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In this study, antitermitic and antifungal activities of enantiopure linalool and linalool oxide (furanoid) in  L. umbellata  var.  membranacea  were evaluated with their racemates. Results of chiral analysis showed that linalool oxide in leaves dominated by ( R )-linalool and in twigs dominated by ( S )-linalool were (2 R ,5 R )- trans - and (2 R ,5 S )- cis -linalool oxide and (2 S ,5 S )- trans - and (2 S ,5 R )- cis -linalool oxide, respectively. All  rac -, ( R )-, and ( S )-linalool at highest concentration showed termiticidal and antifeedant activities against  Reticulitermes speratus . Antitermitic activities of linalool oxides differed depending on their stereostructures, and (2 R ,5 R )- trans -linalool oxide showed the strongest termiticidal activity. ( S )-linalool showed significantly stronger antifungal activity than that of  rac - and ( R )-linalool against  Penicillium citrinum  and  Chaetomium globosum . Racemate of  trans - and  cis -linalool oxide showed potent activity against  P. citrinum ,  Rhizopus oryzae,  and  C. globosum ; however, the activity decreased in isolated pure enantiomers. These results suggest that linalool and linalool oxide exhibit different antitermitic and antifungal properties.

Antitermitic and antifungal properties of enantiopure linalool and furanoid linalool oxide confirmed in Lindera umbellata var. membranacea