Supercritical fluid extracts of hazelnut seed coat were obtained using
solvents (methanol, ethanol and acetone) and methanol and ethanol con
taining sodium hydroxide (10%) catalyst. The yields of supercritical m
ethanol, ethanol and acetone extractions were 41.9, 52.3 and 60.9%, re
spectively, at 563 K. The yield of supercritical acetone extraction ha
s been increased from 44.0 to 60.9% as the temperature increased from
523 to 563 K. The yield of supercritical methanol extraction has been
increased from 41.9 to 60.0% in the catalytic run.