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a Total ion chromatogram of margarine volatiles (1: 2,3 butandione, 2: 2,3 pentandione (internal standard), 3: dimethyl disulfide, 4: nonanal, 5: butanoic acid, 6: hexanoic acid, 7: octanoic acid, 8: γ-nonalactone, 9: δ-decalactone). Mass spectra of 2,3 butandione (b), 2,3 pentandione (c), dimethyl disulfide (d), nonanal (e), butanoic acid (f), hexanoic acid (g), octanoic acid (h), γ-nonalactone (i), δ-decalactone (j)
