title: The antimicrobial activity of heyneanol A extracted from the root of Taiwanese wild grape.
abstract: OBJECTIVE
  To search for antimicrobial compounds against pathogenic bacteria from grape vines (Vitis spp.). To investigate the antimicrobial efficacy of active compounds towards methicillin-resistant Staphylococcus aureus (MRSA).
  
  
  RESULTS
  The root extracts of taiwanese wild grape (Vitis thunbergii var. taiwaniana) showed marked activities against Gram-positive bacteria using the disc diffusion method. After purification, the active compound 1 was confirmed as heyneanol A by mass spectroscopy and nuclear magnetic resonance. Heyneanol A showed an minimum inhibitory concentration (MIC) value of 2 microg ml(-1) towards MRSA and a value of 2 to 4 microg ml(-1) for Enterococcus faecium, S. aureus, Streptococcus agalactiae and Streptococcus pyogenes. In addition, the contents of heyneanol A were determined as 36 mg g(-1) in roots of taiwanese wild grape.
  
  
  CONCLUSIONS
  The root extracts of grapevines have good antimicrobial activities towards some strains of Gram-positive pathogens. Heyneanol A, the major antimicrobial compound, is especially active towards MRSA. In addition, the abundances of heyneanol A and other stilbenes in the roots of grapevines make it possible to produce natural antimicrobial compounds from this plant species.
  
  
  CONCLUSIONS
  This study reports for the first time the antimicrobial compounds in the root extracts of grapevines. The results will have clinical significance owing to their activities against MRSA.
authors.affiliation: Department of Horticulture, National Taiwan University, Taiwan.
authors.forename: S-C
authors.initials: SC
authors.lastname: Peng
authors.forename: C-Y
authors.initials: CY
authors.lastname: Cheng
authors.forename: F
authors.initials: F
authors.lastname: Sheu
authors.forename: C-H
authors.initials: CH
authors.lastname: Su
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis / Q000494:pharmacology*; D016984:Enterococcus faecium / Q000187:drug effects; D016106:Methicillin Resistance / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D010936:Plant Extracts / Q000494:pharmacology*; D018517:Plant Roots / Q000737:chemistry; D013211:Staphylococcus aureus / Q000187:drug effects; D013267:Stilbenes / Q000032:analysis / Q000494:pharmacology*; D013292:Streptococcus agalactiae / Q000187:drug effects; D013297:Streptococcus pyogenes / Q000187:drug effects; D013624:Taiwan; D027843:Vitis / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents; D010936:Plant Extracts; D013267:Stilbenes; C482862:heyneanol A