Various amounts of volatile extracts (prepared by sequentially diluting the standard extract with dichloromethane)
and components (prepared by sequentially diluting the standard dichloromethane solution of authentic chemicals) were added
to a 2 mL dichloromethane solution of hexanal (3 mg/mL) containing 0.2 mg/mL undecane as a GC internal standard. The oxidation of the sample solution was initiated by heating at 60 °C for 10 min in a sealed vial and then stored at room temperature