Abstract:
The pyrolysis products of ten different honeys were investigated by pyrolysis-cryo-trap(CIS)-gas chromatography-mass spectrometry(PY-CIS-GC/MS).In the nitrogen-oxygen mixture(vlume ratio of nitrogen and oxygen was 9∶ 91),the volatile pyrolysis products of ten honeys have been analyzed at 300,600℃,and 900℃ separately.The results showed that:① When the honey samples were pyrolized at 900,600℃ and 300℃,the same pyrolysis products and those pyrolysis products presenced in more than half of the honey samples were respectively:7 or 20 at 900℃,7 or 16 at 600℃,4 or 6 at 300℃.At the three pyrolysis temperatures,all the honey samples have the following four pyrolysis products:furfural,2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one,5-(hydroxymethyl)-2-furancarboxaldehyde,D-allose.The numbers and amounts of the pyrolysis products of honeys decreased with the decreasing of pyrolysis temperature.At each pyrolysis temperature,the main pyrolysis products and their contents have a little difference among the 10 honey samples.② At these three pyrolysis temperatures,the main pyrolysis products were aldehydes,ketones,saccharides,furans and pyrans.③ Several volatile constituents of the honeys transferred directly into pyrolysis products.④ The pyrolysis-cryo-trap(CIS)can trap on-line more completely.