Table 4: Extraction yields and radical scavenging percentages of several extracts prepared by the extraction procedures E3 and E4 from olive wood samples A, B, C, and D.

Olive wood sampleaExtractaProcedurebSolventYieldcRSP ± SDd

AA4E3EtOAc14.264.9 ± 0.1
BB1E3EtOAc46.863.7 ± 1.3
CC1E3EtOAc91.859.1 ± 2.6
DD1E3EtOAc14.240.5 ± 0.7

AA11E4EtOH94.352.4 ± 1.7
BB2E4EtOH117.338.3 ± 2.6
CC2E4EtOH172.542.4 ± 0.6
DD2E4EtOH81.742.9 ± 2.2

Rosemary oleoresin (reference extract)e95.0 ± 0.3

Extracts were prepared from (a) the olive wood sample A, collected in April, 2003 (during the pruning period) at the village of Fuensanta, Jaén province, Spain; (b) the olive wood sample B, collected in March, 2005 (during the pruning period) at the same location of sample A; (c) the olive wood sample C, collected in March, 2005 (during the pruning period) at the village of Mogón, Jaén province, Spain; (d) the olive wood sample D, collected in November, 2006 (during the harvesting season) at the same location of sample A.
Procedures E3 and E4 are detailed in Figures 3 and 4.
Yield is expressed as grams of extract per kilogram of olive wood sample.
Radical scavenging percentage (RSP) is expressed as DPPH scavenging (%). Values are means of three replicates ± SD (standard deviation).
eCommercially available rosemary extract was used as reference, at the same concentration (50  g mL−1).