|Table 3: Extraction yields and radical scavenging percentages of several extracts prepared by the extraction procedure E7 from the olive wood sample A.|
|Extracts A21–A44 were prepared from the olive wood sample A, collected in April, 2003 (during the pruning period) at the village of Fuensanta, Jaén province, Spain.|
The olive wood sample A was subjected to a hydrolysis pre-treatment with 0.5 M H2SO4 in H2O (extracts A21–A26), 0.5 M H2SO4 in H2O : EtOH (50 : 50, v/v) (extracts A27–A32), 1 M HCl in H2O (extracts A33–A38), and 1 M HCl in H2O : EtOH (50 : 50, v/v) (extracts A39–A44) (see Figure 7).
Time of the hydrolysis pre-treatment on the olive wood sample A at 130°C.
The hydrolysis pre-treatment of olive wood sample A afforded a liquid acidic extract and a solid pre-treated wood on which further extractions were performed (see Figure 7).
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).
Commercially available rosemary extract was used as reference, at the same concentration (50 g mL−1).