Keywords: شاخص های نگهداری خطی; Volatile compounds; Waxy wheat flour; GC/MS; SPME; dry heating; HTFs; heat-treated flours; NH; normal hard; WH; waxy hard; SKCS; single kernel characterization system; SPME; solid-phase microextraction; GC/MS; gas chromatography-mass spectrometry; NIST;