Determination of 2-Propenal Using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography–Time-of-Flight Mass Spectrometry as a Marker for Authentication of Unrefined Sesame Oil

Table 4

Optimum levels for the experimental factors and predicted versus observed 2-propenal peak area.

Samples	Optimum conditions			D-optimal	Peak area of 2-propenal (a.u)
	(°C)	(min)	(min)		Predicted	Observed
Corn oil	55	15	15	0.9814	403478	416882
Soybean oil	55	25	15	1.000	1113987	1008313

significant difference between predicted and observed 2-propenal peak area verified by two-sample -test, < 0.05 ( = 3).