Determination of Pyrolytic Products of Extract of Raisin by Py-GC-MS

50g of raisin were extracted twice by refluxing with 300 mL of 70% ethanol at 80 ℃ for 3 h. The extracts were filtered and the filtrate was evaporated to dryness under reduced pressure. The residue was treated with Pyroprobe 5200 at 400 ℃, 500 ℃, 600 ℃ and 800 ℃, the pyrolytic products obtained at each of the pyrolytic tempuratures were introduced into the instrument and analyzed by GC-MS. It was shown that the main pyrolytic products obtained were furfural, 2-furanmethanol, 5-methyl-2-furancarboxaldehyde, 5-hydroxymethyl-2-furancarboxaldehyde, and 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one. These pyrolysates are the important substances to make cigarettes to have distinctive fragrance and better taste.