Novel secoiridoids with antioxidant activity from Australian olive mill waste.
A new biophenolic secoiridoid was identified in Australian Frantoio olive mill waste (OMW) extracts. Isolation, purification, and structure elucidation were performed. Hydroxytyrosyl acyclodihydroelenolate, the first nonaldehydic acyclic secoiridoid, is reported. A second compound was identified as p-coumaroyl-6'-secologanoside (comselogoside), and although it has been identified recently in OMW and leaves, this is the first time it has been identified in both OMW and olive fruits. UV, mass spectral, and NMR data are given for both compounds. The two compounds were quantified by HPLC-DAD, and their antioxidant potential was assessed against the classical olive biophenols, hydroxytyrosol and oleuropein, by the in vitro DPPH radical scavenging assay.
Obied
Hassan K
HK
E. H. Graham Centre for Agricultural Innovation, School of Science and Technology, Charles Sturt University, Wagga Wagga, NSW 2678, Australia.
Karuso
Peter
P
Prenzler
Paul D
PD
Robards
Kevin
K
D000975:Antioxidants / Q000494:pharmacology; D005511:Food Handling; D005638:Fruit / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D039823:Iridoids / Q000032:analysis* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D031658:Olea / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
D000975:Antioxidants; D007220:Industrial Waste; D039823:Iridoids