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GC analysis of solid-phase microextraction sulfur components from the head space of vials containing cut onion leaf material. Peak 1, Dipropyl disulfide; peak 2, 1-propenyl propyl disulfide; peak 3, di-1-propenyl disulfide isomer 1; peak 4, di-1-propenyl disulfide isomer 2; peak 5, di-1-propenyl disulfide isomer 3; peak 6, syn-2-mercapto-3,4-dimethyl-2,3-dihydrothiophene; peak 7, anti-2-mercapto-3,4-dimethyl-2,3-dihydrothiophene.
