caa a22 4500 463247914 CHVBK 20180405153331.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10086-006-0850-z doi (NATIONALLICENCE)springer-10.1007/s10086-006-0850-z Antioxidant activity of extracts from the wood and bark of Port Orford cedar [Elektronische Daten] [Heng Gao, Todd Shupe, Thomas Eberhardt, Chung Hse] Heartwood, sapwood, and inner and outer bark of Port Orford cedar were extracted with methanol, and the extracts evaluated for antioxidant activity. The total phenol content (TPC) of the extracts was determined by the Folin-Ciocalteu method and expressed as gallic acid equivalent (GAE). Butylated hydroxytoluene was used as a positive control in the free-radical-scavenging activity tests and ethylenediaminetetraacetic acid dihydrate disodium salt served as a positive control in the metal-chelating activity assay. All wood extracts showed significant freeradical-scavenging activity. In the radical-scavenging assay of 2,2-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (the ABTS assay), the inner bark extracts exhibited the strongest free-radical-scavenging activity. The 50% inhibitory concentrations (IC50) in the radical-scavenging assay against 1,1-diphenyl-2-picrylhydrazyl hydrate radical (DPPH) of the heartwood, sapwood, and inner and outer bark extracts were 64.77, 29.03, 10.31, 19.87 μg·ml−1, respectively. In the metal-chelating activity system, the sapwood extract demonstrated significant activity. The greatest TPC, 537.5 mg GAE/g dry extract, was detected in the inner bark. The lowest TPC of 136.9 mg GAE/g dry extract was observed in the heartwood dry extract. The results indicate that the antioxidant activities of the extracts are in accordance with the amounts of phenolics present; the inner and outer barks of Port Orford cedar are rich in phenolics and may provide good sources of antioxidants. The Japan Wood Research Society, 2007 Free radical scavenger nationallicence Methanol extracts nationallicence Port Orford cedar nationallicence Total phenol content nationallicence Gao Heng Louisiana Forest Products Development Center, School of Renewable of Natural Resources, Louisiana State University AgCenter, 70803, Baton Rouge, LA, USA aut Shupe Todd Louisiana Forest Products Development Center, School of Renewable of Natural Resources, Louisiana State University AgCenter, 70803, Baton Rouge, LA, USA aut Eberhardt Thomas USDA Forest Service, Southern Research Station, 71360, Pineville, LA, USA aut Hse Chung USDA Forest Service, Southern Research Station, 71360, Pineville, LA, USA aut Journal of Wood Science Springer-Verlag 53/2(2007-04-01), 147-152 1435-0211 53:2<147 2007 53 10086 https://doi.org/10.1007/s10086-006-0850-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10086-006-0850-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gao Heng Louisiana Forest Products Development Center, School of Renewable of Natural Resources, Louisiana State University AgCenter, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Shupe Todd Louisiana Forest Products Development Center, School of Renewable of Natural Resources, Louisiana State University AgCenter, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Eberhardt Thomas USDA Forest Service, Southern Research Station, 71360, Pineville, LA, USA aut NATIONALLICENCE 700 1- Hse Chung USDA Forest Service, Southern Research Station, 71360, Pineville, LA, USA aut NATIONALLICENCE 773 0- Journal of Wood Science Springer-Verlag 53/2(2007-04-01), 147-152 1435-0211 53:2<147 2007 53 10086 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 379086042 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer