title: Isolation and antimicrobial evaluation of isomeric hydroxy ketones in leaf cuticular waxes of Annona squamosa.
abstract: A novel natural compound, 11-hydroxy-16-hentriacontanone, has been isolated from the leaf cuticular wax of Annona squamosa along with its known isomer 10-hydroxy-16-hentriacontanone in a ratio of 67:33. This isomeric mixture of hydroxy ketones constituted together 16.5% of the total cuticular waxes. The new compound was characterised using spectral and chromatographic techniques. The major component was found to be 16-hentriacontanone (palmitone), which constituted up to 48% of the total cuticular wax, together with a homologous series of hydrocarbons, fatty aldehydes, fatty alcohols, fatty acids and sterols as minor components. The antimicrobial activity of the isomeric hydroxy ketones was tested against selected Gram-positive and Gram-negative bacterial strains, and also some selected fungal strains, and compared with palmitone. The antibacterial activity of palmitone was significantly higher than that of the isomeric hydroxy ketones, but their antifungal activities were comparable.
authors.affiliation: Lipid Science and Technology Division, Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 007, India.
authors.forename: K Shiva
authors.initials: KS
authors.lastname: Shanker
authors.forename: S
authors.initials: S
authors.lastname: Kanjilal
authors.forename: B V S K
authors.initials: BV
authors.lastname: Rao
authors.forename: K Hara
authors.initials: KH
authors.lastname: Kishore
authors.forename: S
authors.initials: S
authors.lastname: Misra
authors.forename: R B N
authors.initials: RB
authors.lastname: Prasad
mesh_terms: D031041:Annona / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000302:isolation & purification / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000302:isolation & purification* / Q000494:pharmacology*; D000935:Antifungal Agents / Q000302:isolation & purification / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D003470:Culture Media; D005658:Fungi / Q000187:drug effects; D008401:Gas Chromatography-Mass Spectrometry; D006838:Hydrocarbons / Q000032:analysis / Q000494:pharmacology; D007536:Isomerism; D007659:Ketones / Q000032:analysis / Q000302:isolation & purification* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D018515:Plant Leaves / Q000737:chemistry*; D014885:Waxes / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D003470:Culture Media; D006838:Hydrocarbons; D007659:Ketones; D014885:Waxes; C423862:palmitone