase 
chain reaction and approximately 45 kilodalton viral proteins were clearly diminished after treatment 
with I. cappa methanol extract. Therefore, methanol extract of I. cappa is a potent inhibitor of herpes 
simplex virus infection in vitro. 
Key words: Anti-viral activity, Inula cappa, plant extract, herpes simplex virus.