Table 2.

Extraction yields and radical scavenging percentages of several extracts prepared by the extraction procedures E1–E6 from the olive wood sample A.

Extracta	Procedureb	Solvent	Temperature	Yieldc	RSP ± SDd
A1	E1	EtOH	r.t.	54.1	48.8 ± 0.2
A2	E2	EtOAc	r.t.	11.0	63.2 ± 0.8
A3	E2	EtOH	r.t.	51.4	42.1 ± 0.4
A4	E3	EtOAc	Reflux	14.2	64.9 ± 0.1
A5	E4	EtOAc	r.t.	8.6	48.5 ± 0.8
A6	E4	EtOH	r.t.	40.0	42.1 ± 1.1
A7	E4	EtOH : H2O 3 : 2	r.t.	111.4	27.1 ± 1.9
A8	E4	H2O	r.t.	80.0	17.1 ± 1.4
A9	E4	H2O : HCOOH 4 : 1	r.t.	122.9	25.9 ± 0.5
A10	E4	EtOAc	Reflux	11.4	50.9 ± 1.5
A11	E4	EtOH	Reflux	94.3	52.4 ± 1.7
A12	E4	EtOH : H2O 3 : 2	Reflux	145.7	39.6 ± 1.1
A13	E4	H2O	Reflux	108.6	44.0 ± 0.2
A14	E4	H2O : HCOOH 4 : 1	Reflux	211.4	33.7 ± 1.8
A15	E5	EtOAc	Reflux	22.6	54.3 ± 0.3
A16	E5	n-BuOH	Reflux	54.9	45.7 ± 1.3
A17	E5	H2O	Reflux	42.0	11.1 ± 0.8
A18	E6	Et2O	Reflux	4.0	48.5 ± 0.1
A19	E6	CHCl3	Reflux	4.0	26.1 ± 0.4
A20	E6	n-BuOH	Reflux	33.7	39.6 ± 0.1
Rosemary oleoresin (reference extract)d					95.0 ± 0.3

^aExtracts A1–A20 were prepared from the olive wood sample A, collected in April, 2003 (during the pruning period) at the village of Fuensanta, Jaén province, Spain.

^bProcedures E1–E6 are detailed in Figures 1–6.

^cYield is expressed as grams of extract per kilogram of olive wood sample.

^dRadical scavenging percentage (RSP) is expressed as DPPH^• scavenging (%). Values are means of three replicates ± SD (standard deviation).

^dCommercially available rosemary extract was used as reference, at the same concentration (50 μg mL⁻¹).